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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2011	Feb. 22, 2012	Jun. 30, 2011
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Entity Registrant Name	AKAMAI TECHNOLOGIES INC
Entity Central Index Key	0001086222
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 5,724,600,000
Entity Common Stock, Shares Outstanding		177,800,850

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 559,197	$ 231,866
Marketable securities (including restricted securities of $272 at December 31, 2010)	290,029	375,005
Accounts receivable, net of reserves of $4,555 and $5,232 at December 31, 2011 and 2010, respectively	210,936	175,366
Prepaid expenses and other current assets	55,414	48,029
Deferred income tax assets	6,444	28,201
Total current assets	1,122,020	858,467
Property and equipment, net	293,043	255,929
Marketable securities (including restricted securities of $42 and $45 at December 31, 2011 and 2010, respectively)	380,729	636,531
Goodwill	452,914	452,914
Other intangible assets, net	45,386	62,456
Deferred income tax assets	43,485	75,226
Other assets	7,924	11,153
Total assets	2,345,501	2,352,676
Current liabilities:
Accounts payable	38,247	26,375
Accrued expenses and other current liabilities	85,371	94,661
Deferred revenue	21,344	23,808
Accrued restructuring	3,430	307
Total current liabilities	148,392	145,151
Deferred revenue	2,470	3,642
Other liabilities	38,389	26,278
Total liabilities	189,251	175,071
Commitments, contingencies and guarantees (Note 11)
Stockholders' equity:
Preferred stock, $0.01 par value; 5,000,000 shares authorized; 700,000 shares designated as Series A Junior Participating Preferred Stock; no shares issued or outstanding	0	0
Common stock, $0.01 par value; 700,000,000 shares authorized; 195,561,243 shares issued and 177,504,624 shares outstanding at December 31, 2011; 192,383,121 shares issued and 186,603,380 shares outstanding at December 31, 2010	1,959	1,924
Additional paid-in capital	5,068,235	4,970,278
Treasury stock, at cost, 18,056,619 shares at December 31, 2011 and 5,779,741 shares at December 31, 2010	(482,994)	(158,261)
Accumulated other comprehensive loss	(1,259)	(5,741)
Accumulated deficit	(2,429,691)	(2,630,595)
Total stockholders' equity	2,156,250	2,177,605
Total liabilities and stockholders' equity	$ 2,345,501	$ 2,352,676

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Marketable securities, restricted securities	$ 0	$ 272
Accounts receivable, net of reserves	4,555	5,232
Marketable securities, restricted securities	$ 42	$ 45
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares designated as Series A Junior Participating Preferred Stock	700,000	700,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	700,000,000	700,000,000
Common stock, shares issued	195,561,243	192,383,121
Common stock, shares outstanding	177,504,624	186,603,380
Treasury stock, shares	18,056,619	5,779,741

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues	$ 1,158,538	$ 1,023,586	$ 859,773
Costs and operating expenses:
Cost of revenues	374,543	303,403	249,938
Research and development	52,333	54,766	43,658
Sales and marketing	227,331	226,704	179,421
General and administrative	191,726	167,779	146,100
Amortization of other intangible assets	17,070	16,657	16,722
Restructuring charge	4,886	0	454
Total costs and operating expenses	867,889	769,309	636,293
Income from operations	290,649	254,277	223,480
Interest income	10,670	12,163	15,643
Interest expense	0	1,697	2,839
Other income (expense), net	(6,125)	2,468	(163)
(Loss) gain on investments, net	(249)	396	785
Loss on early extinguishment of debt	0	(299)	0
Income before provision for income taxes	307,195	262,372	237,232
Provision for income taxes	106,291	91,152	91,319
Net income	$ 200,904	$ 171,220	$ 145,913
Net income per weighted average share:
Basic	$ 1.09	$ 0.97	$ 0.85
Diluted	$ 1.07	$ 0.90	$ 0.78
Shares used in per share calculations:
Basic	183,866	177,309	171,425
Diluted	187,556	190,650	188,658

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net income	$ 200,904	$ 171,220	$ 145,913
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	167,878	143,242	122,494
Amortization of deferred financing costs	0	507	840
Share-based compensation expense	61,305	76,468	58,797
Provision for deferred income taxes, net	53,628	62,462	81,706
Provision for doubtful accounts	2,066	1,546	6,727
Excess tax benefits from stock-based compensation	(13,123)	(28,973)	(2,236)
Non-cash portion of loss on early extinguishment of debt	0	299	0
Non-cash portion of restructuring charge	412	0	0
Loss (gain) on investments and disposal of property and equipment, net	597	(428)	(391)
Gain on divesture of certain assets	0	0	(1,062)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(37,837)	(23,563)	(1,159)
Prepaid expenses and other current assets	(7,014)	(12,089)	(5,020)
Accounts payable, accrued expenses and other current liabilities	15,184	20,529	10,255
Deferred revenue	(3,721)	(9,454)	5,871
Accrued restructuring	3,572	(617)	(1,067)
Other non-current assets and liabilities	8,704	1,306	2,744
Net cash provided by operating activities	452,555	402,455	424,412
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(550)	(12,668)	(5,779)
Purchases of property and equipment	(140,218)	(159,276)	(80,918)
Capitalization of internal-use software costs	(42,644)	(32,769)	(27,229)
Purchases of short- and long-term marketable securities	(880,110)	(1,146,493)	(790,351)
Proceeds from sales and redemptions of short- and long-term marketable securities	701,313	691,227	403,559
Proceeds from maturities of short- and long-term marketable securities	532,910	324,606	141,544
Increase in other investments	0	(500)	0
Proceeds from the sale of property and equipment	150	176	93
Proceeds from divesture of certain assets	0	0	1,350
Decrease in restricted investments held for security deposits	272	338	233
Net cash provided by (used in) investing activities	171,123	(335,359)	(357,498)
Cash flows from financing activities:
Proceeds from the issuance of common stock under stock option and employee stock purchase plans	25,252	45,776	21,724
Excess tax benefits from stock-based compensation	13,123	28,973	2,236
Employee taxes paid related to net share settlement of equity awards	(8,393)	0	0
Repurchases of common stock	(324,070)	(92,425)	(66,497)
Net cash used in financing activities	(294,088)	(17,676)	(42,537)
Effects of exchange rate changes on cash and cash equivalents	(2,259)	1,141	854
Net increase in cash and cash equivalents	327,331	50,561	25,231
Cash and cash equivalents at beginning of year	231,866	181,305	156,074
Cash and cash equivalents at end of year	559,197	231,866	181,305
Supplemental disclosure of cash flow information:
Cash paid for interest	0	1,258	1,998
Cash paid for income taxes	45,578	26,200	20,989
Non-cash financing and investing activities:
Capitalization of stock-based compensation, net of impairments	7,473	7,818	6,280
Common stock issued upon conversion of 1% convertible senior notes	0	199,755	100
Common stock returned upon settlement of escrow claims related to prior business acquisitions	$ 0	$ (430)	$ (427)

Consolidated Statement Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Comprehensive Income [Member]
Balance, shares at Dec. 31, 2008		169,371,675
Balance, value at Dec. 31, 2008	$ 1,568,770	$ 1,694	$ 4,539,154	$ 0	$ (24,350)	$ (2,947,728)
Comprehensive income:
Net income	145,913					145,913	$ 145,913
Foreign currency translation adjustment	1,933				1,933		1,933
Change in unrealized gain (loss) on available-for-sale marketable securities, net of tax	11,735				11,735		11,735
Comprehensive income							159,581
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, shares		4,479,139
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, value	12,028	$ 45	11,983
Issuance of common stock under employee stock purchase plan, shares		727,449
Issuance of common stock under employee stock purchase plan, value	9,801	$ 7	9,794
Stock-based compensation	65,004		65,004
Common stock returned upon settlement of escrow claims related to prior business acquisitions, shares		(9,233)
Common stock returned upon settlement of escrow claims related to prior business acquisitions, value	(427)	$ 0	(427)
Tax benefits (shortfall) from stock-based award activity, net	(9,880)		(9,880)
Stock-based compensation from awards issued to non-employees for services rendered	46		46
Issuance of common stock upon conversion of 1% convertible senior notes, shares		6,472
Issuance of common stock upon conversion of 1% convertible senior notes, value	100	$ 0	100
Repurchases of common stock, shares		(3,327,146)
Repurchases of common stock, value	(66,301)			(66,301)
Balance, shares at Dec. 31, 2009		171,248,356
Balance, value at Dec. 31, 2009	1,738,722	$ 1,746	4,615,774	(66,301)	(10,682)	(2,801,815)
Comprehensive income:
Net income	171,220					171,220	171,220
Foreign currency translation adjustment	1,172				1,172		1,172
Change in unrealized gain (loss) on available-for-sale marketable securities, net of tax	3,769				3,769		3,769
Comprehensive income							176,161
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, shares		4,413,894
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, value	33,625	$ 44	33,581
Issuance of common stock under employee stock purchase plan, shares		474,242
Issuance of common stock under employee stock purchase plan, value	12,151	$ 5	12,146
Stock-based compensation	84,268		84,268
Common stock returned upon settlement of escrow claims related to prior business acquisitions, shares		(9,612)
Common stock returned upon settlement of escrow claims related to prior business acquisitions, value	(430)	$ 0	(430)
Tax benefits (shortfall) from stock-based award activity, net	25,303		25,303
Stock-based compensation from awards issued to non-employees for services rendered	10		10
Issuance of common stock upon conversion of 1% convertible senior notes, shares		12,929,095
Issuance of common stock upon conversion of 1% convertible senior notes, value	199,755	$ 129	199,626
Repurchases of common stock, shares		(2,452,595)
Repurchases of common stock, value	(91,960)			(91,960)
Balance, shares at Dec. 31, 2010		186,603,380
Balance, value at Dec. 31, 2010	2,177,605	$ 1,924	4,970,278	(158,261)	(5,741)	(2,630,595)
Comprehensive income:
Net income	200,904					200,904	200,904
Foreign currency translation adjustment	(3,553)				(3,553)		(3,553)
Change in unrealized gain (loss) on available-for-sale marketable securities, net of tax	8,035				8,035		8,035
Comprehensive income							$ 205,386
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, shares		2,686,726
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, value	4,203	$ 30	4,173
Issuance of common stock under employee stock purchase plan, shares		491,396
Issuance of common stock under employee stock purchase plan, value	12,656	$ 5	12,651
Stock-based compensation	69,260		69,260
Tax benefits (shortfall) from stock-based award activity, net	11,855		11,855
Stock-based compensation from awards issued to non-employees for services rendered	18		18
Repurchases of common stock, shares		(12,276,878)
Repurchases of common stock, value	(324,733)			(324,733)
Balance, shares at Dec. 31, 2011		177,504,624
Balance, value at Dec. 31, 2011	$ 2,156,250	$ 1,959	$ 5,068,235	$ (482,994)	$ (1,259)	$ (2,429,691)

Nature of Business and Basis of Presentation	12 Months Ended
Nature of Business and Basis of Presentation	Dec. 31, 2011
Nature of Business and Basis of Presentation [Abstract]
Nature of Business and Basis of Presentation	Nature of Business and Basis of Presentation: Akamai Technologies, Inc. (“Akamai” or the “Company”) provides content delivery and cloud infrastructure services for accelerating and improving the delivery of content and applications over the Internet. Akamai’s globally distributed platform comprises thousands of servers in hundreds of networks in approximately 80 countries. The Company was incorporated in Delaware in 1998 and is headquartered in Cambridge, Massachusetts. Akamai currently operates in one industry segment: providing services for accelerating and improving the delivery of content and applications over the Internet. The accompanying consolidated financial statements include the accounts of Akamai and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in the accompanying financial statements.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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+ Details

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies: Use of Estimates The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America. These principles require management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the amounts disclosed in the related notes to the consolidated financial statements. Actual results and outcomes may differ materially from management’s estimates, judgments and assumptions. Significant estimates, judgments and assumptions used in these financial statements include, but are not limited to, those related to revenues, accounts receivable and related reserves, valuation and impairment of investments and marketable securities, loss contingencies, useful lives and realizability of long-lived assets and goodwill, capitalized internal-use software costs, income and other tax reserves, and accounting for stock-based compensation. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. The effects of material revisions in estimates are reflected in the consolidated financial statements prospectively from the date of the change in estimate. Revenue Recognition The Company recognizes service revenue in accordance with the authoritative guidance for revenue recognition, including guidance on revenue arrangements with multiple deliverables. Revenue is recognized only when the price is fixed or determinable, persuasive evidence of an arrangement exists, the service is performed and collectability of the resulting receivable is reasonably assured. Akamai primarily derives revenues from the sale of services to customers executing contracts having terms of one year or longer. These contracts generally commit the customer to a minimum monthly, quarterly or annual level of usage and specify the rate at which the customer must pay for actual usage above the monthly, quarterly or annual minimum. For these services, Akamai recognizes the monthly minimum as revenue each month, provided that an enforceable contract has been signed by both parties, the service has been delivered to the customer, the fee for the service is fixed or determinable and collection is reasonably assured. Should a customer’s usage of Akamai services exceed the monthly, quarterly or annual minimum, Akamai recognizes revenue for such excess in the period of the usage. For annual or other non-monthly period revenue commitments, the Company recognizes revenue monthly based upon the customer’s actual usage each month of the commitment period and only recognizes any remaining committed amount for the applicable period in the last month thereof. The Company typically charges its customers an integration fee when the services are first activated. Integration fees are recorded as deferred revenue and recognized as revenue ratably over the estimated life of the customer arrangement. The Company also derives revenue from services sold as discrete, non-recurring events or based solely on usage. For these services, the Company recognizes revenue once the event or usage has occurred. When more than one element is contained in a revenue arrangement, the Company determines the fair value for each element in the arrangement based on vendor-specific objective evidence (“VSOE”) for each respective element, including any renewal rates for services contractually offered to the customer. For arrangements in which the Company is unable to establish VSOE, third-party evidence ("TPE") of the fair value of each element is determined based upon the price charged when the element is sold separately by another vendor. For arrangements in which the Company is unable to establish VSOE or TPE for each element, the Company uses the best estimate of selling price ("BESP") to determine the fair value of the separate deliverables. The Company allocates arrangement consideration across the multiple elements using the relative selling price method. At the inception of a customer contract for service, the Company makes an assessment as to that customer’s ability to pay for the services provided. The Company bases its assessment on a combination of factors, including the successful completion of a credit check or financial review, its collection experience with the customer and other forms of payment assurance. Upon the completion of these steps, the Company recognizes revenue monthly in accordance with its revenue recognition policy. If the Company subsequently determines that collection from the customer is not reasonably assured, the Company records an allowance for doubtful accounts and bad debt expense for all of that customer’s unpaid invoices and ceases recognizing revenue for continued services provided until cash is received from the customer. Changes in the Company’s estimates and judgments about whether collection is reasonably assured would change the timing of revenue or amount of bad debt expense that the Company recognizes. The Company also sells its services through a reseller channel. Assuming all other revenue recognition criteria are met, the Company recognizes revenue from reseller arrangements based on the reseller’s contracted non-refundable minimum purchase commitments over the term of the contract, plus amounts sold by the reseller to its customers in excess of the minimum commitments. Amounts attributable to this excess usage are recognized as revenue in the period in which the service is provided. From time to time, the Company enters into contracts to sell its services or license its technology to unrelated enterprises at or about the same time that it enters into contracts to purchase products or services from the same enterprise. If the Company concludes that these contracts were negotiated concurrently, the Company records as revenue only the net cash received from the vendor, unless the product or service received has a separate identifiable benefit, and the fair value of the vendor’s product or service can be established objectively. The Company may from time to time resell licenses or services of third parties. The Company records revenue for these transactions on a gross basis when the Company has risk of loss related to the amounts purchased from the third party and the Company adds value to the license or service, such as by providing maintenance or support for such license or service. If these conditions are present, the Company recognizes revenue when all other revenue recognition criteria are satisfied. Deferred revenue represents amounts billed to customers for which revenue has not been recognized. Deferred revenue primarily consists of the unearned portion of monthly billed service fees, prepayments made by customers for future periods, deferred integration and activation set-up fees and amounts billed under customer arrangements with extended payment terms. Cost of Revenues Cost of revenues consists primarily of fees paid to network providers for bandwidth and for housing servers in third-party network data centers, also known as co-location costs. Cost of revenues also includes network operation employee costs, network storage costs, cost of software licenses, depreciation of network equipment used to deliver the Company’s services, amortization of network-related internal-use software and costs for the production of live events. The Company enters into contracts for bandwidth with third-party network providers with terms typically ranging from several months to two years. These contracts generally commit Akamai to pay minimum monthly fees plus additional fees for bandwidth usage above the committed level. In some circumstances, Internet service providers (“ISPs”) make available to Akamai rack space for the Company’s servers and access to their bandwidth at discounted or no cost. In exchange, the ISP and its customers benefit by receiving content through a local Akamai server resulting in better content delivery. The Company does not consider these relationships to represent the culmination of an earnings process. Accordingly, the Company does not recognize as revenue the value to the ISPs associated with the use of Akamai’s servers, nor does the Company recognize as expense the value of the rack space and bandwidth received at discounted or no cost. Accounting for Stock-Based Compensation The Company recognizes compensation costs for all stock-based payment awards made to employees and directors based upon the awards’ grant-date fair value. The stock-based payment awards include employee stock options, restricted stock, restricted stock units, deferred stock units and employee stock purchases related to the Company’s employee stock purchase plan. For stock options, the Company has selected the Black-Scholes option-pricing model to determine the fair value of stock option awards. For stock options, restricted stock, restricted stock units and deferred stock units that contain only a service-based vesting feature, the Company recognizes compensation cost on a straight-line basis over the awards’ vesting periods. For awards with a performance condition-based vesting feature, the Company recognizes compensation cost on a graded-vesting basis over the awards’ expected vesting periods, commencing when achievement of the performance condition is deemed probable. In addition, for awards that vest and become exercisable only upon achievement of specified performance conditions, the Company makes judgments and estimates each quarter about the probability that such performance conditions will be met or achieved. Any changes to those estimates that the Company makes from time to time may have a significant impact on the stock-based compensation expense recorded and could materially impact the Company’s result of operations. Research and Development Costs and Capitalized Internal-Use Software Research and development costs consist primarily of payroll and related personnel costs for the design, development, deployment, testing, operation and enhancement of the Company’s services and network. Costs incurred in the development of the Company’s services are expensed as incurred, except certain software development costs eligible for capitalization. Costs incurred during the application development stage of internal-use software projects, such as those used in the Company’s network operations, are capitalized in accordance with the accounting guidance for costs of computer software developed for internal use. Capitalized costs include external consulting fees, payroll and payroll-related costs and stock-based compensation expense for employees in the Company’s development and information technology groups who are directly associated with, and who devote time to, the Company’s internal-use software projects during the application development stage. Capitalization begins when the planning stage is complete and the Company commits resources to the software project. Capitalization ceases when the software has been tested and is ready for its intended use. Amortization of the asset commences when the software is complete and placed in service. The Company amortizes completed internal-use software to cost of revenues over an estimated life of two years. Costs incurred during the planning, training and post-implementation stages of the software development life-cycle are expensed as incurred. Costs related to upgrades and enhancements of existing internal-use software that increase the functionality of the software are also capitalized. Fair Value of Financial Measurements The Company's assets and liabilities are re-measured and reported at fair value at each reporting period. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company has certain financial assets and liabilities recorded at fair value (principally cash equivalents and short- and long-term marketable securities) that have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the guidance. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in accessible active markets for identical assets or liabilities. Fair values determined by Level 2 inputs utilize data points that are observable, such as quoted prices, interest rates and yield curves. Fair values determined by Level 3 inputs are based on unobservable data points for the asset or liability. Concentrations of Credit Risk The amounts reflected in the consolidated balance sheets for accounts receivable, other current assets, accounts payable, accrued liabilities and other current liabilities approximate their fair values due to their short-term maturities. The Company maintains the majority of its cash, cash equivalents and marketable securities balances principally with major financial institutions that the Company believes to be of high credit standing. The Company believes that, as of December 31, 2011, its concentration of credit risk related to cash equivalents and marketable securities was not significant. Concentrations of credit risk with respect to accounts receivable are primarily limited to certain customers to which the Company makes substantial sales. The Company’s customer base consists of a large number of geographically dispersed customers diversified across several industries. To reduce risk, the Company routinely assesses the financial strength of its customers. Based on such assessments, the Company believes that its accounts receivable credit risk exposure is limited. For the years ended December 31, 2011, 2010 and 2009, no customer accounted for more than 10% of total revenues. As of December 31, 2011 and December 31, 2010, one customer had an account receivable balance greater than 10% of total accounts receivable. The Company believes that, as of December 31, 2011, its concentration of credit risk related to accounts receivable was not significant. Taxes The Company's provision for income taxes is comprised of a current and a deferred portion. The current income tax provision is calculated as the estimated taxes payable or refundable on tax returns for the current year. The deferred income tax provision is calculated for the estimated future tax effects attributable to temporary differences and carryforwards using expected tax rates in effect during the years in which the differences are expected to reverse or the carryforwards are expected to be realized. The Company currently has net deferred tax assets consisting of net operating loss (“NOL”) carryforwards, tax credit carryforwards and deductible temporary differences. Management periodically weighs the positive and negative evidence to determine if it is more likely than not that some or all of the deferred tax assets will be realized. The Company has recorded certain tax reserves to address potential exposures involving its income tax and sales and use tax positions. These potential tax liabilities result from the varying application of statutes, rules, regulations and interpretations by different taxing jurisdictions. The Company's estimate of the value of its tax reserves contains assumptions based on past experiences and judgments about the interpretation of statutes, rules and regulations by taxing jurisdictions. It is possible that the costs of the ultimate tax liability or benefit from these matters may be materially more or less than the amount that the Company estimated. Uncertainty in income taxes is recognized in the Company's financial statements under guidance that prescribes a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination. If the tax position is deemed more-likely-than-not to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. As of December 31, 2011 the Company had unrecognized tax benefits of $17.2 million, including accrued interest and penalties (see Note 18). The Company uses the modified prospective transition method for calculating the tax effects of stock-based compensation. Additionally, the Company uses the “long-form method,” as provided in the guidance for stock-based compensation to determine the pool of windfall tax benefits upon adoption of the guidance. The Company's accounting policy is to use the tax law ordering approach related to intra-period tax allocation for utilization of tax attributes. In addition, the Company has elected that only the direct effects of equity awards are considered in the calculation of windfalls or shortfalls. Foreign Currency Translation and Forward Currency Contracts The assets and liabilities of the Company's subsidiaries are translated at the applicable exchange rate as of the balance sheet date, and revenues and expenses are translated at an average rate over the period. Resulting currency translation adjustments are recorded as a component of accumulated other comprehensive income (loss), a separate component of stockholders’ equity. Gains and losses on inter-company and other non-functional currency transactions are recorded in other income (expense), net. For the years ended December 31, 2011, 2010 and 2009, the Company recorded net foreign currency losses of $1.9 million, $2.5 million and $1.7 million, respectively, in the consolidated statement of operations. Starting in 2011, the Company enters into short-term foreign currency forward contracts to offset foreign exchange gains and losses generated by the re-measurement of certain assets and liabilities recorded in non-functional currencies. Changes in the fair value of these derivatives, as well as re-measurement gains and losses, are recognized in current earnings in other income (expense), net. As of December 31, 2011, the fair value of the forward currency contracts and the underlying net loss for the year ended December 31, 2011 were deemed to be immaterial. The Company's foreign currency forward contracts include credit risk to the extent that its counterparties may be unable to meet the terms of the agreements. The Company minimizes counterparty credit (or repayment) risk by entering into transactions only with major financial institutions of investment grade credit rating. Cash, Cash Equivalents and Marketable Securities Cash and cash equivalents consist of cash held in bank deposit accounts and short-term, highly-liquid investments with remaining maturities of three months or less at the date of purchase. Total cash, cash equivalents and marketable securities were $1,230.0 million and $1,243.4 million at December 31, 2011 and 2010, respectively. Short-term marketable securities consist of corporate, government and other securities with remaining maturities of more than three months at the date of purchase and less than one year from the date of the balance sheet. Long-term marketable securities consist of corporate, government and other securities with maturities of more than one year from the date of the balance sheet. Short-term and long-term marketable securities include investments that are restricted as to use. The Company classifies most debt securities and equity securities with readily determinable market values as “available for sale” in accordance with the authoritative guidance for accounting for certain investments in debt and equity securities. These investments are classified as marketable securities on the consolidated balance sheet and are carried at fair market value, with unrealized gains and losses considered to be temporary in nature reported as accumulated other comprehensive income (loss), a separate component of stockholders’ equity. The Company reviews all investments for reductions in fair value that are other-than-temporary. When such reductions occur, the cost of the investment is adjusted to fair value through recording a loss on investments in the consolidated statement of operations. Gains and losses on investments are calculated on the basis of specific identification. Investments and marketable securities are considered to be impaired when a decline in fair value below cost basis is determined to be other-than-temporary. The Company periodically evaluates whether a decline in fair value below cost basis is other-than-temporary by considering available evidence regarding these investments including, among other factors: the duration of the period that, and extent to which, the fair value is less than cost basis, the financial health of and business outlook for the issuer, including industry and sector performance and operational and financing cash flow factors, overall market conditions and trends and Akamai’s intent and ability to retain its investment in the security for a period of time sufficient to allow for an anticipated recovery in market value. Once a decline in fair value is determined to be other-than-temporary, a write-down is recorded and a new cost basis in the security is established. Assessing the above factors involves inherent uncertainty. Write-downs, if recorded, could be materially different from the actual market performance of investments and marketable securities in the Company’s portfolio, if, among other things, relevant information related to its investments and marketable securities was not publicly available or other factors not considered by the Company would have been relevant to the determination of impairment. Included in the Company’s long-term marketable securities at December 31, 2010 were auction rate securities (“ARS”) that were primarily AAA-rated bonds, all of which were collateralized by federally guaranteed student loans. See Note 6 below for a discussion of the Company’s ARS holdings. Based upon authoritative guidance related to disclosures of fair value measurements that was adopted in early 2010, the Company discloses the gross presentation of activity within the Level 3 fair value measurement roll-forward and details of transfers in and out of Level 1 and 2 fair value measurements. The Company also discloses the level of disaggregation of fair value measurements and disclosures on inputs and valuation techniques. A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changed. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 is made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities between Level 1 and Level 2 of the fair value measurement hierarchy during the years ended December 31, 2011 and 2010. The Company’s commercial paper, U.S. government agency obligations and U.S. corporate debt securities are classified as Level 2 securities. The Company primarily relies on valuation pricing models, recent bid prices and broker quotes to determine the fair value of these securities. The valuation models for Level 2 assets are developed and maintained by third party pricing services and use a number of standard inputs to the valuation model, including benchmark yields, reported trades, broker/dealer quotes where the party is standing ready and able to transact, issuer spreads, benchmark securities, bids, offers and other reference data. The valuation model may prioritize these inputs differently at each balance sheet date for any given security based on market conditions. Not all of the standard inputs listed will be used each time in the valuation models. For each asset class, quantifiable inputs related to perceived market movements and sector news may be considered in addition to the standard inputs. Accounts Receivable and Related Reserves The Company’s accounts receivable balance includes unbilled amounts that represent revenues recorded for customers that are typically billed monthly in arrears. The Company records reserves against its accounts receivable balance. These reserves consist of allowances for doubtful accounts and reserves for cash-basis customers. Increases and decreases in the allowance for doubtful accounts are included as a component of general and administrative expenses. The Company’s reserve for cash-basis customers increases as services are provided to customers where collection is no longer assured. Increases to the reserve for cash-basis customers are recorded as reductions of revenues. The reserve decreases and revenue is recognized when and if cash payments are received. Estimates are used in determining these reserves and are based upon the Company’s review of outstanding balances on a customer-specific, account-by-account basis. The allowance for doubtful accounts is based upon a review of customer receivables from prior sales with collection issues where the Company no longer believes that the customer has the ability to pay for services previously provided. The Company also performs ongoing credit evaluations of its customers. If such an evaluation indicates that payment is no longer reasonably assured for services provided, any future services provided to that customer will result in the creation of a cash-basis reserve until the Company receives consistent payments. The Company does not have any off-balance sheet credit exposure related to its customers. Property and Equipment Property and equipment are recorded at cost, net of accumulated depreciation and amortization. Property and equipment generally includes purchases of items with a per-unit value greater than $1,000 and a useful life greater than one year. Depreciation and amortization are computed on a straight-line basis over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of related lease terms or their estimated useful lives. Property and equipment acquired under capital leases are depreciated over the shorter of the related lease terms or the estimated useful lives of the assets. The Company periodically reviews the estimated useful lives of property and equipment. Changes to the estimated useful lives are recorded prospectively from the date of the change. Upon retirement or sale, the cost of the assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is included in income from operations. Repairs and maintenance costs are expensed as incurred. Goodwill and Other Intangible Assets The Company tests goodwill for impairment on an annual basis or more frequently if events or changes in circumstances indicate that the asset might be impaired. The Company performed impairment tests of goodwill as of December 31, 2011 and 2010. These tests did not result in an impairment to goodwill. Other intangible assets consist of completed technologies, customer relationships, trademarks, non-compete agreements arising from acquisitions of businesses and acquired license rights. Purchased intangible assets, other than goodwill, are amortized over their estimated useful lives based upon the estimated economic value derived from the related intangible asset (see Note 3). Goodwill is carried at its historical cost. Valuation of Other Long-Lived Assets Long-lived assets are reviewed for impairment whenever events or changes in circumstances, such as service discontinuance, technological obsolescence, a significant decrease in the Company’s market capitalization, facility closures or work-force reductions, indicate that the carrying amount of the long-lived asset may not be recoverable. When such events occur, the Company compares the carrying amount of the asset to the undiscounted expected future cash flows related to the asset. If this comparison indicates that an impairment is present, the amount of the impairment is calculated as the difference between the carrying amount and the fair value of the asset. The Company did not have any indications of impairment for the years ended December 31, 2011, 2010 and 2009. Restructuring Charges A restructuring liability related to employee terminations is recorded by the Company when a one-time benefit arrangement is communicated to an employee who is involuntarily terminated as part of a reorganization and the amount of the termination benefit is known, provided that the employee is not required to render future services in order to receive the termination benefit. The Company records restructuring liabilities, discounted at the appropriate rate, for facility leases only when the space is both vacated and all actions needed to make the space readily available for sublease have been completed. The Company records restructuring liabilities for estimated costs to terminate a facility lease before the end of its contractual term or for estimated costs that will continue to be incurred under the lease for its remaining term where there is no economic benefit to the Company, net of an estimate of sublease income. Litigation The Company is currently involved in certain legal proceedings. The Company estimates the range of liability related to pending litigation where the amount and range of loss can be estimated. The Company records its best estimate of a loss when the loss is considered probable. Where a liability is probable and there is a range of estimated loss with no best estimate in the range, the Company records the minimum estimated liability related to the claim. As additional information becomes available, the Company reassesses the potential liability related to the Company’s pending litigation and revises its estimate. Advertising Expense The Company recognizes advertising expense as incurred. The Company recognized total advertising expense of $0.8 million, $0.5 million and $0.7 million for the years ended December 31, 2011, 2010 and 2009, respectively. Recent Accounting Pronouncements In December 2010, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update for business combinations specifically related to the disclosure of supplementary pro forma information for business combinations. This guidance specifies that pro forma disclosures should be reported as if the business combination that occurred during the current year had occurred as of the beginning of the comparable prior annual reporting period, and the pro forma disclosures must include a description of material, nonrecurring pro forma adjustments. This standard was effective for business combinations with an acquisition date of January 1, 2011 or later. The adoption of the guidance did not have an impact on the Company's financial position or results of operations. In May 2011, the FASB issued amended guidance and disclosure requirements for fair value measurements. This guidance provides a consistent definition of fair value and ensures that the fair value measurement and disclosure requirements are similar between generally accepted accounting principles in the United States of America and international financial reporting standards. The guidance changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. This standard will be effective for interim and annual periods beginning after December 15, 2011 and will be applied prospectively. The adoption of the guidance is not expected to have a material impact on the Company's consolidated financial statements. In June 2011, the FASB issued amended disclosure requirements for the presentation of comprehensive income. The amended guidance eliminates the option to present components of other comprehensive income (“OCI”) as part of the statement of changes in equity. Under the amended guidance, all changes in OCI are to be presented either in a single continuous statement of comprehensive income or in two separate but consecutive financial statements. The changes will be effective January 1, 2012 and early adoption is permitted. There will be no impact to the Company's consolidated financial results as the amendments relate only to changes in financial statement presentation. In September 2011, the FASB issued amended guidance that will simplify how entities test goodwill for impairment. Under the amended guidance, after assessment of certain qualitative factors, if it is determined to be more likely than not that the fair value of a reporting unit is less than its carrying amount, entities must perform the quantitative analysis of the goodwill impairment test. Otherwise, the quantitative test(s) are optional. The guidance is effective January 1, 2012 with early adoption permitted. The Company intends to adopt this guidance effective January 1, 2012. The adoption of the guidance is not expected to have a material impact on the Company's financial position or results of operations.

Business Acquisition	12 Months Ended
Business Acquisition	Dec. 31, 2011
Business Combinations [Abstract]
Business Acquisition	Business Acquisitions: In June 2010, the Company acquired substantially all of the assets and liabilities of Velocitude (“Velocitude”) in exchange for payment of approximately $12.0 million in cash. In addition, the Company recorded a liability of $2.4 million for contingent consideration related to the expected achievement of certain post-closing milestones. During the years ended December 31, 2011 and 2010, the Company paid $0.6 million and $0.7 million, respectively, related to the achivement of some of these milestones and decreased the fair value of the liability by $0.4 million and $0.7 million, respectively, which was recorded as a reduction to general and administrative expenses. The acquisition of the assets of Velocitude was intended to further Akamai’s strategic position in the mobile market and was accounted for using the purchase method of accounting. The Company allocated $11.6 million of the cost of the acquisition to goodwill and $2.8 million to other intangible assets. The consolidated financial statements include the operating results of the business from the date of acquisition. Pro forma results of operations for this acquisition have not been presented because the effects of the acquisition were not material to the Company’s consolidated financial results.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1383-128463

+ Details

Net Income per Share

12 Months Ended

Dec. 31, 2011

Earnings Per Share Reconciliation [Abstract]

Net Income per Share

Net Income per Share:

Basic net income per weighted average share is computed using the weighted average number of common shares outstanding during the applicable period. Diluted net income per weighted average share is computed using the weighted average number of common shares outstanding during the period, plus the dilutive effect of potential common stock. Potential common stock consists of shares issuable pursuant to stock options, deferred stock units, restricted stock units and convertible notes.

The following table sets forth the components used in the computation of basic and diluted net income per common share (in thousands, except per share data):



	For the Years Ended December 31,
	2011		2010		2009
Numerator:
Net income	$	200,904	$	171,220	$	145,913
Add back of interest expense on 1% convertible senior notes (net of tax)	—		1,059		1,746
Numerator for diluted net income per common share	$	200,904	$	172,279	$	147,659
Denominator:
Denominator for basic net income per common share	183,866		177,309		171,425
Effect of dilutive securities:
Stock options	2,550		3,821		2,805
Effect of escrow contingencies	—		254		342
Restricted stock units and deferred stock units	1,140		1,395		1,153
Assumed conversion of 1% convertible senior notes	—		7,871		12,933
Denominator for diluted net income per common share	187,556		190,650		188,658
Basic net income per common share	$	1.09	$	0.97	$	0.85
Diluted net income per common share	$	1.07	$	0.90	$	0.78

Outstanding options to acquire an aggregate of 2.8 million, 1.3 million and 3.1 million shares of common stock as of December 31, 2011, 2010 and 2009, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of these stock options were greater than the average market price of the Company’s common stock during the respective periods and the effect of including these stock options would be anti-dilutive. Additionally, 2.6 million, 3.2 million and 3.6 million shares of common stock issuable in respect of outstanding restricted stock units were excluded from the computation of diluted net income per share for the years ended December 31, 2011, 2010 and 2009, respectively, because the performance conditions had not been met as of those dates.

The calculation of assumed proceeds used to determine the diluted weighted average shares outstanding under the treasury stock method in the periods presented was adjusted by tax windfalls and shortfalls associated with all of the Company’s outstanding stock awards. Such windfalls and shortfalls are computed by comparing the tax deductible amount of outstanding stock awards to their grant-date fair values and multiplying the results by the applicable statutory tax rate. A positive result creates a windfall, which increases the assumed proceeds, and a negative result creates a shortfall, which reduces the assumed proceeds.

Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2011

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Comprehensive Income

Accumulated Other Comprehensive Loss:

Comprehensive income (loss) consists of net income and other comprehensive income (loss), which includes foreign currency translation adjustments and changes in unrealized gains and losses on marketable securities. For the purposes of comprehensive income disclosures, the Company does not record tax provisions or benefits for the net changes in the foreign currency translation adjustment, as the Company intends to permanently reinvest all undistributed earnings of its foreign subsidiaries. Accumulated other comprehensive income (loss) is reported as a component of stockholders’ equity and consisted of the following (in thousands):



	December 31,
	2011			2010
Net unrealized gain (loss) on investments, net of tax of $(14) at December 31, 2011 and $5,005 at December 31, 2010	$	191		$	(7,844	)
Foreign currency translation adjustments	(1,450		)	2,103
Accumulated other comprehensive loss	$	(1,259	)	$	(5,741	)

- Definition

The entire disclosure for comprehensive income. Includes, but is not limited to, the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14-26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e709-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e640-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e716-108580

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e689-108580

+ Details

Marketable Securities and Investments

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Marketable Securities and Investments

Marketable Securities and Investments:

The Company accounts for financial assets and liabilities in accordance with a fair value measurement accounting standard. The accounting standard provides a framework for measuring fair value under generally accepted accounting principles in the United States and requires expanded disclosures regarding fair value measurements. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting standard also establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 2 — Observable inputs, other than Level 1 prices, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities, including certain pricing models, discounted cash flow methodologies and similar techniques.

The following is a summary of marketable securities and other investment-related assets held at December 31, 2011 and 2010 (in thousands):



			Gross Unrealized					Aggregate Fair Value		Classified on Balance Sheet
										Short-term Marketable Securities		Long-term Marketable Securities
As of December 31, 2011	Cost		Gains		Losses					Short-term Marketable Securities		Long-term Marketable Securities
Available-for-sale securities:
Certificates of deposit	$	42	$	—	$	—		$	42	$	—	$	42
Corporate debt securities	524,515		873		(580		)	524,808		285,012		239,796
U.S. government agency obligations	145,995		78		(165		)	145,908		5,017		140,891
	$	670,552	$	951	$	(745	)	$	670,758	$	290,029	$	380,729
			Gross Unrealized					Aggregate Fair Value		Classified on Balance Sheet
										Short-term Marketable Securities		Long-term Marketable Securities
As of December 31, 2010	Cost		Gains		Losses					Short-term Marketable Securities		Long-term Marketable Securities
Available-for-sale securities:
Certificates of deposit	$	96	$	—	$	—		$	96	$	51	$	45
Commercial paper	59,912		34		(2		)	59,944		59,944		—
Corporate debt securities	651,855		1,416		(736		)	652,535		301,625		350,910
U.S. government agency obligations	161,722		102		(119		)	161,705		13,385		148,320
Auction rate securities	150,800		—		(13,544		)	137,256		—		137,256
	$	1,024,385	$	1,552	$	(14,401	)	$	1,011,536	$	375,005	$	636,531

Unrealized gains and unrealized temporary losses on investments classified as available-for-sale are included within

accumulated other comprehensive income (loss). Upon realization, those amounts are reclassified from accumulated other comprehensive income (loss) to gain (loss) on investments, net in the statement of operations. Realized gains and losses are reflected in the income statement as gain (loss) on investments, net. As of December 31, 2011, the Company did not hold any investment-related assets that have been in a continuous loss position for more than 12 months.

The following tables detail the fair value measurements within the fair value hierarchy of the Company’s financial assets, including investments and cash equivalents, at December 31, 2011 and 2010 (in thousands):



	Total Fair Value at December 31, 2011		Fair Value Measurements at Reporting Date Using
	Total Fair Value at December 31, 2011		Level 1		Level 2		Level 3
Money market funds	$	302,507	$	302,507	$	—	$	—
Certificates of deposit	42		42		—		—
Commercial paper	57,498		—		57,498		—
U.S. government agency obligations	145,908		—		145,908		—
Corporate debt securities	524,808		—		524,808		—
	$	1,030,763	$	302,549	$	728,214	$	—



	Total Fair Value at December 31, 2010		Fair Value Measurements at Reporting Date Using
	Total Fair Value at December 31, 2010		Level 1		Level 2		Level 3
Money market funds	$	55,648	$	55,648	$	—	$	—
Certificates of deposit	96		96		—		—
Commercial paper	59,944		—		59,944		—
U.S. government agency obligations	161,705		—		161,705		—
Corporate debt securities	652,535		—		652,535		—
Auction rate securities	137,256		—		—		137,256
	$	1,067,184	$	55,744	$	874,184	$	137,256

The following tables reflect the activity for the Company’s major classes of assets measured at fair value using Level 3 inputs for the years ended December 31, 2011 and 2010 (in thousands):



	Auction Rate Securities
Balance as of December 31, 2010	$	137,256
Redemptions and sales of securities	(137,256		)
Balance as of December 31, 2011	$	—



	Auction Rate Securities			Put Option related to Auction Rate Securities			Total
Balance as of December 31, 2009	$	244,505		$	9,614		$	254,119
Redemptions of securities	(124,100		)	—			(124,100		)
Unrealized gains included in accumulated other comprehensive income (loss), net	7,237			—			7,237
Realized gain on auction rate securities included in the statement of operations	9,614			—			9,614
Realized loss on other investment-related assets included in the statement of operations	—			(9,614		)	(9,614		)
Balance as of December 31, 2010	$	137,256		$	—		$	137,256

As of December 31, 2011, the Company grouped money market funds and certificates of deposit using a Level 1 valuation because market prices are readily available in active markets. As of December 31, 2011, the Company grouped commercial paper, U.S. government agency obligations and corporate debt securities using a Level 2 valuation because quoted prices for identical or similar assets are available in markets that are not active. As of December 31, 2011, the Company had no assets grouped using a Level 3 valuation.

Historically, the carrying value (par value) of the Company’s ARS holdings approximated fair market value due to the resetting of variable interest rates in a “Dutch auction” process. Beginning in mid-February 2008 and continuing throughout the period ended December 2011, however, the auctions for ARS held by the Company failed. As a result, the interest rates on ARS reset to the maximum rate per the applicable investment offering statements. The Company would not have been able to liquidate affected ARS until a future auction on these investments was successful, a buyer was found outside the auction process, the securities were called or refinanced by the issuer, or the securities matured. Due to these liquidity issues, the Company used a discounted cash flow analysis to determine the estimated fair value of these investments.

In November 2008, the Company entered into an agreement with one of its investment advisors, which required the advisor to repurchase at par value all outstanding ARS purchased through such advisor beginning on June 30, 2010. Such agreement created a separate financial instrument between the two companies (the “put option”). At any time during the period up until June 2010, the investment advisor had the right to call the ARS at par value, but did not do so. In early July 2010, the Company exercised the put option and $30.5 million of ARS were repurchased by the investment advisor at par value resulting in a gain recorded in the gain (loss) on investments, net in the consolidated statement of operations.

The Company elected to apply the fair value option, permissible under the accounting standard for the fair value option for financial assets and liabilities, to the put option. During the year ended December 31, 2010, the Company exercised the put option and as a result recorded a loss of $9.6 million, included in gain (loss) on investments, net in the consolidated statement of operations. As of December 31, 2010, the Company had estimated an aggregate loss of $13.5 million which was related to the impairment of ARS deemed to be temporary and included in accumulated other comprehensive income (loss) within stockholders’ equity. As of December 31, 2011 the Company no longer held any ARS.

As of December 31, 2010, the Company classified $137.3 million of ARS as long-term marketable securities on its consolidated balance sheet due to management’s estimate of its inability to liquidate these investments within the following twelve months. Contractual maturities of the Company’s marketable securities held at December 31, 2011 and 2010 are as follows:



	December 31,
	2011		2010
Available-for-sale securities:
Due in one year or less	$	290,029	$	375,005
Due after 1 year through 5 years	380,729		499,275
Due after 5 years	—		137,256
	$	670,758	$	1,011,536

For the year ended December 31, 2011, the Company recorded net losses on investments of $0.2 million. For the years ended December 31, 2010 and 2009, the Company recorded net gains on investments of $0.4 million and $0.8 million, respectively, on sales of marketable securities.

- Definition

Tabular disclosure of investments in certain debt and equity securities (and certain other trading assets) which include all debt and equity securities (other than those equity securities accounted for under the equity or cost methods of accounting) with readily determinable fair values. Other trading assets include assets that are carried on the balance sheet at fair value and held for trading purposes. A debt security represents a creditor relationship with an enterprise that is in the form of a security. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities (and other trading assets).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901
-Topic 320

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Equity Security
-URI http://asc.fasb.org/extlink&oid=6511694
-Topic 320

+ Details

Accounts Receivable

12 Months Ended

Dec. 31, 2011

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Accounts Receivable

Accounts Receivable:

Net accounts receivable consisted of the following (in thousands):



	December 31,
	2011			2010
Trade accounts receivable	$	142,166		$	116,212
Unbilled accounts	73,325			64,386
Gross accounts receivable	215,491			180,598
Allowance for doubtful accounts	(1,627		)	(1,329		)
Reserve for cash-basis customers	(2,928		)	(3,903		)
Total accounts receivable reserves	(4,555		)	(5,232		)
Accounts receivable, net	$	210,936		$	175,366

- Definition

The entire disclosure for claims held for amounts due a company. Examples include trade accounts receivables, notes receivables, loans receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph k

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5066-111524

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5162-111524

+ Details

Property and Equipment

12 Months Ended

Dec. 31, 2011

Property and Equipment [Abstract]

Property and Equipment

Property and Equipment:

Property and equipment consisted of the following (dollars in thousands):



	December 31,						Estimated Useful Lives in Years
	2011			2010			Estimated Useful Lives in Years
Computer and networking equipment	$	561,952		$	492,685		3
Purchased software	31,388			29,885			3
Furniture and fixtures	14,166			12,770			5
Office equipment	5,676			4,792			3
Leasehold improvements	36,358			29,914			2-12
Internal-use software	222,914			177,918			2
	872,454			747,964
Accumulated depreciation and amortization	(579,411		)	(492,035		)
	$	293,043		$	255,929

Depreciation and amortization expense on property and equipment and capitalized internal-use software for the years ended December 31, 2011, 2010 and 2009 were $150.8 million, $126.6 million and $105.8 million, respectively.

During the years ended December 31, 2011 and 2010, the Company wrote off $61.7 million and $14.9 million, respectively, of long-lived asset costs, with accumulated depreciation and amortization costs of $59.9 million and $14.5 million, respectively. These write-offs were primarily related to computer and networking equipment no longer in use.

During the years ended December 31, 2011, 2010 and 2009, the Company capitalized $42.6 million, $32.8 million and $27.2 million, respectively, of external consulting fees and payroll and payroll-related costs for the development and enhancement of internal-use software applications. Additionally, during the years ended December 31, 2011, 2010 and 2009, the Company capitalized $7.5 million, $7.8 million and $6.3 million, respectively, of non-cash stock-based compensation related to employees who developed and enhanced internal-use software applications. During the years ended December 31, 2011 and 2010, the Company wrote off $4.6 million and $2.3 million, respectively, of internal-use software costs, with accumulated amortization costs of $3.9 million and $2.3 million, respectively. Such internal-use software is used by the Company primarily to operate, manage and monitor its deployed network and deliver its services to customers.

The following table summarizes capitalized internal-use software costs (in thousands):



	December 31,
	2011			2010
Gross costs capitalized	$	230,938		$	181,376
Less: cumulative impairments	(8,024		)	(3,458		)
	222,914			177,918
Less: accumulated amortization, net of impairments	(152,140		)	(117,936		)
Net book value of capitalized internal-use software	$	70,774		$	59,982

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2011

Goodwill and Other Intangible Assets [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets:

The Company recorded goodwill and other intangible assets as a result of business acquisitions that occurred from 2000 through 2010. The Company also acquired license rights from the Massachusetts Institute of Technology in 1999. The changes in the carrying amount of goodwill for the years ended December 31, 2011 and 2010 were as follows (in thousands):



	Goodwill
Ending balance, December 31, 2009	$	441,347
Velocitude acquisition	11,567
Ending balance, December 31, 2010 and 2011	$	452,914

During 2010, the Company recorded goodwill of $11.6 million and acquired intangible assets of $2.8 million in connection with the acquisition of substantially all of the assets of Velocitude.

The Company reviews goodwill and other intangible assets for impairment annually or whenever events or changes in circumstances indicate that the carrying amount of these assets may exceed their fair value. The Company concluded that it had one reporting unit and assigned the entire balance of goodwill to that reporting unit as of December 31, 2011 and 2010 for purposes of performing an impairment test. The fair value of the reporting unit was determined using the Company’s market capitalization as of December 31, 2011 and 2010. The fair value on December 31, 2011 and 2010 exceeded the net assets of the reporting unit, including goodwill, as of both dates. Accordingly, the Company concluded that no impairment existed as of these dates. Unless changes in events or circumstances indicate that an impairment test is required, the Company will next test goodwill for impairment as of December 31, 2012.

Other intangible assets that are subject to amortization consist of the following (dollars in thousands):



	December 31, 2011
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization period in years
Completed technologies	$	36,731	$	(22,913	)	$	13,818	6
Customer relationships	88,700		(60,202		)	28,498		9
Non-compete agreements	8,340		(5,270		)	3,070		4
Trademarks and trade names	800		(800		)	—		4
Acquired license rights	490		(490		)	—		10
Total	$	135,061	$	(89,675	)	$	45,386



	December 31, 2010
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization period in years
Completed technologies	$	36,731	$	(16,520	)	$	20,211	6
Customer relationships	88,700		(50,832		)	37,868		9
Non-compete agreements	8,340		(4,070		)	4,270		4
Trademarks	800		(693		)	107		4
Acquired license rights	490		(490		)	—		10
Total	$	135,061	$	(72,605	)	$	62,456

Aggregate expense related to amortization of other intangible assets was $17.1 million for the year ended December 31, 2011 and $16.7 million for each of the years ended December 31, 2010 and 2009. As of December 31, 2011, amortization expense is expected to be approximately $16.6 million, $13.2 million, $7.2 million, $4.6 million and $2.1 million for the years ending December 31, 2012, 2013, 2014, 2015 and 2016, respectively.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2011

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accrued Expenses and Other Current Liabilities

Accrued Expenses and Other Current Liabilities:

Accrued expenses and other current liabilities consisted of the following (in thousands):



	December 31,
	2011		2010
Payroll and other related benefits	$	39,920	$	51,591
Bandwidth and co-location	29,291		21,787
Property, use and other taxes	9,923		15,849
Professional service fees	4,162		2,678
Contingent consideration	—		990
Other	2,075		1,766
Total	$	85,371	$	94,661

Commitments, Contingencies and Guarantees

12 Months Ended

Dec. 31, 2011

Commitments Contingencies and Guarantees [Abstract]

Commitments, Contingencies and Guarantees

Commitments, Contingencies and Guarantees:

Operating Lease Commitments

The Company leases its facilities under non-cancelable operating leases. These operating leases expire at various dates through December 2019 and generally require the payment of real estate taxes, insurance, maintenance and operating costs.

The minimum aggregate future obligations under non-cancelable leases as of December 31, 2011 were as follows (in thousands):




	Operating Leases
2012	$	23,360
2013	21,750
2014	20,544
2015	19,116
2016	14,343
Thereafter	39,644
Total	$	138,757

Rent expense for the years ended December 31, 2011, 2010 and 2009 was $23.0 million, $23.6 million and $19.8 million, respectively. The Company has entered into sublease agreements with tenants of various properties previously vacated by the Company. The amounts paid to the Company by these sublease tenants were approximately $0.8 million, $3.3 million and $1.6 million for the years ended December 31, 2011, 2010 and 2009, respectively.

As of December 31, 2011, the Company had outstanding letters of credit in the amount of $5.5 million related to certain of its real estate leases. The letters of credit expire as the Company fulfills its operating lease obligations. Certain of the Company’s facility leases include rent escalation clauses. The Company normalizes rent expense on a straight-line basis over the term of the lease for known changes in lease payments over the life of the lease. In the event that the landlord provided funding for leasehold improvements to leased facilities, the Company amortizes such amounts as part of rent expense on a straight-line basis over the life of the lease.

Purchase Commitments

The Company has long-term commitments for bandwidth usage and co-location with various networks and ISPs. For the years ending December 31, 2012, 2013, 2014 and 2015 the minimum commitments were, as of December 31, 2011, approximately $88.8 million, $12.8 million, $0.7 million and $0.1 million, respectively. Additionally, as of December 31, 2011, the Company had entered into purchase orders with various vendors for aggregate purchase commitments of $56.0 million, which are expected to be paid in 2012.

Litigation

Between July 2, 2001 and November 7, 2001, purported class action lawsuits seeking monetary damages were filed in the U.S. District Court for the Southern District of New York against the Company as well as against the underwriters of its October 28, 1999 initial public offering of common stock. The complaints were filed allegedly on behalf of persons who purchased the Company’s common stock during different time periods, all beginning on October 28, 1999 and ending on various dates. The complaints are similar and allege violations of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended, primarily based on the allegation that the underwriters received undisclosed compensation in connection with the Company’s initial public offering. On April 19, 2002, a single consolidated amended complaint was filed, reiterating in one pleading the allegations contained in the previously filed separate actions. The consolidated amended complaint defines the alleged class period as October 28, 1999 through December 6, 2000. A Special Litigation Committee of the Company’s Board of Directors authorized management to negotiate a settlement of the pending claims substantially consistent with a Memorandum of Understanding that was negotiated among class plaintiffs, all issuer defendants and their insurers. The parties negotiated a settlement that was subject to approval by the District Court. On February 15, 2005, the Court issued an Opinion and Order preliminarily approving the settlement, provided that the defendants and plaintiffs agree to a modification narrowing the scope of the bar order set forth in the original settlement agreement. On June 25, 2007, the District Court signed an order terminating the settlement. On August 25, 2009, the plaintiffs filed a motion for final approval of a new proposed settlement (among plaintiffs, the underwriter defendants, the issuer defendants and the insurers for the issuer defendants), plan of distribution of the settlement fund, and certification of the settlement classes. On October 5, 2009, the District Court issued an opinion and order granting plaintiffs’ motion for final approval of the settlement, approval of the plan of distribution of the settlement fund, and certification of the settlement classes. An order and final judgment was entered on November 4, 2009. All appeals were exhausted in January 2012, concluding this litigation with no liability to the Company.

On or about October 3, 2007, a purported Akamai shareholder filed a complaint in the U.S. District Court for the Western District of Washington, against the underwriters involved in its 1999 initial public offering of common stock, alleging violations of Section 16(b) of the Securities Exchange Act of 1934, as amended. The complaint alleges that the combined number of shares of the Company’s common stock beneficially owned by the lead underwriters and certain unnamed officers, directors and principal shareholders exceeded ten percent of its outstanding common stock from the date of the Company’s initial public offering on October 29, 1999, through at least October 28, 2000. The complaint further alleges that those entities and individuals were thus subject to the reporting requirements of Section 16(a) and the short-swing trading prohibition of Section 16(b) and failed to comply with those provisions. The complaint seeks to recover from the lead underwriters any “short-swing profits” obtained by them in violation of Section 16(b). Akamai was named as a nominal defendant in the action but has no liability for the asserted claims. None of the Company’s directors or officers serving in such capacities at the time of its initial public offering are currently named as defendants in this action, but there can be no guarantee that the complaint will not be amended or a new complaint or suit filed to name such directors or officers as defendants in this action or another action alleging a violation of the same provisions of the Securities Exchange Act of 1934, as amended. On March 12, 2009, the Court granted a joint motion by the Company and other issuer defendants to dismiss the complaint without prejudice on the grounds that the plaintiff had failed to make an adequate demand on the Company prior to filing her complaint. In its order, the Court stated it would not permit the plaintiff to amend her demand letters while pursuing her claims in the litigation. Because the Court dismissed the case on the grounds that it lacked subject matter jurisdiction, it did not specifically reach the issue of whether the plaintiff’s claims were barred by the applicable statute of limitations. However, the Court also granted a Joint Motion to Dismiss by the underwriter defendants in the action with respect to cases involving non-moving issuers, holding that the cases were barred by the applicable statute of limitations because the issuers’ shareholders had notice of the potential claims more than five years prior to filing suit. The plaintiff appealed. On December 2, 2010, the Ninth Circuit Court of Appeals affirmed the District Court’s decision to dismiss the moving issuers’ cases (including Akamai’s) on the grounds that plaintiff’s demand letters were insufficient to put the issuers on notice of the claims asserted against them and further ordered that the dismissals be made with prejudice. The Ninth Circuit, however, reversed and remanded the District Court’s decision on the underwriters’ motion to dismiss as to the claims arising from the non-moving issuers’ IPOs, finding plaintiff’s claims were not time-barred under the applicable statute of limitations. On January 18, 2011, the Ninth Circuit denied various parties’ petitions for rehearing and for rehearing en banc but stayed its rulings to allow for appeals to the United States Supreme Court. On April 15, 2011, underwriter defendants filed a Petition for Writ of Certiorari with the U.S. Supreme Court seeking reversal of the Ninth Circuit's decision relating to the statute of limitation issue. On June 27, 2011, the Supreme Court denied the plaintiff's petition regarding the demand issue and granted the underwriters' petition relating to the statute of limitations issue. The Supreme Court heard arguments on the latter issue in late 2011. The Company does not expect the results of this action to have a material adverse effect on its business, results of operations or financial condition. The Company has recorded no liability for this matter as of December 31, 2011.

The Company is party to various other litigation matters that management considers routine and incidental to its business. Management does not expect the results of any of these routine actions to have a material adverse effect on the Company’s business, results of operations or financial condition.

Guarantees

The Company has identified the guarantees described below as disclosable in accordance with the authoritative guidance for guarantor’s accounting and disclosure requirements for guarantees, including indirect guarantees of indebtedness of others. The Company evaluates estimated losses for guarantees under the guidance for accounting for contingencies. The Company considers such factors as the degree of probability of an unfavorable outcome and the ability to make a reasonable estimate of the amount of loss. To date, the Company has not encountered material costs as a result of such obligations and has not accrued any liabilities related to such guarantees in its financial statements.

As permitted under Delaware law, the Company’s Certificate of Incorporation provides that Akamai will indemnify each of its officers and directors during his or her lifetime for certain events or occurrences that happen by reason of the fact that the officer or director is or was or has agreed to serve as an officer or director of the Company. In addition, the Company has acquired other companies that were subject to similar director and officer indemnification provisions. The Company has generally become responsible for such indemnification obligations as a result of the acquisition. The maximum potential amount of future payments the Company could be required to make under these indemnification obligations is unlimited; however, the Company has director and officer insurance policies that limit its exposure and may enable the Company to recover a portion of certain future amounts paid. In the case of obligations assumed as a result of acquisitions, the Company may have the right to be indemnified by the selling stockholders of such acquired companies for director and officer indemnification expenses incurred by the Company for matters arising prior to the acquisition, which may eliminate or mitigate the impact of any such obligations.

The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to these agreements, the Company agrees to indemnify, hold harmless, and reimburse the indemnified party for losses suffered or incurred by the indemnified party, generally Akamai’s business partners or customers, in connection with Akamai’s provision of its services and software. Generally, these obligations are limited to claims relating to infringement of a patent, copyright or other intellectual property right or the Company’s negligence, willful misconduct or violation of law (provided that there is not gross negligence or willful misconduct on the part of the other party). Subject to applicable statutes of limitation, the term of these indemnification agreements is generally perpetual from the time of execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company carries insurance that covers certain third party claims relating to its services and could limit the Company’s exposure. There can, however, be no certainty that such insurance would cover a portion or any amount of such liability.

The Company has acquired all of the stock of numerous companies since 2000. As part of those acquisitions, the Company assumed the liability for undisclosed claims and losses previously incurred by such companies. Subject to applicable statutes of limitations, these obligations are generally perpetual from the date of acquisition. The maximum potential amount of future payments the Company could be required to make in connection with these obligations is unlimited. The Company may have the right to be indemnified by the selling stockholders of such acquired companies for losses and expenses incurred by the Company for matters arising prior to the acquisition, which may eliminate or mitigate the impact of any such obligations.

The Company leases space in certain buildings, including a corporate headquarters building, under operating leases. The Company has standard indemnification arrangements under such operating leases that require it to indemnify each landlord against losses, liabilities and claims incurred in connection with the premises covered by the Company's leases, its use of the premises, property damage or personal injury, and breach of the lease agreement, as well as occurrences arising from the Company’s negligence or willful misconduct. The Company also subleases certain space and agrees to indemnify the sublessee for losses caused by the Company’s employees on the premises. Subject to applicable statutes of limitation, the terms of these indemnification agreements are generally perpetual from the time of execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

The Company leases certain equipment under operating leases that require it to indemnify the lessor against losses, liabilities and claims in connection with the lease agreement, possession or use of the leased equipment, and in some cases certain tax issues. Subject to applicable statutes of limitation, the term of these indemnification agreements is generally perpetual from the time of execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

The Company licenses technology to certain third parties under license agreements that provide for Akamai to indemnify the third parties against claims of patent and copyright infringement. This indemnity generally does not apply in the event that the licensed technology has been modified by the third party or combined with other technology, hardware, or data that the Company has not approved. Subject to applicable statutes of limitation, the term of these indemnification agreements is generally perpetual from the time of execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

The Company licenses technology from third parties under agreements that contain standard indemnification provisions that require the Company to indemnify the third party against losses, liabilities and claims arising from the Company’s unauthorized use or modification of the licensed technology. Subject to applicable statutes of limitation, the term of these indemnification agreements is generally perpetual from the time of execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

Based upon the Company’s historical experience and information known as of December 31, 2011, the Company believes its liabilities related to the above guarantees and indemnifications are immaterial.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
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-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

1% Convertible Senior Notes	12 Months Ended
1% Convertible Senior Notes	Dec. 31, 2011
1% Convertible Senior Notes [Abstract]
Debt Disclosure [Text Block]	1% Convertible Senior Notes: In January 2004 and December 2003, Akamai issued $200.0 million in aggregate principal amount of 1% convertible senior notes due December 15, 2033 for aggregate proceeds of $194.1 million, net of an initial purchaser’s discount and offering expenses of $5.9 million. The initial conversion price of the 1% convertible senior notes was $15.45 per share (equivalent to 64.7249 shares of common stock per $1,000 principal amount of 1% convertible senior notes). During 2010, the Company issued 12,929,095 shares of common stock in connection with the conversion of $199.8 million in aggregate principal amount of the 1% convertible senior notes. As of December 31, 2010, the Company no longer had any 1% convertible senior notes outstanding. Deferred financing costs of $5.9 million, including the initial purchaser’s discount and other offering expenses, for the 1% convertible senior notes were amortized over the first 7 years of the term of the notes to reflect the put and call rights. Amortization of deferred financing costs of the 1% convertible senior notes was approximately $0.5 million for the year ended December 31, 2010 and $0.8 million for the year ended December 31, 2009. The Company records the amortization of deferred financing costs using the effective interest method as interest expense in the consolidated statement of operations.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Restructurings and Lease Terminations

12 Months Ended

Dec. 31, 2011

Restructuring and Related Activities [Abstract]

Restructuring and Lease Terminations

Restructurings and Lease Terminations:

In November 2008, the Company announced a workforce reduction of approximately 110 employees from all areas of the Company. The Company recorded $2.0 million as a restructuring charge for the amount of one-time benefits provided to affected employees. Included in these costs was a net reduction in non-cash stock-based compensation of $0.8 million, reflecting a modification to certain stock-based awards previously granted to the affected employees. Additionally, in December 2008, in connection with excess and vacated facilities under long-term non-cancelable leases, the Company recorded $0.5 million as a restructuring charge for the estimated future lease payments, less estimated sublease income, for these vacated facilities. The Company paid the remaining amounts in 2011.

In December 2011, the Company implemented a workforce reduction of approximately 70 employees from all areas of the Company. The Company recorded $4.2 million as a restructuring charge for the amount of one-time benefits to be provided to affected employees. Included in these costs was a net increase in non-cash stock-based compensation of $0.4 million reflecting a modification of certain stock-based awards previously granted to the affected employees. Additionally, during 2011, in connection with excess and vacated facilities under long-term non-cancelable leases, the Company recorded $0.7 million as a restructuring charge for the estimated future lease payments, less estimated sublease income, for these vacated facilities.

As of December 31, 2011 and 2010, the Company had $3.9 million and $0.3 million, respectively, of accrued restructuring liabilities. The restructuring liabilities will be fully paid through December 2019.

The following table summarizes the accrual and usage of the restructuring charges (in millions):



	Leases			Severance			Total
Ending balance, December 31, 2008	$	0.3		$	1.4		$	1.7
Restructuring charge	—			0.5			0.5
Cash payments	(0.2		)	(1.2		)	(1.4		)
Ending balance, December 31, 2009	0.1			0.7			0.8
Cash payments	(0.1		)	(0.4		)	(0.5		)
Ending balance, December 31, 2010	—			0.3			0.3
Restructuring charge	0.7			4.2			4.9
Cash Payments	(0.1		)	(1.2		)	(1.3		)
Ending balance, December 31, 2011	$	0.6		$	3.3		$	3.9
Current portion of accrued restructuring	$	0.1		$	3.3		$	3.4
Long-term portion of accrued restructuring	$	0.5		$	—		$	0.5

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Rights Plan and Series A Junior Participating Preferred Stock	12 Months Ended
	Dec. 31, 2011
Rights Plan and Series A Junior Participating Preferred Stock [Abstract]
Rights Plan and Series A Junior Participating Preferred Stock	Rights Plan and Series A Junior Participating Preferred Stock: On September 10, 2002, the Board of Directors of the Company (the “Board of Directors”) declared a dividend of one preferred stock purchase right for each outstanding share of the Company’s common stock held by stockholders of record at the close of business on September 23, 2002. To implement the rights plan, the Board of Directors designated 700,000 shares of the Company’s 5.0 million authorized shares of undesignated preferred stock as Series A Junior Participating Preferred Stock, par value $0.01 per share. Each right entitles the registered holder to purchase from the Company one one-thousandth of a share of preferred stock at a purchase price of $9.00 in cash, subject to adjustment. No shares of Series A Junior Participating Preferred Stock were outstanding as of December 31, 2011. In January 2004, the Board of Directors of the Company approved an amendment to the rights plan in which the purchase price of each right issued under the plan increased from $9.00 per share to $65.00 per share.

Stockholders' Equity Note	12 Months Ended
Stockholders' Equity Note	Dec. 31, 2011
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity: Holders of the Company’s common stock are entitled to one vote per share. At December 31, 2011, the Company had reserved approximately 8.2 million shares of common stock for future issuance of equity awards under its 2009 Stock Incentive Plan. See Note 16 for discussion of shares available for issuance under the Company’s 1999 Employee Stock Purchase Plan (the “1999 ESPP”). Stock Repurchase Program On April 29, 2009, the Company announced that its Board of Directors had authorized a stock repurchase program permitting purchases of up to $100.0 million of the Company’s common stock from time to time on the open market or in privately negotiated transactions. On April 28, 2010, the Company announced that its Board of Directors had authorized an extension of the stock repurchase program permitting purchases of an additional $150.0 million of the Company’s common stock from time to time over the next 12 months commencing in May 2010 on the open market or in privately negotiated transactions. The unused balance from the May 2010 extension was not carried forward for future purchases. On April 19, 2011, the Company’s Board of Directors authorized a new program authorizing up to an additional $150.0 million of repurchases over the next twelve months commencing in May 2011. On August 8, 2011, the Company's Board of Directors authorized an additional $250.0 million of stock repurchases over the twelve-month period that commenced in May 2011. As a result, the total authorized funding for stock repurchases increased to $400.0 million. The timing and amount of any shares repurchased will be determined by the Company’s management based on its evaluation of market conditions and other factors. Repurchases may also be made under a Rule 10b5-1 plan, which would permit the Company to repurchase shares when the Company might otherwise be precluded from doing so under insider trading laws. Subject to applicable securities laws, the Company may choose to suspend or discontinue the repurchase program at any time. During the years ended December 31, 2011 and 2010, the Company repurchased approximately 12.3 million and 2.5 million shares, respectively, of its common stock for $324.7 million and $92.0 million, respectively. As of December 31, 2011, the Company had $129.7 million remaining available for future purchases of shares under the approved repurchase program.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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-Name Accounting Standards Codification
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+ Details

Stock-Based Compensation

12 Months Ended

Dec. 31, 2011

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Stock-Based Compensation:

Equity Plans

In 1998, the Board of Directors adopted the Akamai Technologies, Inc. 1998 Stock Incentive Plan (the “1998 Plan”) for the issuance of incentive and nonqualified stock options, restricted stock awards and other types of equity awards. Options to purchase common stock and other equity awards could be granted at the discretion of the Board of Directors or a committee thereof. In December 2001, the Board of Directors adopted the Akamai Technologies, Inc. 2001 Stock Incentive Plan (the “2001 Plan”) for the issuance of nonqualified stock options, restricted stock awards and other types of equity awards. In March 2006, the Board of Directors adopted the Akamai Technologies, Inc. 2006 Stock Incentive Plan (the “2006 Plan”) for the issuance of incentive and nonqualified stock options, restricted stock awards, restricted stock units and other types of equity awards. In March 2009, the Board of Directors adopted the Akamai Technologies, Inc. 2009 Stock Incentive Plan (the “2009 Plan”) for the issuance of incentive and nonqualified stock options, restricted stock awards, restricted stock units and other types of equity awards. The total number of shares of common stock approved for issuance under the 1998 Plan, the 2001 Plan, the 2006 Plan and the 2009 Plan were 48.3 million, 5.0 million, 7.5 million and 8.5 million shares, respectively. Equity incentive awards may not be issued to the Company’s directors or executive officers under the 2001 Plan. In October 2005, the Board of Directors delegated to the Company’s Chief Executive Officer, acting as a committee of one Director, the authority to grant equity incentive awards to employees of the Company below the level of Vice President, subject to certain specified limitations, under all then-existing and future plans. The Company no longer issues equity awards under the 1998 Plan, the 2001 Plan or the 2006 Plan.

Under the terms of the 1998 Plan, the 2006 Plan and the 2009 Plan, the exercise price of incentive stock options may not be less than 100% (110% in certain cases) of the fair market value of the common stock on the date of grant. Incentive stock options could not be issued under the 2001 Plan. The exercise price of nonqualified stock options issued under the 1998 Plan, the 2001 Plan, the 2006 Plan and the 2009 Plan may be less than the fair market value of the common stock on the effective date of grant, as determined by the Board of Directors, but in no case may the exercise price be less than the statutory minimum. Stock option vesting typically occurs over four years under all of the plans, and options are granted at the discretion of the Board of Directors. Under the 1998 Plan and 2001 Plan, the term of options granted may not exceed ten years, or five years for incentive stock options granted to holders of more than 10% of the Company’s voting stock. Under the 2006 Plan and the 2009 Plan, the term of options granted may not exceed seven years.

The Company has assumed certain stock option plans and the outstanding stock options of companies that it has acquired (“Assumed Plans”). Stock options outstanding as of the date of acquisition under the Assumed Plans were exchanged for the Company’s stock options and adjusted to reflect the appropriate conversion ratio as specified by the applicable acquisition agreement, but are otherwise administered in accordance with the terms of the Assumed Plans. Stock options under the Assumed Plans generally vest over four years and expire ten years from the date of grant.

In August 1999, the Board of Directors adopted the 1999 ESPP. The Company reserved 3.1 million shares of common stock for issuance under the 1999 ESPP. In May 2002, the stockholders of the Company approved an amendment to the 1999 ESPP that allows for an automatic increase in the number of shares of common stock available under the 1999 ESPP each June 1 and December 1 to restore the number of shares available for issuance to 1.5 million, provided that the aggregate number of shares issued under the 1999 ESPP shall not exceed 20.0 million. The 1999 ESPP allows participants to purchase shares of common stock at a 15% discount from the fair market value of the stock as determined on specific dates at six-month intervals. During the years ended December 31, 2011, 2010 and 2009, the Company issued 0.5 million, 0.5 million and 0.7 million shares under the 1999 ESPP, respectively, with a weighted average purchase price per share of $25.75, $25.62 and $13.47, respectively. Total cash proceeds from the purchase of shares under the 1999 ESPP in 2011, 2010 and 2009 were $12.7 million, $12.2 million and $9.8 million, respectively. As of December 31, 2011, approximately $1.4 million had been withheld from employees for future purchases under the 1999 ESPP.

Stock-Based Compensation Expense

The following table summarizes the components of total stock-based compensation expense included in the Company’s consolidated statements of operations for the years ended December 31, 2011, 2010 and 2009 (in thousands):



	For the Years Ended December 31,
	2011			2010			2009
Stock-based compensation expense by type of award:
Stock options	$	13,533		$	15,154		$	17,636
Deferred stock units	1,885			1,885			2,085
Restricted stock units	47,807			62,928			41,584
Shares issued under the 1999 ESPP	5,553			4,319			3,772
Amounts capitalized as internal-use software	(7,473		)	(7,818		)	(6,280		)
Total stock-based compensation before income taxes	61,305			76,468			58,797
Less: Income tax benefit	(21,212		)	(26,566		)	(22,633		)
Total stock-based compensation, net of taxes	$	40,093		$	49,902		$	36,164
Effect of stock-based compensation on income by line item:
Cost of revenues	$	2,360		$	2,806		$	2,195
Research and development expense	11,125			14,539			10,967
Sales and marketing expense	27,990			35,525			27,411
General and administrative expense	19,830			23,598			18,224
Provision for income taxes	(21,212		)	(26,566		)	(22,633		)
Total cost related to stock-based compensation, net of taxes	$	40,093		$	49,902		$	36,164

In addition to the amounts of stock-based compensation reported in the table above, the Company’s consolidated statements of operations for the years ended December 31, 2011, 2010 and 2009 also included stock-based compensation reflected as a component of amortization of capitalized internal-use software; such additional stock-based compensation was $7.3 million, $7.5 million and $6.4 million, respectively, before tax.

Akamai has selected the Black-Scholes option pricing model to determine the fair value of the Company’s stock option awards. This model requires the input of subjective assumptions, including expected stock price volatility and estimated life of each award. The estimated fair value of Akamai’s stock-based awards, less expected forfeitures, is amortized over the awards’ vesting period on a straight-line basis. Expected volatilities are based on the Company’s historical stock price volatility and implied volatility from traded options in its stock. The Company uses historical data to estimate the expected life of options granted within the valuation model. The risk-free interest rate for periods commensurate with the expected life of the option is based on the United States Treasury yield rate in effect at the time of grant.

The grant-date fair values of Akamai’s stock option awards granted during the years ended December 31, 2011, 2010 and 2009 were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:



	For the Years Ended December 31,
	2011	2010	2009
Expected life (years)	4.2	4.2	4.1
Risk-free interest rate (%)	1.3	1.4	1.7
Expected volatility (%)	48.9	50.9	54.8
Dividend yield (%)	—	—	—

For the years ended December 31, 2011, 2010 and 2009, the weighted average fair value of Akamai’s stock option awards granted was $14.93 per share, $16.49 per share and $8.44 per share, respectively.

The grant-date fair values of Akamai’s ESPP awards granted during the years ended December 31, 2011, 2010 and 2009 were estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:



	For the Years Ended December 31,
	2011	2010	2009
Expected life (years)	0.5	0.5	0.5
Risk-free interest rate (%)	0.1	0.2	0.4
Expected volatility (%)	43.7	51.2	69.2
Dividend yield (%)	—	—	—

For the years ended December 31, 2011, 2010 and 2009, the weighted average fair value of Akamai’s ESPP awards granted was $10.24 per share, $9.86 per share and $4.11 per share, respectively.

As of December 31, 2011, total pre-tax unrecognized compensation cost for stock options, restricted stock units, deferred stock units and shares of common stock issued under the 1999 ESPP was $110.9 million. This non-cash expense will be recognized through 2015 over a weighted average period of 1.3 years. Nearly all of the Company’s employees have received grants through these equity compensation programs. Income tax benefits realized from the exercise of stock options and vesting of restricted stock units and deferred stock units during the years ended December 31, 2011, 2010 and 2009 were approximately $79.0 million, $123.5 million and $68.0 million, respectively.

Stock Options

The following table summarizes stock option activity during the years ended December 31, 2011, 2010 and 2009:



	Shares (in thousands)		Weighted Average Exercise Price
Outstanding at December 31, 2008	10,380		$	18.76
Granted	1,146		19.11
Exercised	(1,178	)	10.09
Forfeited and expired	(326	)	33.68
Outstanding at December 31, 2009	10,022		19.34
Granted	1,577		39.72
Exercised	(2,366	)	14.21
Forfeited and expired	(287	)	39.69
Outstanding at December 31, 2010	8,946		23.63
Granted	656		37.33
Exercised	(1,044	)	12.09
Forfeited and expired	(541	)	43.96
Outstanding at December 31, 2011	8,017		$	24.89
Exercisable at December 31, 2011	6,247		$	22.54

The total pre-tax intrinsic value of options exercised during the years ended December 31, 2011, 2010 and 2009 was $22.6 million, $67.5 million and $11.2 million, respectively. The total fair value of options vested, excluding capitalized stock-based compensation, for the years ended December 31, 2011, 2010 and 2009 was $14.8 million, $14.6 million and $18.2 million, respectively. Cash proceeds from the exercise of stock options were $12.6 million, $33.6 million and $11.9 million for the years ended December 31, 2011, 2010 and 2009, respectively.

The following table summarizes stock options that are outstanding and expected to vest and stock options exercisable at December 31, 2011:



Range of Exercise Price ($)	Options Outstanding and Expected to Vest						Options Exercisable
Range of Exercise Price ($)	Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value		Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value
	(In thousands)	(In years)			(In thousands)		(In thousands)	(In years)			(In thousands)
0.31-0.49	43	2.2	$	0.31	$	1,366	43	2.2	$	0.31	$	1,366
0.89-1.33	249	0.7	0.91		7,816		248	0.7	0.91		7,782
1.40-1.65	170	1.0	1.62		5,217		170	1.0	1.62		5,217
2.27-3.33	64	0.9	2.84		1,871		64	0.9	2.84		1,871
3.71-5.56	448	1.5	4.89		12,272		446	1.5	4.89		12,235
8.28-12.26	375	3.1	12.10		7,579		375	3.1	12.10		7,576
12.76-19.07	2,444	3.5	15.30		41,506		2,183	3.4	15.60		37,588
19.21-28.38	1,403	5.0	24.67		10,678		914	4.6	24.56		7,054
29.36-43.99	1,532	5.7	36.34		582		866	5.6	34.40		353
44.27-56.60	1,204	4.2	50.81		—		938	3.7	51.43		—
	7,932	4.0	24.74		$	88,887	6,247	3.5	22.54		$	81,042
Expected forfeitures	85
Total options outstanding	8,017

The aggregate intrinsic value in the preceding table represents the total pre-tax intrinsic value, based on Akamai’s closing stock price of $32.28 on December 31, 2011, that would have been received by the option holders had all option holders exercised their “in-the-money” options as of that date. The total number of shares issuable upon the exercise of “in-the-money” options exercisable as of December 31, 2011 was approximately 4.7 million.

Deferred Stock Units

The Company has granted deferred stock units (“DSUs”) to non-employee members of its Board of Directors and to the Company’s Chairman of the Board. Each DSU represents the right to receive one share of the Company’s common stock upon vesting. The holder may elect to defer receipt of the vested shares of stock represented by the DSU for a period for at least one year but not more than ten years from the grant date. The DSUs typically vest 50% upon the first anniversary of grant date, with the remaining 50% vesting in equal installments of 12.5% each quarter thereafter so that all DSUs are vested in full at the end of two years from date of grant. If a director has completed one year of Board service, vesting of 100% of the DSUs held by such director will accelerate at the time of his or her departure from the Board.

The following table summarizes the DSU activity for the years ended December 31, 2011, 2010 and 2009:



	Units (in thousands)		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2008	207		$	24.86
Granted	97		21.56
Vested and distributed	(17	)	33.07
Outstanding at December 31, 2009	287		21.04
Granted	47		39.95
Vested and distributed	(77	)	18.40
Outstanding at December 31, 2010	257		25.31
Granted	58		32.48
Vested and distributed	(15	)	33.78
Forfeited	(1	)	39.95
Outstanding at December 31, 2011	299		$	26.25

The total pre-tax intrinsic value of DSUs vested and distributed during the years ended December 31, 2011, 2010 and 2009 was $0.5 million, $3.0 million and $0.4 million, respectively. The total fair value of DSUs vested and distributed during the years ended December 31, 2011, 2010 and 2009 was $0.5 million, $1.4 million and $0.6 million, respectively. The grant-date fair value is calculated based upon the Company’s closing stock price on the date of grant. As of December 31, 2011, 68,583 DSUs were unvested, with an aggregate intrinsic value of approximately $2.2 million and a weighted average remaining contractual life of approximately 1.2 years. These units are expected to vest through May 2013.

Restricted Stock Units

The following table summarizes the different types of restricted stock units (“RSUs”) granted by the Company (in thousands):



	For the Years Ended December 31,
	2011	2010	2009
RSUs with service-based vesting conditions	3,003	1,597	2,342
RSUs with performance-based vesting conditions	550	1,124	1,974
Total	3,553	2,721	4,316

RSUs represent the right to receive one share of the Company’s common stock upon vesting. RSUs are granted at the discretion of the Board of Directors, a committee thereof or, subject to defined limitations, the Chief Executive Officer of the Company, acting as a committee of one Director, to whom such authority has been delegated. The Company has issued RSUs that vest based on the passage of time assuming continued service with the Company, as well as RSUs that vest only upon the achievement of defined performance metrics tied to corporate revenue and earnings per share targets.

For RSUs with service-based vesting conditions, the fair value was calculated based upon the Company’s closing stock price on the date of grant, and the stock-based compensation expense is being recognized over the vesting period. Most RSUs with service-based vesting provisions vest in installments over a three- or four-year period following the grant date.

For the years ended December 31, 2011, 2010 and 2009, management measured compensation expense for performance-based RSUs based upon a review of the Company’s expected achievement of specified performance targets. Such compensation cost is being recorded using a graded-vesting method for each series of grants of performance-based RSUs, to the extent management has deemed that such awards are probable of vesting based upon the expected achievement of the specified targets. Management will continue to review periodically the Company’s expected performance and adjust the compensation cost, if needed, at such time.

The following table summarizes the RSU activity for the years ended December 31, 2011, 2010 and 2009:



	Units (in thousands)		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2008	6,199		$	34.64
Granted	4,316		18.73
Vested	(3,282	)	28.20
Forfeited	(370	)	25.99
Outstanding at December 31, 2009	6,863		27.63
Granted	2,721		26.56
Vested	(1,971	)	23.97
Forfeited	(1,406	)	47.47
Outstanding at December 31, 2010	6,207		23.76
Granted	3,553		33.75
Vested	(1,931	)	23.15
Forfeited	(1,312	)	30.62
Outstanding at December 31, 2011	6,517		$	27.95

The total pre-tax intrinsic value of RSUs vested during the years ended December 31, 2011, 2010 and 2009 was $68.0 million, $72.0 million and $55.9 million, respectively. The total fair value of RSUs vested during the years ended December 31, 2011, 2010 and 2009 was $44.7 million, $47.2 million and $92.6 million, respectively. The grant-date fair value of each RSU is calculated based upon the Company’s closing stock price on the date of grant. As of December 31, 2011, 6.5 million RSUs were outstanding and unvested, with an aggregate intrinsic value of $181.9 million and a weighted average remaining contractual life of approximately 1.6 years. These RSUs are expected to vest on various dates through December 2015.

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References + Details

Employee Benefit Plan	12 Months Ended
Employee Benefit Plan	Dec. 31, 2011
Employee Benefit Plan [Abstract]
Employee Benefit Plan	Employee Benefit Plan: The Company has established a savings plan for its employees that is designed to be qualified under Section 401(k) of the Internal Revenue Code. Eligible employees are permitted to contribute to this plan through payroll deductions within statutory and plan limits. Participants may select from a variety of investment options. Investment options do not include Akamai common stock. Effective January 1, 2008, the Company amended its matching contribution to 1/2 of the first 8% of employee contributions in each year, with the maximum amount of the Company match at $2,000 per employee per year for the years 2009, 2010 and 2011. The Company’s contributions vest 25% per annum. The Company contributed approximately $3.4 million, $2.6 million and $1.9 million of cash to the savings plan for the years ended December 31, 2011, 2010 and 2009, respectively. Effective January 1, 2012, the Company amended its matching contribution to 1/2 of the first 8% of employee contributions in each year, with the maximum amount of the Company's match at $4,000 per employee per year. Additionally, effective February 1, 2012, the Company instituted immediate vesting of the Company's matching contributions.

Income Taxes

12 Months Ended

Dec. 31, 2011

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes:

The components of income before provision for income taxes were as follows (in thousands):



	For the Years Ended December 31,
	2011		2010		2009
Domestic	$	257,656	$	235,892	$	221,071
Foreign	49,539		26,480		16,161
Income before provision for income taxes	$	307,195	$	262,372	$	237,232

The provision for income taxes consisted of the following (in thousands):



	For the Years Ended December 31,
	2011			2010		2009
Current tax provision
Federal	$	39,517		$	19,619	$	1,393
State	2,953			4,993		4,229
Foreign	10,193			4,078		3,991
Deferred tax provision (benefit)
Federal	54,980			55,335		76,410
State	4,413			2,393		2,068
Foreign	1,209			4,269		3,238
Change in valuation allowance	(6,974		)	465		(10		)
	$	106,291		$	91,152	$	91,319

The Company’s effective rate differed from the statutory rate as follows:



	For the Years Ended December 31,
	2011		2010		2009
United States federal income tax rate	35.0	%	35.0	%	35.0	%
State taxes	2.8		2.9		3.7
Nondeductible stock-based compensation	0.8		0.1		1.2
United States federal and state research and development credits	(2.4	)	(2.6	)	(1.4	)
Change in state tax rates	(0.1	)	0.5		—
Foreign earnings	(2.2	)	(0.4	)	0.1
Expiration of capital loss carryforward	2.1		—		—
Other	0.9		(1.0	)	(0.1	)
Change in the deferred tax asset valuation allowance	(2.3	)	0.2		—
	34.6	%	34.7	%	38.5	%

The components of the net deferred tax asset and the related valuation allowance were as follows (in thousands):



	December 31,
	2011			2010
Net operating loss and credit carryforwards	$	9,323		$	35,202
Depreciation and amortization	30,702			60,935
Compensation costs	35,959			32,221
Impairment loss on marketable securities	—			5,005
Other	15,530			20,782
Deferred tax assets	91,514			154,145
Acquired intangible assets not deductible	(16,972		)	(22,784		)
Internal-use software capitalized	(24,165		)	(20,527		)
Impairment loss on marketable securities	(15		)	—
Deferred tax liabilities	(41,152		)	(43,311		)
Valuation allowance	(433		)	(7,407		)
Net deferred tax assets	$	49,929		$	103,427

As of December 31, 2011, the Company had utilized all of its United States federal NOL carryforwards that were held as of December 31, 2010. As of December 31, 2010, the Company had United States federal NOL carryforwards of approximately $8.8 million, and as of December 31, 2011 and 2010, the Company had state NOL carryforwards of approximately $51.4 million and $61.3 million, respectively, which expire at various dates through 2024. The Company also had foreign NOL carryforwards of approximately $0.7 million and $1.1 million as of December 31, 2011 and 2010, respectively. The majority of the foreign NOL carryforwards have no expiration dates. As of December 31, 2011 and 2010, the Company had United States federal and state research and development tax credit carryforwards of $6.5 million and $19.8 million, respectively, which will expire at various dates through 2026. As of each of December 31, 2011 and 2010, the Company had foreign tax credit carryforwards of $4.3 million, which will expire at various dates through 2020. As of December 31, 2011, the Company had utilized all of its alternative minimum tax credit carryforwards that were held as of December 31, 2010. As of December 31, 2010, the Company had alternative minimum tax credit carryforwards of $10.9 million. As of December 31, 2011 and 2010, the Company has recorded a valuation allowance on certain NOL and capital loss carryforwards for $0.4 million and $7.4 million, respectively.

As of December 31, 2011, unrepatriated earnings of non-U.S. subsidiaries totaled $82.9 million. No provision for U.S. income and foreign withholding taxes has been made for unrepatriated foreign earnings because it is expected that such earnings will be reinvested indefinitely. If these earnings were distributed to the United States in the form of dividends or otherwise, it would be included in the Company's U.S. taxable income. Determination of the amount of unrecognized deferred income tax liability related to these earnings is not practicable.

The following is a roll-forward of the Company’s unrecognized tax benefits (in millions):



	For the Years Ended December 31,
	2011			2010
Unrecognized tax benefits — at beginning of year	$	10.8		$	7.0
Gross increases — tax positions of prior periods	—			1.5
Gross increases — current-period tax positions	2.8			2.3
Gross decreases — tax positions of prior periods	(0.8		)	—
Gross decreases — settlements	(0.3		)	—
Unrecognized tax benefits — at end of year	$	12.5		$	10.8

As of December 31, 2011 and 2010, the Company had approximately $17.2 million and $15.1 million, respectively, of total unrecognized tax benefits, including $4.7 million and $4.3 million, respectively, of accrued interest and penalties. Interest and penalties related to unrecognized tax benefits are recorded in income tax expense. If recognized, all amounts of unrecognized tax benefits would have resulted in a reduction of income tax expense, impacting the effective income tax rate.

Generally, all tax years are open for examination by the major taxing jurisdictions to which the Company is subject including federal, state and foreign jurisdictions due to net operating losses and the limited number of prior year audits by taxing jurisdictions.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Segment and Geographic Information

12 Months Ended

Dec. 31, 2011

Segment Reporting [Abstract]

Segment and Geographic Information

Segment and Geographic Information:

Akamai’s chief decision-maker, as defined under the authoritative guidance for disclosures about segments of an enterprise and related information, is the Chief Executive Officer and the executive management team. As of December 31, 2011, Akamai operated in one industry segment: providing services for accelerating and improving the delivery of content and applications over the Internet. The Company is not organized by market and is managed and operated as one business. A single management team that reports to the Chief Executive Officer comprehensively manages the entire business. The Company does not operate any material separate lines of business or separate business entities with respect to its services. Accordingly, the Company does not accumulate discrete financial information with respect to separate product lines and does not have separately reportable segments as defined in the guidance.

The Company deploys its servers into networks worldwide. As of December 31, 2011, the Company had approximately $194.0 million and $99.0 million of property and equipment, net of accumulated depreciation, located in the United States and foreign locations, respectively. As of December 31, 2010, the Company had approximately $174.9 million and $81.0 million of property and equipment, net of accumulated depreciation, located in the United States and foreign locations, respectively.

Akamai sells its services and licenses through a sales force located both domestically and abroad. The following table summarizes the percentage of the Company's revenues derived from operations outside of the United States:



	For the Years Ended December 31,
	2011		2010		2009
Revenues from outside of the United States	29	%	28	%	28	%
Revenues derived from Europe	18	%	17	%	18	%

Other than the United States, no single country accounted for 10% or more of the Company’s total revenues for any reported period.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 34
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+ Details

Quarterly Financial Results (unaudited)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Results (unaudited) [Abstract]

Quarterly Financial Results (unaudited)

Quarterly Financial Results (unaudited):

The following table sets forth certain unaudited quarterly results of operations of the Company for the years ended December 31, 2011 and 2010. In the opinion of management, this information has been prepared on the same basis as the audited consolidated financial statements and all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts below for a fair statement of the quarterly information when read in conjunction with the audited consolidated financial statements and related notes.



	For the Three Months Ended
	March 31, 2011		June 30, 2011		Sept. 30, 2011		Dec. 31, 2011
	(In thousands, except per share data)
Revenues	$	275,953	$	276,989	$	281,856	$	323,740
Cost of revenues	$	89,068	$	89,647	$	93,284	$	102,544
Net income	$	50,617	$	47,921	$	42,285	$	60,081
Basic net income per share	$	0.27	$	0.26	$	0.23	$	0.34
Diluted net income per share	$	0.26	$	0.25	$	0.23	$	0.33
Basic weighted average common shares	186,849		186,612		183,085		178,916
Diluted weighted average common shares	191,383		190,179		185,704		182,956



	For the Three Months Ended
	March 31, 2010		June 30, 2010		Sept. 30, 2010		Dec. 31, 2010
	(In thousands, except per share data)
Revenues	$	240,029	$	245,318	$	253,551	$	284,688
Cost of revenues	$	67,474	$	71,840	$	77,812	$	86,277
Net income	$	40,878	$	38,123	$	39,709	$	52,510
Basic net income per share	$	0.24	$	0.22	$	0.22	$	0.29
Diluted net income per share	$	0.22	$	0.20	$	0.21	$	0.27
Basic weighted average common shares	171,101		173,317		181,457		183,362
Diluted weighted average common shares	189,013		190,479		191,271		191,837

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Subsequent Event	12 Months Ended
Subsequent Event	Dec. 31, 2011
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On February 8, 2012, the Company announced the resignation of J. Donald Sherman as its Chief Financial Officer on February 29, 2012 and the election of James Benson, Akamai's Senior Vice President of Finance, as his successor effective as of March 1, 2012.

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

AKAMAI TECHNOLOGIES, INC.

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS



Description	Balance at beginning of period		Charged to operations			Other			Deductions			Balance at end of period
Year ended December 31, 2009:
Allowances deducted from asset accounts:
Reserves for accounts receivable	$	11,270	21,566		1	(716	)	3	(21,541	)	2	$	10,579
Deferred tax asset valuation allowance	$	7,096	(10	)		—			—			$	7,086
Year ended December 31, 2010:
Allowances deducted from asset accounts:
Reserves for accounts receivable	$	10,579	22,657		1	(301	)	3	(27,703	)	2	$	5,232
Deferred tax asset valuation allowance	$	7,086	465			—			(144	)		$	7,407
Year ended December 31, 2011:
Allowances deducted from asset accounts:
Reserves for accounts receivable	$	5,232	16,165		1	(420	)	3	(16,422	)	2	$	4,555
Deferred tax asset valuation allowance	$	7,407	(6,974	)	4	—			—			$	433

________________


1.	Amounts represent charges to bad debt expense and reductions to revenue for increases to the allowance for doubtful accounts and to the reserve for cash-basis customers.


2.	Amounts represent cash collections from customers for accounts previously reserved and write-offs of accounts receivable recorded against the allowance for doubtful accounts or the reserve for cash-basis customers.


3.	Amounts represent write-offs of account receivables previously reserved.


4.	Amount represents the reversal of a tax valuation allowance related to NOL carryforwards not expected to be realized.

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Use of Estimates	The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America. These principles require management to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the amounts disclosed in the related notes to the consolidated financial statements. Actual results and outcomes may differ materially from management’s estimates, judgments and assumptions. Significant estimates, judgments and assumptions used in these financial statements include, but are not limited to, those related to revenues, accounts receivable and related reserves, valuation and impairment of investments and marketable securities, loss contingencies, useful lives and realizability of long-lived assets and goodwill, capitalized internal-use software costs, income and other tax reserves, and accounting for stock-based compensation. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. The effects of material revisions in estimates are reflected in the consolidated financial statements prospectively from the date of the change in estimate.
Revenue Recognition	The Company recognizes service revenue in accordance with the authoritative guidance for revenue recognition, including guidance on revenue arrangements with multiple deliverables. Revenue is recognized only when the price is fixed or determinable, persuasive evidence of an arrangement exists, the service is performed and collectability of the resulting receivable is reasonably assured. Akamai primarily derives revenues from the sale of services to customers executing contracts having terms of one year or longer. These contracts generally commit the customer to a minimum monthly, quarterly or annual level of usage and specify the rate at which the customer must pay for actual usage above the monthly, quarterly or annual minimum. For these services, Akamai recognizes the monthly minimum as revenue each month, provided that an enforceable contract has been signed by both parties, the service has been delivered to the customer, the fee for the service is fixed or determinable and collection is reasonably assured. Should a customer’s usage of Akamai services exceed the monthly, quarterly or annual minimum, Akamai recognizes revenue for such excess in the period of the usage. For annual or other non-monthly period revenue commitments, the Company recognizes revenue monthly based upon the customer’s actual usage each month of the commitment period and only recognizes any remaining committed amount for the applicable period in the last month thereof. The Company typically charges its customers an integration fee when the services are first activated. Integration fees are recorded as deferred revenue and recognized as revenue ratably over the estimated life of the customer arrangement. The Company also derives revenue from services sold as discrete, non-recurring events or based solely on usage. For these services, the Company recognizes revenue once the event or usage has occurred. When more than one element is contained in a revenue arrangement, the Company determines the fair value for each element in the arrangement based on vendor-specific objective evidence (“VSOE”) for each respective element, including any renewal rates for services contractually offered to the customer. For arrangements in which the Company is unable to establish VSOE, third-party evidence ("TPE") of the fair value of each element is determined based upon the price charged when the element is sold separately by another vendor. For arrangements in which the Company is unable to establish VSOE or TPE for each element, the Company uses the best estimate of selling price ("BESP") to determine the fair value of the separate deliverables. The Company allocates arrangement consideration across the multiple elements using the relative selling price method. At the inception of a customer contract for service, the Company makes an assessment as to that customer’s ability to pay for the services provided. The Company bases its assessment on a combination of factors, including the successful completion of a credit check or financial review, its collection experience with the customer and other forms of payment assurance. Upon the completion of these steps, the Company recognizes revenue monthly in accordance with its revenue recognition policy. If the Company subsequently determines that collection from the customer is not reasonably assured, the Company records an allowance for doubtful accounts and bad debt expense for all of that customer’s unpaid invoices and ceases recognizing revenue for continued services provided until cash is received from the customer. Changes in the Company’s estimates and judgments about whether collection is reasonably assured would change the timing of revenue or amount of bad debt expense that the Company recognizes. The Company also sells its services through a reseller channel. Assuming all other revenue recognition criteria are met, the Company recognizes revenue from reseller arrangements based on the reseller’s contracted non-refundable minimum purchase commitments over the term of the contract, plus amounts sold by the reseller to its customers in excess of the minimum commitments. Amounts attributable to this excess usage are recognized as revenue in the period in which the service is provided. From time to time, the Company enters into contracts to sell its services or license its technology to unrelated enterprises at or about the same time that it enters into contracts to purchase products or services from the same enterprise. If the Company concludes that these contracts were negotiated concurrently, the Company records as revenue only the net cash received from the vendor, unless the product or service received has a separate identifiable benefit, and the fair value of the vendor’s product or service can be established objectively. The Company may from time to time resell licenses or services of third parties. The Company records revenue for these transactions on a gross basis when the Company has risk of loss related to the amounts purchased from the third party and the Company adds value to the license or service, such as by providing maintenance or support for such license or service. If these conditions are present, the Company recognizes revenue when all other revenue recognition criteria are satisfied. Deferred revenue represents amounts billed to customers for which revenue has not been recognized. Deferred revenue primarily consists of the unearned portion of monthly billed service fees, prepayments made by customers for future periods, deferred integration and activation set-up fees and amounts billed under customer arrangements with extended payment terms.
Cost of Revenues	Cost of revenues consists primarily of fees paid to network providers for bandwidth and for housing servers in third-party network data centers, also known as co-location costs. Cost of revenues also includes network operation employee costs, network storage costs, cost of software licenses, depreciation of network equipment used to deliver the Company’s services, amortization of network-related internal-use software and costs for the production of live events. The Company enters into contracts for bandwidth with third-party network providers with terms typically ranging from several months to two years. These contracts generally commit Akamai to pay minimum monthly fees plus additional fees for bandwidth usage above the committed level. In some circumstances, Internet service providers (“ISPs”) make available to Akamai rack space for the Company’s servers and access to their bandwidth at discounted or no cost. In exchange, the ISP and its customers benefit by receiving content through a local Akamai server resulting in better content delivery. The Company does not consider these relationships to represent the culmination of an earnings process. Accordingly, the Company does not recognize as revenue the value to the ISPs associated with the use of Akamai’s servers, nor does the Company recognize as expense the value of the rack space and bandwidth received at discounted or no cost.
Accounting for Stock-Based Compensation	The Company recognizes compensation costs for all stock-based payment awards made to employees and directors based upon the awards’ grant-date fair value. The stock-based payment awards include employee stock options, restricted stock, restricted stock units, deferred stock units and employee stock purchases related to the Company’s employee stock purchase plan. For stock options, the Company has selected the Black-Scholes option-pricing model to determine the fair value of stock option awards. For stock options, restricted stock, restricted stock units and deferred stock units that contain only a service-based vesting feature, the Company recognizes compensation cost on a straight-line basis over the awards’ vesting periods. For awards with a performance condition-based vesting feature, the Company recognizes compensation cost on a graded-vesting basis over the awards’ expected vesting periods, commencing when achievement of the performance condition is deemed probable. In addition, for awards that vest and become exercisable only upon achievement of specified performance conditions, the Company makes judgments and estimates each quarter about the probability that such performance conditions will be met or achieved. Any changes to those estimates that the Company makes from time to time may have a significant impact on the stock-based compensation expense recorded and could materially impact the Company’s result of operations.
Research and Development Costs and Capitalized Internal-Use Software	Research and development costs consist primarily of payroll and related personnel costs for the design, development, deployment, testing, operation and enhancement of the Company’s services and network. Costs incurred in the development of the Company’s services are expensed as incurred, except certain software development costs eligible for capitalization. Costs incurred during the application development stage of internal-use software projects, such as those used in the Company’s network operations, are capitalized in accordance with the accounting guidance for costs of computer software developed for internal use. Capitalized costs include external consulting fees, payroll and payroll-related costs and stock-based compensation expense for employees in the Company’s development and information technology groups who are directly associated with, and who devote time to, the Company’s internal-use software projects during the application development stage. Capitalization begins when the planning stage is complete and the Company commits resources to the software project. Capitalization ceases when the software has been tested and is ready for its intended use. Amortization of the asset commences when the software is complete and placed in service. The Company amortizes completed internal-use software to cost of revenues over an estimated life of two years. Costs incurred during the planning, training and post-implementation stages of the software development life-cycle are expensed as incurred. Costs related to upgrades and enhancements of existing internal-use software that increase the functionality of the software are also capitalized.
Fair Value of Financial Measurements	The Company's assets and liabilities are re-measured and reported at fair value at each reporting period. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company has certain financial assets and liabilities recorded at fair value (principally cash equivalents and short- and long-term marketable securities) that have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the guidance. Fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in accessible active markets for identical assets or liabilities. Fair values determined by Level 2 inputs utilize data points that are observable, such as quoted prices, interest rates and yield curves. Fair values determined by Level 3 inputs are based on unobservable data points for the asset or liability.
Concentrations of Credit Risk	The amounts reflected in the consolidated balance sheets for accounts receivable, other current assets, accounts payable, accrued liabilities and other current liabilities approximate their fair values due to their short-term maturities. The Company maintains the majority of its cash, cash equivalents and marketable securities balances principally with major financial institutions that the Company believes to be of high credit standing. The Company believes that, as of December 31, 2011, its concentration of credit risk related to cash equivalents and marketable securities was not significant. Concentrations of credit risk with respect to accounts receivable are primarily limited to certain customers to which the Company makes substantial sales. The Company’s customer base consists of a large number of geographically dispersed customers diversified across several industries. To reduce risk, the Company routinely assesses the financial strength of its customers. Based on such assessments, the Company believes that its accounts receivable credit risk exposure is limited. For the years ended December 31, 2011, 2010 and 2009, no customer accounted for more than 10% of total revenues. As of December 31, 2011 and December 31, 2010, one customer had an account receivable balance greater than 10% of total accounts receivable. The Company believes that, as of December 31, 2011, its concentration of credit risk related to accounts receivable was not significant.
Taxes	The Company's provision for income taxes is comprised of a current and a deferred portion. The current income tax provision is calculated as the estimated taxes payable or refundable on tax returns for the current year. The deferred income tax provision is calculated for the estimated future tax effects attributable to temporary differences and carryforwards using expected tax rates in effect during the years in which the differences are expected to reverse or the carryforwards are expected to be realized. The Company currently has net deferred tax assets consisting of net operating loss (“NOL”) carryforwards, tax credit carryforwards and deductible temporary differences. Management periodically weighs the positive and negative evidence to determine if it is more likely than not that some or all of the deferred tax assets will be realized. The Company has recorded certain tax reserves to address potential exposures involving its income tax and sales and use tax positions. These potential tax liabilities result from the varying application of statutes, rules, regulations and interpretations by different taxing jurisdictions. The Company's estimate of the value of its tax reserves contains assumptions based on past experiences and judgments about the interpretation of statutes, rules and regulations by taxing jurisdictions. It is possible that the costs of the ultimate tax liability or benefit from these matters may be materially more or less than the amount that the Company estimated. Uncertainty in income taxes is recognized in the Company's financial statements under guidance that prescribes a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination. If the tax position is deemed more-likely-than-not to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. As of December 31, 2011 the Company had unrecognized tax benefits of $17.2 million, including accrued interest and penalties (see Note 18). The Company uses the modified prospective transition method for calculating the tax effects of stock-based compensation. Additionally, the Company uses the “long-form method,” as provided in the guidance for stock-based compensation to determine the pool of windfall tax benefits upon adoption of the guidance. The Company's accounting policy is to use the tax law ordering approach related to intra-period tax allocation for utilization of tax attributes. In addition, the Company has elected that only the direct effects of equity awards are considered in the calculation of windfalls or shortfalls.
Foreign Currency Translation	The assets and liabilities of the Company's subsidiaries are translated at the applicable exchange rate as of the balance sheet date, and revenues and expenses are translated at an average rate over the period. Resulting currency translation adjustments are recorded as a component of accumulated other comprehensive income (loss), a separate component of stockholders’ equity. Gains and losses on inter-company and other non-functional currency transactions are recorded in other income (expense), net. For the years ended December 31, 2011, 2010 and 2009, the Company recorded net foreign currency losses of $1.9 million, $2.5 million and $1.7 million, respectively, in the consolidated statement of operations. Starting in 2011, the Company enters into short-term foreign currency forward contracts to offset foreign exchange gains and losses generated by the re-measurement of certain assets and liabilities recorded in non-functional currencies. Changes in the fair value of these derivatives, as well as re-measurement gains and losses, are recognized in current earnings in other income (expense), net. As of December 31, 2011, the fair value of the forward currency contracts and the underlying net loss for the year ended December 31, 2011 were deemed to be immaterial. The Company's foreign currency forward contracts include credit risk to the extent that its counterparties may be unable to meet the terms of the agreements. The Company minimizes counterparty credit (or repayment) risk by entering into transactions only with major financial institutions of investment grade credit rating.
Cash, Cash Equivalents and Marketable Securities	Cash and cash equivalents consist of cash held in bank deposit accounts and short-term, highly-liquid investments with remaining maturities of three months or less at the date of purchase. Total cash, cash equivalents and marketable securities were $1,230.0 million and $1,243.4 million at December 31, 2011 and 2010, respectively. Short-term marketable securities consist of corporate, government and other securities with remaining maturities of more than three months at the date of purchase and less than one year from the date of the balance sheet. Long-term marketable securities consist of corporate, government and other securities with maturities of more than one year from the date of the balance sheet. Short-term and long-term marketable securities include investments that are restricted as to use. The Company classifies most debt securities and equity securities with readily determinable market values as “available for sale” in accordance with the authoritative guidance for accounting for certain investments in debt and equity securities. These investments are classified as marketable securities on the consolidated balance sheet and are carried at fair market value, with unrealized gains and losses considered to be temporary in nature reported as accumulated other comprehensive income (loss), a separate component of stockholders’ equity. The Company reviews all investments for reductions in fair value that are other-than-temporary. When such reductions occur, the cost of the investment is adjusted to fair value through recording a loss on investments in the consolidated statement of operations. Gains and losses on investments are calculated on the basis of specific identification. Investments and marketable securities are considered to be impaired when a decline in fair value below cost basis is determined to be other-than-temporary. The Company periodically evaluates whether a decline in fair value below cost basis is other-than-temporary by considering available evidence regarding these investments including, among other factors: the duration of the period that, and extent to which, the fair value is less than cost basis, the financial health of and business outlook for the issuer, including industry and sector performance and operational and financing cash flow factors, overall market conditions and trends and Akamai’s intent and ability to retain its investment in the security for a period of time sufficient to allow for an anticipated recovery in market value. Once a decline in fair value is determined to be other-than-temporary, a write-down is recorded and a new cost basis in the security is established. Assessing the above factors involves inherent uncertainty. Write-downs, if recorded, could be materially different from the actual market performance of investments and marketable securities in the Company’s portfolio, if, among other things, relevant information related to its investments and marketable securities was not publicly available or other factors not considered by the Company would have been relevant to the determination of impairment. Included in the Company’s long-term marketable securities at December 31, 2010 were auction rate securities (“ARS”) that were primarily AAA-rated bonds, all of which were collateralized by federally guaranteed student loans. See Note 6 below for a discussion of the Company’s ARS holdings. Based upon authoritative guidance related to disclosures of fair value measurements that was adopted in early 2010, the Company discloses the gross presentation of activity within the Level 3 fair value measurement roll-forward and details of transfers in and out of Level 1 and 2 fair value measurements. The Company also discloses the level of disaggregation of fair value measurements and disclosures on inputs and valuation techniques. A change in the hierarchy of an investment from its current level is reflected in the period during which the pricing methodology of such investment changed. Disclosure of the transfer of securities from Level 1 to Level 2 or Level 3 is made in the event that the related security is significant to total cash and investments. The Company did not have any transfers of assets and liabilities between Level 1 and Level 2 of the fair value measurement hierarchy during the years ended December 31, 2011 and 2010. The Company’s commercial paper, U.S. government agency obligations and U.S. corporate debt securities are classified as Level 2 securities. The Company primarily relies on valuation pricing models, recent bid prices and broker quotes to determine the fair value of these securities. The valuation models for Level 2 assets are developed and maintained by third party pricing services and use a number of standard inputs to the valuation model, including benchmark yields, reported trades, broker/dealer quotes where the party is standing ready and able to transact, issuer spreads, benchmark securities, bids, offers and other reference data. The valuation model may prioritize these inputs differently at each balance sheet date for any given security based on market conditions. Not all of the standard inputs listed will be used each time in the valuation models. For each asset class, quantifiable inputs related to perceived market movements and sector news may be considered in addition to the standard inputs.
Accounts Receivable and Related Reserves	The Company’s accounts receivable balance includes unbilled amounts that represent revenues recorded for customers that are typically billed monthly in arrears. The Company records reserves against its accounts receivable balance. These reserves consist of allowances for doubtful accounts and reserves for cash-basis customers. Increases and decreases in the allowance for doubtful accounts are included as a component of general and administrative expenses. The Company’s reserve for cash-basis customers increases as services are provided to customers where collection is no longer assured. Increases to the reserve for cash-basis customers are recorded as reductions of revenues. The reserve decreases and revenue is recognized when and if cash payments are received. Estimates are used in determining these reserves and are based upon the Company’s review of outstanding balances on a customer-specific, account-by-account basis. The allowance for doubtful accounts is based upon a review of customer receivables from prior sales with collection issues where the Company no longer believes that the customer has the ability to pay for services previously provided. The Company also performs ongoing credit evaluations of its customers. If such an evaluation indicates that payment is no longer reasonably assured for services provided, any future services provided to that customer will result in the creation of a cash-basis reserve until the Company receives consistent payments. The Company does not have any off-balance sheet credit exposure related to its customers.
Property and Equipment	Property and equipment are recorded at cost, net of accumulated depreciation and amortization. Property and equipment generally includes purchases of items with a per-unit value greater than $1,000 and a useful life greater than one year. Depreciation and amortization are computed on a straight-line basis over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of related lease terms or their estimated useful lives. Property and equipment acquired under capital leases are depreciated over the shorter of the related lease terms or the estimated useful lives of the assets. The Company periodically reviews the estimated useful lives of property and equipment. Changes to the estimated useful lives are recorded prospectively from the date of the change. Upon retirement or sale, the cost of the assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is included in income from operations. Repairs and maintenance costs are expensed as incurred.
Goodwill and Other Intangible Assets	The Company tests goodwill for impairment on an annual basis or more frequently if events or changes in circumstances indicate that the asset might be impaired. The Company performed impairment tests of goodwill as of December 31, 2011 and 2010. These tests did not result in an impairment to goodwill. Other intangible assets consist of completed technologies, customer relationships, trademarks, non-compete agreements arising from acquisitions of businesses and acquired license rights. Purchased intangible assets, other than goodwill, are amortized over their estimated useful lives based upon the estimated economic value derived from the related intangible asset (see Note 3). Goodwill is carried at its historical cost.
Valuation of Other Long-Lived Assets	Long-lived assets are reviewed for impairment whenever events or changes in circumstances, such as service discontinuance, technological obsolescence, a significant decrease in the Company’s market capitalization, facility closures or work-force reductions, indicate that the carrying amount of the long-lived asset may not be recoverable. When such events occur, the Company compares the carrying amount of the asset to the undiscounted expected future cash flows related to the asset. If this comparison indicates that an impairment is present, the amount of the impairment is calculated as the difference between the carrying amount and the fair value of the asset. The Company did not have any indications of impairment for the years ended December 31, 2011, 2010 and 2009.
Restructuring Charges	A restructuring liability related to employee terminations is recorded by the Company when a one-time benefit arrangement is communicated to an employee who is involuntarily terminated as part of a reorganization and the amount of the termination benefit is known, provided that the employee is not required to render future services in order to receive the termination benefit. The Company records restructuring liabilities, discounted at the appropriate rate, for facility leases only when the space is both vacated and all actions needed to make the space readily available for sublease have been completed. The Company records restructuring liabilities for estimated costs to terminate a facility lease before the end of its contractual term or for estimated costs that will continue to be incurred under the lease for its remaining term where there is no economic benefit to the Company, net of an estimate of sublease income.
Litigation	The Company is currently involved in certain legal proceedings. The Company estimates the range of liability related to pending litigation where the amount and range of loss can be estimated. The Company records its best estimate of a loss when the loss is considered probable. Where a liability is probable and there is a range of estimated loss with no best estimate in the range, the Company records the minimum estimated liability related to the claim. As additional information becomes available, the Company reassesses the potential liability related to the Company’s pending litigation and revises its estimate.
Advertising Expense	The Company recognizes advertising expense as incurred. The Company recognized total advertising expense of $0.8 million, $0.5 million and $0.7 million for the years ended December 31, 2011, 2010 and 2009, respectively.

Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share Reconciliation [Abstract]

Schedule of Components Used in Diluted and Basic Income Per Common Share

The following table sets forth the components used in the computation of basic and diluted net income per common share (in thousands, except per share data):



	For the Years Ended December 31,
	2011		2010		2009
Numerator:
Net income	$	200,904	$	171,220	$	145,913
Add back of interest expense on 1% convertible senior notes (net of tax)	—		1,059		1,746
Numerator for diluted net income per common share	$	200,904	$	172,279	$	147,659
Denominator:
Denominator for basic net income per common share	183,866		177,309		171,425
Effect of dilutive securities:
Stock options	2,550		3,821		2,805
Effect of escrow contingencies	—		254		342
Restricted stock units and deferred stock units	1,140		1,395		1,153
Assumed conversion of 1% convertible senior notes	—		7,871		12,933
Denominator for diluted net income per common share	187,556		190,650		188,658
Basic net income per common share	$	1.09	$	0.97	$	0.85
Diluted net income per common share	$	1.07	$	0.90	$	0.78

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2011

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss) is reported as a component of stockholders’ equity and consisted of the following (in thousands):



	December 31,
	2011			2010
Net unrealized gain (loss) on investments, net of tax of $(14) at December 31, 2011 and $5,005 at December 31, 2010	$	191		$	(7,844	)
Foreign currency translation adjustments	(1,450		)	2,103
Accumulated other comprehensive loss	$	(1,259	)	$	(5,741	)

Marketable Securities and Investments (Tables)

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Schedule of Marketable Securities

The following is a summary of marketable securities and other investment-related assets held at December 31, 2011 and 2010 (in thousands):



			Gross Unrealized					Aggregate Fair Value		Classified on Balance Sheet
										Short-term Marketable Securities		Long-term Marketable Securities
As of December 31, 2011	Cost		Gains		Losses					Short-term Marketable Securities		Long-term Marketable Securities
Available-for-sale securities:
Certificates of deposit	$	42	$	—	$	—		$	42	$	—	$	42
Corporate debt securities	524,515		873		(580		)	524,808		285,012		239,796
U.S. government agency obligations	145,995		78		(165		)	145,908		5,017		140,891
	$	670,552	$	951	$	(745	)	$	670,758	$	290,029	$	380,729
			Gross Unrealized					Aggregate Fair Value		Classified on Balance Sheet
										Short-term Marketable Securities		Long-term Marketable Securities
As of December 31, 2010	Cost		Gains		Losses					Short-term Marketable Securities		Long-term Marketable Securities
Available-for-sale securities:
Certificates of deposit	$	96	$	—	$	—		$	96	$	51	$	45
Commercial paper	59,912		34		(2		)	59,944		59,944		—
Corporate debt securities	651,855		1,416		(736		)	652,535		301,625		350,910
U.S. government agency obligations	161,722		102		(119		)	161,705		13,385		148,320
Auction rate securities	150,800		—		(13,544		)	137,256		—		137,256
	$	1,024,385	$	1,552	$	(14,401	)	$	1,011,536	$	375,005	$	636,531

Schedule of Fair Value Measurement



	Total Fair Value at December 31, 2011		Fair Value Measurements at Reporting Date Using
	Total Fair Value at December 31, 2011		Level 1		Level 2		Level 3
Money market funds	$	302,507	$	302,507	$	—	$	—
Certificates of deposit	42		42		—		—
Commercial paper	57,498		—		57,498		—
U.S. government agency obligations	145,908		—		145,908		—
Corporate debt securities	524,808		—		524,808		—
	$	1,030,763	$	302,549	$	728,214	$	—



	Total Fair Value at December 31, 2010		Fair Value Measurements at Reporting Date Using
	Total Fair Value at December 31, 2010		Level 1		Level 2		Level 3
Money market funds	$	55,648	$	55,648	$	—	$	—
Certificates of deposit	96		96		—		—
Commercial paper	59,944		—		59,944		—
U.S. government agency obligations	161,705		—		161,705		—
Corporate debt securities	652,535		—		652,535		—
Auction rate securities	137,256		—		—		137,256
	$	1,067,184	$	55,744	$	874,184	$	137,256

Schedule of Activity of Major Classes of Assets Measured at Fair Value Using Level 3 Inputs

The following tables reflect the activity for the Company’s major classes of assets measured at fair value using Level 3 inputs for the years ended December 31, 2011 and 2010 (in thousands):



	Auction Rate Securities
Balance as of December 31, 2010	$	137,256
Redemptions and sales of securities	(137,256		)
Balance as of December 31, 2011	$	—



	Auction Rate Securities			Put Option related to Auction Rate Securities			Total
Balance as of December 31, 2009	$	244,505		$	9,614		$	254,119
Redemptions of securities	(124,100		)	—			(124,100		)
Unrealized gains included in accumulated other comprehensive income (loss), net	7,237			—			7,237
Realized gain on auction rate securities included in the statement of operations	9,614			—			9,614
Realized loss on other investment-related assets included in the statement of operations	—			(9,614		)	(9,614		)
Balance as of December 31, 2010	$	137,256		$	—		$	137,256

Schedule of Contractual Maturities of Marketable Securities and Other Investment Related Assets

Contractual maturities of the Company’s marketable securities held at December 31, 2011 and 2010 are as follows:



	December 31,
	2011		2010
Available-for-sale securities:
Due in one year or less	$	290,029	$	375,005
Due after 1 year through 5 years	380,729		499,275
Due after 5 years	—		137,256
	$	670,758	$	1,011,536

- Definition

Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-1
-Paragraph 21
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 17
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 19, 20, 21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References + Details

- Definition

Tabular disclosure of the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods. Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 33
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 6
-Footnote 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2011

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Schedule of Accounts Receivable

Net accounts receivable consisted of the following (in thousands):



	December 31,
	2011			2010
Trade accounts receivable	$	142,166		$	116,212
Unbilled accounts	73,325			64,386
Gross accounts receivable	215,491			180,598
Allowance for doubtful accounts	(1,627		)	(1,329		)
Reserve for cash-basis customers	(2,928		)	(3,903		)
Total accounts receivable reserves	(4,555		)	(5,232		)
Accounts receivable, net	$	210,936		$	175,366

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (dollars in thousands):



	December 31,						Estimated Useful Lives in Years
	2011			2010			Estimated Useful Lives in Years
Computer and networking equipment	$	561,952		$	492,685		3
Purchased software	31,388			29,885			3
Furniture and fixtures	14,166			12,770			5
Office equipment	5,676			4,792			3
Leasehold improvements	36,358			29,914			2-12
Internal-use software	222,914			177,918			2
	872,454			747,964
Accumulated depreciation and amortization	(579,411		)	(492,035		)
	$	293,043		$	255,929

Schedule of Capitalized Internal-Use Software Costs

The following table summarizes capitalized internal-use software costs (in thousands):



	December 31,
	2011			2010
Gross costs capitalized	$	230,938		$	181,376
Less: cumulative impairments	(8,024		)	(3,458		)
	222,914			177,918
Less: accumulated amortization, net of impairments	(152,140		)	(117,936		)
Net book value of capitalized internal-use software	$	70,774		$	59,982

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Other Intangible Assets [Abstract]

Schedule of the Changes in the Carrying Amount of Goodwill

The changes in the carrying amount of goodwill for the years ended December 31, 2011 and 2010 were as follows (in thousands):



	Goodwill
Ending balance, December 31, 2009	$	441,347
Velocitude acquisition	11,567
Ending balance, December 31, 2010 and 2011	$	452,914

Schedule of Other Intangible Assets

Other intangible assets that are subject to amortization consist of the following (dollars in thousands):



	December 31, 2011
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization period in years
Completed technologies	$	36,731	$	(22,913	)	$	13,818	6
Customer relationships	88,700		(60,202		)	28,498		9
Non-compete agreements	8,340		(5,270		)	3,070		4
Trademarks and trade names	800		(800		)	—		4
Acquired license rights	490		(490		)	—		10
Total	$	135,061	$	(89,675	)	$	45,386



	December 31, 2010
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization period in years
Completed technologies	$	36,731	$	(16,520	)	$	20,211	6
Customer relationships	88,700		(50,832		)	37,868		9
Non-compete agreements	8,340		(4,070		)	4,270		4
Trademarks	800		(693		)	107		4
Acquired license rights	490		(490		)	—		10
Total	$	135,061	$	(72,605	)	$	62,456

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2011

Accounts Payable and Accrued Liabilities, Current [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):



	December 31,
	2011		2010
Payroll and other related benefits	$	39,920	$	51,591
Bandwidth and co-location	29,291		21,787
Property, use and other taxes	9,923		15,849
Professional service fees	4,162		2,678
Contingent consideration	—		990
Other	2,075		1,766
Total	$	85,371	$	94,661

Commitments, Contingencies and Guarantees (Tables)

12 Months Ended

Dec. 31, 2011

Commitments Contingencies and Guarantees [Abstract]

Minimum Aggregate Future Obligations Under Non-Cancelable Leases

The minimum aggregate future obligations under non-cancelable leases as of December 31, 2011 were as follows (in thousands):




	Operating Leases
2012	$	23,360
2013	21,750
2014	20,544
2015	19,116
2016	14,343
Thereafter	39,644
Total	$	138,757

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References + Details

Restructurings and Lease Terminations (Tables)

12 Months Ended

Dec. 31, 2011

Restructuring and Related Activities [Abstract]

Schedule of Accrual and Usage of Restructuring Charges

The following table summarizes the accrual and usage of the restructuring charges (in millions):



	Leases			Severance			Total
Ending balance, December 31, 2008	$	0.3		$	1.4		$	1.7
Restructuring charge	—			0.5			0.5
Cash payments	(0.2		)	(1.2		)	(1.4		)
Ending balance, December 31, 2009	0.1			0.7			0.8
Cash payments	(0.1		)	(0.4		)	(0.5		)
Ending balance, December 31, 2010	—			0.3			0.3
Restructuring charge	0.7			4.2			4.9
Cash Payments	(0.1		)	(1.2		)	(1.3		)
Ending balance, December 31, 2011	$	0.6		$	3.3		$	3.9
Current portion of accrued restructuring	$	0.1		$	3.3		$	3.4
Long-term portion of accrued restructuring	$	0.5		$	—		$	0.5

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock Based Compensation Expense



	For the Years Ended December 31,
	2011			2010			2009
Stock-based compensation expense by type of award:
Stock options	$	13,533		$	15,154		$	17,636
Deferred stock units	1,885			1,885			2,085
Restricted stock units	47,807			62,928			41,584
Shares issued under the 1999 ESPP	5,553			4,319			3,772
Amounts capitalized as internal-use software	(7,473		)	(7,818		)	(6,280		)
Total stock-based compensation before income taxes	61,305			76,468			58,797
Less: Income tax benefit	(21,212		)	(26,566		)	(22,633		)
Total stock-based compensation, net of taxes	$	40,093		$	49,902		$	36,164
Effect of stock-based compensation on income by line item:
Cost of revenues	$	2,360		$	2,806		$	2,195
Research and development expense	11,125			14,539			10,967
Sales and marketing expense	27,990			35,525			27,411
General and administrative expense	19,830			23,598			18,224
Provision for income taxes	(21,212		)	(26,566		)	(22,633		)
Total cost related to stock-based compensation, net of taxes	$	40,093		$	49,902		$	36,164

Schedule of Stock Options Granted Black Scholes



	For the Years Ended December 31,
	2011	2010	2009
Expected life (years)	4.2	4.2	4.1
Risk-free interest rate (%)	1.3	1.4	1.7
Expected volatility (%)	48.9	50.9	54.8
Dividend yield (%)	—	—	—

Schedule of ESPP Granted Black Scholes



	For the Years Ended December 31,
	2011	2010	2009
Expected life (years)	0.5	0.5	0.5
Risk-free interest rate (%)	0.1	0.2	0.4
Expected volatility (%)	43.7	51.2	69.2
Dividend yield (%)	—	—	—

Schedule of Summary of Stock Option Activity

The following table summarizes stock option activity during the years ended December 31, 2011, 2010 and 2009:



	Shares (in thousands)		Weighted Average Exercise Price
Outstanding at December 31, 2008	10,380		$	18.76
Granted	1,146		19.11
Exercised	(1,178	)	10.09
Forfeited and expired	(326	)	33.68
Outstanding at December 31, 2009	10,022		19.34
Granted	1,577		39.72
Exercised	(2,366	)	14.21
Forfeited and expired	(287	)	39.69
Outstanding at December 31, 2010	8,946		23.63
Granted	656		37.33
Exercised	(1,044	)	12.09
Forfeited and expired	(541	)	43.96
Outstanding at December 31, 2011	8,017		$	24.89
Exercisable at December 31, 2011	6,247		$	22.54

Schedule of Stock Options Outstanding Expected to Vest and Exercisable

The following table summarizes stock options that are outstanding and expected to vest and stock options exercisable at December 31, 2011:



Range of Exercise Price ($)	Options Outstanding and Expected to Vest						Options Exercisable
Range of Exercise Price ($)	Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value		Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Aggregate Intrinsic Value
	(In thousands)	(In years)			(In thousands)		(In thousands)	(In years)			(In thousands)
0.31-0.49	43	2.2	$	0.31	$	1,366	43	2.2	$	0.31	$	1,366
0.89-1.33	249	0.7	0.91		7,816		248	0.7	0.91		7,782
1.40-1.65	170	1.0	1.62		5,217		170	1.0	1.62		5,217
2.27-3.33	64	0.9	2.84		1,871		64	0.9	2.84		1,871
3.71-5.56	448	1.5	4.89		12,272		446	1.5	4.89		12,235
8.28-12.26	375	3.1	12.10		7,579		375	3.1	12.10		7,576
12.76-19.07	2,444	3.5	15.30		41,506		2,183	3.4	15.60		37,588
19.21-28.38	1,403	5.0	24.67		10,678		914	4.6	24.56		7,054
29.36-43.99	1,532	5.7	36.34		582		866	5.6	34.40		353
44.27-56.60	1,204	4.2	50.81		—		938	3.7	51.43		—
	7,932	4.0	24.74		$	88,887	6,247	3.5	22.54		$	81,042
Expected forfeitures	85
Total options outstanding	8,017

Schedule Of Deferred Stock Units Activity

The following table summarizes the DSU activity for the years ended December 31, 2011, 2010 and 2009:



	Units (in thousands)		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2008	207		$	24.86
Granted	97		21.56
Vested and distributed	(17	)	33.07
Outstanding at December 31, 2009	287		21.04
Granted	47		39.95
Vested and distributed	(77	)	18.40
Outstanding at December 31, 2010	257		25.31
Granted	58		32.48
Vested and distributed	(15	)	33.78
Forfeited	(1	)	39.95
Outstanding at December 31, 2011	299		$	26.25

Schedule of Restricted Stock Units by Type

The following table summarizes the different types of restricted stock units (“RSUs”) granted by the Company (in thousands):



	For the Years Ended December 31,
	2011	2010	2009
RSUs with service-based vesting conditions	3,003	1,597	2,342
RSUs with performance-based vesting conditions	550	1,124	1,974
Total	3,553	2,721	4,316

Schedule of Restricted Stock Units Activity

The following table summarizes the RSU activity for the years ended December 31, 2011, 2010 and 2009:



	Units (in thousands)		Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2008	6,199		$	34.64
Granted	4,316		18.73
Vested	(3,282	)	28.20
Forfeited	(370	)	25.99
Outstanding at December 31, 2009	6,863		27.63
Granted	2,721		26.56
Vested	(1,971	)	23.97
Forfeited	(1,406	)	47.47
Outstanding at December 31, 2010	6,207		23.76
Granted	3,553		33.75
Vested	(1,931	)	23.15
Forfeited	(1,312	)	30.62
Outstanding at December 31, 2011	6,517		$	27.95

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References + Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Tax Disclosure [Abstract]

Components of Income Before Tax

The components of income before provision for income taxes were as follows (in thousands):



	For the Years Ended December 31,
	2011		2010		2009
Domestic	$	257,656	$	235,892	$	221,071
Foreign	49,539		26,480		16,161
Income before provision for income taxes	$	307,195	$	262,372	$	237,232

Schedule of Provision for Income Tax

The provision for income taxes consisted of the following (in thousands):



	For the Years Ended December 31,
	2011			2010		2009
Current tax provision
Federal	$	39,517		$	19,619	$	1,393
State	2,953			4,993		4,229
Foreign	10,193			4,078		3,991
Deferred tax provision (benefit)
Federal	54,980			55,335		76,410
State	4,413			2,393		2,068
Foreign	1,209			4,269		3,238
Change in valuation allowance	(6,974		)	465		(10		)
	$	106,291		$	91,152	$	91,319

Schedule of Difference Between Effective and Statutory

The Company’s effective rate differed from the statutory rate as follows:



	For the Years Ended December 31,
	2011		2010		2009
United States federal income tax rate	35.0	%	35.0	%	35.0	%
State taxes	2.8		2.9		3.7
Nondeductible stock-based compensation	0.8		0.1		1.2
United States federal and state research and development credits	(2.4	)	(2.6	)	(1.4	)
Change in state tax rates	(0.1	)	0.5		—
Foreign earnings	(2.2	)	(0.4	)	0.1
Expiration of capital loss carryforward	2.1		—		—
Other	0.9		(1.0	)	(0.1	)
Change in the deferred tax asset valuation allowance	(2.3	)	0.2		—
	34.6	%	34.7	%	38.5	%

Net Deferred Tax and Valuation Allowance

The components of the net deferred tax asset and the related valuation allowance were as follows (in thousands):



	December 31,
	2011			2010
Net operating loss and credit carryforwards	$	9,323		$	35,202
Depreciation and amortization	30,702			60,935
Compensation costs	35,959			32,221
Impairment loss on marketable securities	—			5,005
Other	15,530			20,782
Deferred tax assets	91,514			154,145
Acquired intangible assets not deductible	(16,972		)	(22,784		)
Internal-use software capitalized	(24,165		)	(20,527		)
Impairment loss on marketable securities	(15		)	—
Deferred tax liabilities	(41,152		)	(43,311		)
Valuation allowance	(433		)	(7,407		)
Net deferred tax assets	$	49,929		$	103,427

Unrecognized Tax Benefits

The following is a roll-forward of the Company’s unrecognized tax benefits (in millions):



	For the Years Ended December 31,
	2011			2010
Unrecognized tax benefits — at beginning of year	$	10.8		$	7.0
Gross increases — tax positions of prior periods	—			1.5
Gross increases — current-period tax positions	2.8			2.3
Gross decreases — tax positions of prior periods	(0.8		)	—
Gross decreases — settlements	(0.3		)	—
Unrecognized tax benefits — at end of year	$	12.5		$	10.8

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Reporting [Abstract]

Schedule of Percentage of Revenues Derived from Operations Outside of the United States

The following table summarizes the percentage of the Company's revenues derived from operations outside of the United States:



	For the Years Ended December 31,
	2011		2010		2009
Revenues from outside of the United States	29	%	28	%	28	%
Revenues derived from Europe	18	%	17	%	18	%

Quarterly Financial Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Results (unaudited) [Abstract]

Schedule of Unaudited Quarterly Financial Results



	For the Three Months Ended
	March 31, 2011		June 30, 2011		Sept. 30, 2011		Dec. 31, 2011
	(In thousands, except per share data)
Revenues	$	275,953	$	276,989	$	281,856	$	323,740
Cost of revenues	$	89,068	$	89,647	$	93,284	$	102,544
Net income	$	50,617	$	47,921	$	42,285	$	60,081
Basic net income per share	$	0.27	$	0.26	$	0.23	$	0.34
Diluted net income per share	$	0.26	$	0.25	$	0.23	$	0.33
Basic weighted average common shares	186,849		186,612		183,085		178,916
Diluted weighted average common shares	191,383		190,179		185,704		182,956



	For the Three Months Ended
	March 31, 2010		June 30, 2010		Sept. 30, 2010		Dec. 31, 2010
	(In thousands, except per share data)
Revenues	$	240,029	$	245,318	$	253,551	$	284,688
Cost of revenues	$	67,474	$	71,840	$	77,812	$	86,277
Net income	$	40,878	$	38,123	$	39,709	$	52,510
Basic net income per share	$	0.24	$	0.22	$	0.22	$	0.29
Diluted net income per share	$	0.22	$	0.20	$	0.21	$	0.27
Basic weighted average common shares	171,101		173,317		181,457		183,362
Diluted weighted average common shares	189,013		190,479		191,271		191,837

Nature of Business and Basis of Presentation (Details)	Dec. 31, 2011 countries
Nature of Business and Basis of Presentation [Abstract]
Number of countries servers are in	80

Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) years $ / pure	Dec. 31, 2010 USD ($) customers	Dec. 31, 2009 USD ($) customers
Summary of Significant Accounting Policies [Abstract]
Number of customers accounted for 10% or more of total revenues	0	0	0
Customer revenue as percentage of total revenue, Minimum	10.00%
Number of customers related to greater than 10% of accounts receivable	1	1
Customer account receivable balance as percentage of total account receivable, minimum	10.00%	10.00%
Minimum percentage of tax benefit to be recognized	50.00%
Unrecognized tax benefits including accrued interest and penalties	$ 17.2	$ 15.1
Foreign currency transaction gain (loss)	1.9	2.5	$ 1.7
Cash and cash equivalents and marketable securities	$ 1,230.0	1,243.4
Property and equipment per unit value, minimum (in whole number)	1,000
Property, plant and equipment, useful life, minimum (in years) \| years	1
Advertising expense	$ 0.8	$ 0.5	$ 0.7

Business Acquisition (Details) - USD ($) $ in Thousands	12 Months Ended
Business Acquisition (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2010
Business Acquisition [Line Items]
Liabilities for contingent consideration related to post closing milestones	$ 0	$ 990
Velocitude [Member]
Business Acquisition [Line Items]
Cost of acquisition of all assets and liabilities			$ 12,000
Liabilities for contingent consideration related to post closing milestones			2,400
Payment related to contingent consideration	600	700
Decreased fair value of liability	$ 400	700
Business acquisition purchase price allocation for goodwill		11,600	11,600
Identifiable intangible assets		$ 2,800	$ 2,800

- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph g(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 29, 30, 41, 42, 64
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 65
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 30
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=6910544&loc=d3e4237-128469

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 25
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3629-128468

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6910684&loc=d3e4570-128470

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(3),(c)(1)
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 30
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=6910544&loc=d3e4243-128469

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 25
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3642-128468

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 40
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6910732&loc=d3e4805-128471

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

Net Income per Share (Narrative) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	2.8	1.3	3.1
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	2.6	3.2	3.6

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Net Income per Share (Schedule of Components Used in Diluted and Basic Income Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Numerator [Abstract]
Net income	$ 60,081	$ 42,285	$ 47,921	$ 50,617	$ 52,510	$ 39,709	$ 38,123	$ 40,878	$ 200,904	$ 171,220	$ 145,913
Add back of interest expense on 1% convertible senior notes (net of tax)									0	1,059	1,746
Numerator for diluted net income per common share									$ 200,904	$ 172,279	$ 147,659
Denominator [Abstract]
Denominator for basic net income per common share	178,916	183,085	186,612	186,849	183,362	181,457	173,317	171,101	183,866	177,309	171,425
Effect of dilutive securities:
Stock options									2,550	3,821	2,805
Effect of escrow contingencies									0	254	342
Net cash used in financing activities									1,140	1,395	1,153
Assumed conversion of 1% convertible senior notes									0	7,871	12,933
Denominator for diluted net income per common share	182,956	185,704	190,179	191,383	191,837	191,271	190,479	189,013	187,556	190,650	188,658
Basic net income per common share									$ 1.09	$ 0.97	$ 0.85
Diluted net income per common share									$ 1.07	$ 0.90	$ 0.78

Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized gain (loss) on investments, net of tax of $(14) at December 31, 2011 and $5,005 at December 31, 2010	$ 191	$ (7,844)
Foreign currency translation adjustments	(1,450)	2,103
Accumulated other comprehensive loss	(1,259)	(5,741)
Accumulated other comprehensive income loss available for sale securities adjustment tax	$ (14)	$ 5,005

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

Marketable Securities and Investments (Narrative) (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jul. 31, 2010 USD ($)	Dec. 31, 2011 USD ($) months	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of months investment-related assets have been in a continuous loss position \| months		12
Auction rate securities repurchased	$ 30,500
Estimated aggregate loss related to impairment of auction rate securities included in accumulated other comprehensive income loss			$ 13,500
Recorded net losses on investments		$ (249)	396	$ 785
Gain on investment of marketable securities			400	$ 800
Available-for-sale securities		$ 670,758	1,011,536
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Loss on sale of securities			9,600
Available-for-sale securities			$ 137,256

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References + Details

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(c),9(a))
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (c)-(e)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27405-111563

+ Details

Marketable Securities and Investments (Marketable Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, cost	$ 670,552	$ 1,024,385
Gross unrealized gains	951	1,552
Gross unrealized losses	(745)	(14,401)
Aggregate fair value	670,758	1,011,536
Short-term marketable securities	290,029	375,005
Long-term marketable securities	380,729	636,531
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, cost	42	96
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Aggregate fair value	42	96
Short-term marketable securities	0	51
Long-term marketable securities	42	45
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, cost		59,912
Gross unrealized gains		34
Gross unrealized losses		(2)
Aggregate fair value		59,944
Short-term marketable securities		59,944
Long-term marketable securities		0
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, cost	524,515	651,855
Gross unrealized gains	873	1,416
Gross unrealized losses	(580)	(736)
Aggregate fair value	524,808	652,535
Short-term marketable securities	285,012	301,625
Long-term marketable securities	239,796	350,910
U.S. Government Agencies Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, cost	145,995	161,722
Gross unrealized gains	78	102
Gross unrealized losses	(165)	(119)
Aggregate fair value	145,908	161,705
Short-term marketable securities	5,017	13,385
Long-term marketable securities	$ 140,891	148,320
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, cost		150,800
Gross unrealized gains		0
Gross unrealized losses		(13,544)
Aggregate fair value		137,256
Short-term marketable securities		0
Long-term marketable securities		$ 137,256

Marketable Securities and Investments (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 670,758	$ 1,011,536
Total Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments and cash equivalents	1,030,763	1,067,184
Total Fair Value [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	302,507	55,648
Total Fair Value [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	42	96
Total Fair Value [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	57,498	59,944
Total Fair Value [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	145,908	161,705
Total Fair Value [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	524,808	652,535
Total Fair Value [Member] \| Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		137,256
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments and cash equivalents	302,549	55,744
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	302,507	55,648
Level 1 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	42	96
Level 1 [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 1 [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 1 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 1 [Member] \| Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments and cash equivalents	728,214	874,184
Level 2 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level 2 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 2 [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	57,498	59,944
Level 2 [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	145,908	161,705
Level 2 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	524,808	652,535
Level 2 [Member] \| Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments and cash equivalents	0	137,256
Level 3 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level 3 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 3 [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 3 [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 3 [Member] \| Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	0
Level 3 [Member] \| Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		$ 137,256

Marketable Securities and Investments (Schedule of Activity of Major Classes of Assets Measured at Fair Value Using Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 137,256	$ 254,119
Redemptions of securities		(124,100)
Unrealized gains included in accumulated other comprehensive income (loss), net		7,237
Realized gain on auction rate securities included in the statement of operations		9,614
Realized loss on other investment-related assets included in the statement of operations		(9,614)
Ending balance		137,256
Put Option Related to Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	9,614
Redemptions of securities		0
Unrealized gains included in accumulated other comprehensive income (loss), net		0
Realized gain on auction rate securities included in the statement of operations		0
Realized loss on other investment-related assets included in the statement of operations		(9,614)
Ending balance		0
Auction Rate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	137,256	244,505
Redemptions of securities	(137,256)	(124,100)
Unrealized gains included in accumulated other comprehensive income (loss), net		7,237
Realized gain on auction rate securities included in the statement of operations		9,614
Realized loss on other investment-related assets included in the statement of operations		0
Ending balance	$ 0	$ 137,256

Marketable Securities and Investments (Schedule of Contractual Maturities of Marketable Securities and Other Investment Related Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Marketable Securities [Abstract]
Available-for-sale securities due in 1 year or less	$ 290,029	$ 375,005
Available-for-sale securities due after 1 year through 5 years	380,729	499,275
Available-for-sale securities due after 5 years	0	137,256
Total Available-for-sale securities	$ 670,758	$ 1,011,536

- Definition

+ References + Details

Accounts Receivable (Schedule of Accounts Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 215,491	$ 180,598
Allowance for doubtful accounts	(1,627)	(1,329)
Reserve for cash-basis customers	(2,928)	(3,903)
Total accounts receivable reserves	(4,555)	(5,232)
Accounts receivable, net	210,936	175,366
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	142,166	116,212
Unbilled Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 73,325	$ 64,386

Property and Equipment (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property and Equipment [Abstract]
Property, software and equipment depreciation, amortization expense	$ 150.8	$ 126.6	$ 105.8
Impairment of long-lived assets held-for-use	61.7	14.9
Long lived asset depreciation and amortization	59.9	14.5
Payroll and consulting fees for software	42.6	32.8	27.2
Non-cash stock based compensation	7.5	7.8	$ 6.3
Write-off of internal use software costs	4.6	2.3
Internal-use software write-offs, accumulated depreciation	$ 3.9	$ 2.3

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 26
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 7, 25
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6743430&loc=d3e92212-112881

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Impairment
-URI http://asc.fasb.org/extlink&oid=6515133

+ Details

Property and Equipment (Schedule of Property and Equipment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2011 USD ($) years	Dec. 31, 2010 USD ($)
Property, Plant and Equipment [Line Items]
Computer and networking equipment	$ 561,952	$ 492,685
Purchased software	31,388	29,885
Furniture and fixtures	14,166	12,770
Office equipment	5,676	4,792
Leasehold improvements	36,358	29,914
Internal-use software	222,914	177,918
Property and equipment, gross	872,454	747,964
Accumulated depreciation and amortization	(579,411)	(492,035)
Property and equipment, net	$ 293,043	$ 255,929
Property, plant and equipment, useful life, minimum \| years	1
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, average \| years	3
Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, average \| years	3
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, average \| years	5
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, average \| years	3
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, minimum \| years	2
Property, plant and equipment, useful life, maximum \| years	12
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, average \| years	2

Property and Equipment (Schedule of Capitalized Internal-Use Software Costs) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Property and Equipment [Abstract]
Gross costs capitalized	$ 230,938	$ 181,376
Less: cumulative impairments	(8,024)	(3,458)
Gross costs capitalized, excluding cumulative impairments	222,914	177,918
Less: accumulated amortization	(152,140)	(117,936)
Net book value of capitalized internal-use software	$ 70,774	$ 59,982

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2010
Business Acquisition [Line Items]
Amortization of other intangible assets	$ 17,070	$ 16,657	$ 16,722
Future Amortization Expense 2012	16,600
Future amortization expense 2013	13,200
Future amortization expense 2014	7,200
Future amortization expense 2015	4,600
Future amortization expense 2016	$ 2,100
Velocitude [Member]
Business Acquisition [Line Items]
Goodwill		11,600		$ 11,600
Identifiable intangible assets		$ 2,800		$ 2,800

Goodwill and Other Intangible Assets (Schedule of the Changes in the Carrying Amount of Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2010 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 441,347
Purchase price adjustment in connection with the acerno acquisition	11,567
Ending balance	$ 452,914

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Goodwill and Other Intangible Assets (Schedule of Other Intangible Assets) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2011 USD ($) years	Dec. 31, 2010 USD ($) years
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 135,061	$ 135,061
Accumulated Amortization	(89,675)	(72,605)
Net Carrying Amount	45,386	62,456
Completed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	36,731	36,731
Accumulated Amortization	(22,913)	(16,520)
Net Carrying Amount	$ 13,818	$ 20,211
Weighted Average Amortization Period (in years) \| years	6	6
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 88,700	$ 88,700
Accumulated Amortization	(60,202)	(50,832)
Net Carrying Amount	$ 28,498	$ 37,868
Weighted Average Amortization Period (in years) \| years	9	9
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,340	$ 8,340
Accumulated Amortization	(5,270)	(4,070)
Net Carrying Amount	$ 3,070	$ 4,270
Weighted Average Amortization Period (in years) \| years	4	4
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 800	$ 800
Accumulated Amortization	(800)	(693)
Net Carrying Amount	$ 0	$ 107
Weighted Average Amortization Period (in years) \| years	4	4
Acquired License Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 490	$ 490
Accumulated Amortization	(490)	(490)
Net Carrying Amount	$ 0	$ 0
Weighted Average Amortization Period (in years) \| years	10	10

Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 39,920	$ 51,591
Bandwidth and co-location	29,291	21,787
Property, use and other taxes	9,923	15,849
Professional service fees	4,162	2,678
Contingent consideration	0	990
Other	2,075	1,766
Total	$ 85,371	$ 94,661

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

+ Details

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References + Details

Commitments, Contingencies and Guarantees (Minimum Aggregate Future Obligations Under Non-cancelable Leases) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Commitments Contingencies and Guarantees [Abstract]
2012	$ 23,360
2013	21,750
2014	20,544
2015	19,116
2016	14,343
Thereafter	39,644
Total	138,757
Rent expense	23,000	$ 23,600	$ 19,800
Proceeds from sublease tennants	$ 800	$ 3,300	$ 1,600

Commitments, Contingencies and Guarantees (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Letters of credit for real estate leases	$ 5.5
Bandwidth and purchase order commitments
2012	56.0
Bandwidth Usage And Co Location Services [Member]
Bandwidth and purchase order commitments
2012	88.8
2013	12.8
2014	0.7
2015	$ 0.1

1% Convertible Senior Notes (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended		2 Months Ended	12 Months Ended
	Jan. 31, 2004 USD ($) $ / shares shares	Dec. 31, 2003 USD ($) $ / shares shares	Jan. 31, 2004 USD ($) shares	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($) years shares	Dec. 31, 2009 USD ($)
1% Convertible Senior Notes [Abstract]
Aggregate principal amount issued of 1% convertible senior notes	$ 200,000	$ 200,000	$ 200,000
Interest rate of convertible note 1.00%					1.00%
Maturity Date					Dec. 15, 2033
Aggregate proceeds from issuance of 1% convertible senior notes			194,100
Total deferred financing costs related to the 1% convertible senior notes	$ 5,900	$ 5,900	$ 5,900
Initial conversion price of 1% convertible senior notes (price per share) \| $ / shares	$ 15.45	$ 15.45
Number of common stock shares equivalent per $1,000 principal amount of 1% convertible senior notes \| shares	64.7249	62.7249	64.7249
Number of common stock shares issued in connection with conversion of 1% convertible senior notes \| shares					12,929,095
Value of 1% convertible senior notes converted during the period					$ 199,800
Period deferred financing costs of convertible senior notes are amortized (in years) \| years					7
Amortization of deferred financing costs				$ 0	$ 507	$ 840

Restructurings and Lease Terminations (Narrative) (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2008 USD ($)	Nov. 30, 2008 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Restructuring Cost and Reserve [Line Items]
Accrued restructuring liability	$ 3,900	$ 1,700		$ 3,900	$ 300	$ 800
Number of employees in workforce reduction	70		110
Restructuring charge				4,886	0	454
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge	$ 4,200		$ 2,000
Non-Cash Stock-Based Compensation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charge	400		$ (800)
Leases [Member]
Restructuring Cost and Reserve [Line Items]
Accrued restructuring liability	600	300		600	$ 0	100
Restructuring charge	$ 700	$ 500		$ 700		$ 0

Restructurings and Lease Terminations (Schedule of Accrual and Usage of Restructuring Charges) (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2008	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Reserve [Roll Forward]
Beginning balance			$ 300	$ 800	$ 1,700
Restructuring charge			4,886	0	454
Cash payments			(1,300)	(500)	(1,400)
Ending balance	$ 3,900	$ 1,700	3,900	300	800
Current portion of accrued restructuring	3,430		3,430	307
Long-term portion of accrued restructuring	500		500
Leases [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			0	100	300
Restructuring charge	700	500	700		0
Cash payments			(100)	(100)	(200)
Ending balance	600	300	600	0	100
Current portion of accrued restructuring	100		100
Long-term portion of accrued restructuring	500		500
Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning balance			300	700	1,400
Restructuring charge			4,200		500
Cash payments			(1,200)	(400)	(1,200)
Ending balance	3,300	$ 1,400	3,300	$ 300	$ 700
Current portion of accrued restructuring	3,300		3,300
Long-term portion of accrued restructuring	$ 0		$ 0

- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References + Details

- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References + Details

Rights Plan and Series A Junior Participating Preferred Stock (Narrative) (Details) - $ / shares	Dec. 31, 2011	Dec. 31, 2010	Jan. 31, 2004	Sep. 10, 2002
Rights Plan and Series A Junior Participating Preferred Stock [Abstract]
Preferred stock, shares designated as Series A Junior Participating Preferred Stock	700,000	700,000		700,000
Preferred stock, shares authorized	5,000,000	5,000,000		5,000,000
Preferred stock, par value per share	$ 0.01	$ 0.01		$ 0.01
Per share price for registered holders				$ 9.00
Amendment to rights plan per share purchase price			$ 65.00

Stockholders' Equity Note (Details) - USD ($) $ in Thousands	1 Months Ended				12 Months Ended
	Aug. 31, 2011	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity Note [Abstract]
Number of votes per share of common stock					1
Number of shares of common stock available for issuance					8,200,000
Amount of common stock repurchases authorized	$ 400,000			$ 100,000
Increase in stock repurchase authorized amount	$ 250,000	$ 150,000	$ 150,000
Value of shares repurchased during period					$ 324,733	$ 91,960	$ 66,301
Remaining amount available for future purchases of shares under approved repurchase program.					$ 129,700
Common Stock [Member]
Treasury Stock, Shares, Acquired					12,276,878	2,452,595	3,327,146

- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References + Details

Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2002 shares	Dec. 31, 2011 USD ($) years $ / shares shares	Dec. 31, 2010 USD ($) $ / shares shares	Dec. 31, 2009 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation pre-tax unrecognized compensation cost		$ 110.9
Weighted average period for recognizing compensation cost, in years		1.3
Income tax benefits realized from exercise of stock options and vesting of stock units and deferred stock units		$ 79.0	$ 123.5	$ 68.0
End of year stock price \| $ / shares		$ 32.28
In the money options exercisable \| shares		4,700,000
1998 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock approved for issuance under plan \| shares		48,300,000
Exercise price of incentive stock options percentage of fair market value, minimum		100.00%
Exercise price of incentive stock options percentage of fair market value, minimum in certain cases		110.00%
Stock option vesting period, in years		4 years
Term of options granted, maximum period in years \| years		10
Term of incentive options granted, maximum period, in years \| years		5
Voting stock minimum percentage before applying incentive stock granted term limits		10.00%
2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock approved for issuance under plan \| shares		5,000,000
Stock option vesting period, in years		4 years
Term of options granted, maximum period in years \| years		10
Term of incentive options granted, maximum period, in years \| years		5
Voting stock minimum percentage before applying incentive stock granted term limits		10.00%
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock approved for issuance under plan \| shares		7,500,000
Exercise price of incentive stock options percentage of fair market value, minimum		100.00%
Exercise price of incentive stock options percentage of fair market value, minimum in certain cases		110.00%
Stock option vesting period, in years		4 years
Term of options granted, maximum period in years \| years		7
2009 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock approved for issuance under plan \| shares		8,500,000
Exercise price of incentive stock options percentage of fair market value, minimum		100.00%
Exercise price of incentive stock options percentage of fair market value, minimum in certain cases		110.00%
Stock option vesting period, in years		4 years
Term of options granted, maximum period in years \| years		7
Stock Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of stock options granted \| $ / shares		$ 14.93	$ 16.49	$ 8.44
Total pre-tax intrinsic value of options exercised		$ 22.6	$ 67.5	$ 11.2
Total fair value of vested options		14.8	14.6	18.2
Proceeds from stock options exercised		$ 12.6	$ 33.6	$ 11.9
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of equity instruments other than options granted \| $ / shares		$ 32.48	$ 39.95	$ 21.56
Each DSU receives this number of shares of common stock upon vesting		1
Holder elect to defer vested shares period, minimum in years \| years		1
Holder elect to defer vested shares period, maximum in years \| years		10
The amount typically vested by anniversary grant date, percentage		50.00%
Equal installment percentage for remaining DSUs to be vested in two years from grant date		12.50%
Number of years from date of grant DSUs are fully vested		2
Director's minimum period of service before vesting accelerates, in years		1
Director's vesting before acceleration after departure, percentage		100.00%
Total pre-tax intrinsic value end of year		$ 0.5	$ 3.0	$ 0.4
Total fair value of vested and distributed		$ 0.5	$ 1.4	$ 0.6
Unvested Deferred Stock Units \| shares		68,583
Aggregate instrinsic value		$ 2.2
Weighted average contractual remaining life, in years		1.2
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of equity instruments other than options granted \| $ / shares		$ 33.75	$ 26.56	$ 18.73
Total pre-tax intrinsic value end of year		$ 68.0	$ 72.0	$ 55.9
Total fair value of vested and distributed		$ 44.7	$ 47.2	$ 92.6
Number of equity instruments other than options unnvested \| shares		6,500,000
Aggregate instrinsic value		$ 181.9
Weighted average contractual remaining life, in years		1.6
Each RSU receives this number of shares of common stock upon vesting		1
Restricted stock unit vesting provision, minimum in years		3
Restricted stock unit vesting provision, maximum in years		4
1999 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock approved for issuance under plan \| shares		3,100,000
Maximum amount of shares available for issuance \| shares	1,500,000
Aggregate amount of shares available, maximum \| shares	20,000,000
Discount on fair market value for purchase of stock, percentage		15.00%
Issuance of common stock under employee stock purchase plan, shares \| shares		500,000	500,000	700,000
Weighted average purchase price \| $ / shares		$ 25.75	$ 25.62	$ 13.47
Total cash proceeds from shares purchased		$ 12.7	$ 12.2	$ 9.8
Amount withheld from employees for future purchases		$ 1.4
Weighted average fair value of equity instruments other than options granted \| $ / shares		$ 10.24	$ 9.86	$ 4.11
Capitalized Internal Use Software [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional stock based compensation		$ 7.3	$ 7.5	$ 6.4

Stock-Based Compensation (Schedule of Stock Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 61,305	$ 76,468	$ 58,797
Less: Income tax benefit	(21,212)	(26,566)	(22,633)
Provision for income taxes	(21,212)	(26,566)	(22,633)
Total stock-based compensation, net of taxes	40,093	49,902	36,164
Stock Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	13,533	15,154	17,636
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1,885	1,885	2,085
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	47,807	62,928	41,584
1999 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	5,553	4,319	3,772
Capitalized Internal Use Software [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	7,473	7,818	6,280
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	2,360	2,806	2,195
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	11,125	14,539	10,967
Sales and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	27,990	35,525	27,411
General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	$ 19,830	$ 23,598	$ 18,224

Stock-Based Compensation (Schedule of Stock Options Granted Black Scholes) (Details) - Stock Based Options [Member] - years	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Expected life (years)	4.2	4.2	4.1
Risk free interest rate (%)	1.30%	1.40%	1.70%
Expected volatility (%)	48.90%	50.90%	54.80%
Dividend yield (%)	0.00%	0.00%	0.00%

Stock-Based Compensation (Schedule of ESPP Granted Black Scholes) (Details) - 1999 ESPP [Member] - years	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Expected life (years)	0.5	0.5	0.5
Risk free interest rate (%)	0.10%	0.20%	0.40%
Expected volatility (%)	43.70%	51.20%	69.20%
Dividend yield (%)	0.00%	0.00%	0.00%

Stock-Based Compensation (Schedule of Summary of Stock Option Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding beginning balance	8,946	10,022	10,380
Outstanding beginning weighted average exercise price	$ 23.63	$ 19.34	$ 18.76
Granted	656	1,577	1,146
Granted weighted average exercise price	$ 37.33	$ 39.72	$ 19.11
Exercised	(1,044)	(2,366)	(1,178)
Exercised weighted average exercise price	$ 12.09	$ 14.21	$ 10.09
Forfeited and expired	(541)	(287)	(326)
Forfeited and expired weighted average price	$ 43.96	$ 39.69	$ 33.68
Outstanding ending balance	8,017	8,946	10,022
Outstanding ending weighted average exercise price	$ 24.89	$ 23.63	$ 19.34
Exercisable ending balance	6,247
Exercisable ending weighted average price	$ 22.54
Stock Based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding ending balance	8,017

Stock-Based Compensation (Schedule of Stock Options Outstanding Expected to Vest and Exercisable) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2011 USD ($) years $ / shares shares	Dec. 31, 2010 shares	Dec. 31, 2009 shares	Dec. 31, 2008 shares
Total options outstanding \| shares	8,017	8,946	10,022	10,380
Stock Based Options [Member]
Number of Options (in thousands) \| shares	7,932
Weighted Average Remaining Contractual Life (in years) \| years	4.0
Weighted Average Exercise Price	$ 24.74
Aggregate Intrinsic Value (in thousands) \| $	$ 88,887
Exercisable Number of Options (in thousands) \| shares	6,247
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	3.5
Exercisable Weighted Average Exercise Price	$ 22.54
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 81,042
Expected forfeitures \| shares	85
Total options outstanding \| shares	8,017
Stock Based Options [Member] \| Range Of Exercise Prices $0.31To $0.49 [Member]
Number of Options (in thousands) \| shares	43
Weighted Average Remaining Contractual Life (in years) \| years	2.2
Weighted Average Exercise Price	$ 0.31
Aggregate Intrinsic Value (in thousands) \| $	$ 1,366
Exercisable Number of Options (in thousands) \| shares	43
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	2.2
Exercisable Weighted Average Exercise Price	$ 0.31
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 1,366
Exercise price range, lower limit	$ 0.31
Exercise price range, upper limit	$ 0.49
Stock Based Options [Member] \| Range Of Exercise Prices $0.89 To $1.33 [Member]
Number of Options (in thousands) \| shares	249
Weighted Average Remaining Contractual Life (in years) \| years	0.7
Weighted Average Exercise Price	$ 0.91
Aggregate Intrinsic Value (in thousands) \| $	$ 7,816
Exercisable Number of Options (in thousands) \| shares	248
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	0.7
Exercisable Weighted Average Exercise Price	$ 0.91
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 7,782
Exercise price range, lower limit	$ 0.89
Exercise price range, upper limit	$ 1.33
Stock Based Options [Member] \| Range Of Exercise Prices $1.40 To $1.65 [Member]
Number of Options (in thousands) \| shares	170
Weighted Average Remaining Contractual Life (in years) \| years	1.0
Weighted Average Exercise Price	$ 1.62
Aggregate Intrinsic Value (in thousands) \| $	$ 5,217
Exercisable Number of Options (in thousands) \| shares	170
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	1.0
Exercisable Weighted Average Exercise Price	$ 1.62
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 5,217
Exercise price range, lower limit	$ 1.40
Exercise price range, upper limit	$ 1.65
Stock Based Options [Member] \| Range Of Exercise Prices $2.27 To $3.33 [Member]
Number of Options (in thousands) \| shares	64
Weighted Average Remaining Contractual Life (in years) \| years	0.9
Weighted Average Exercise Price	$ 2.84
Aggregate Intrinsic Value (in thousands) \| $	$ 1,871
Exercisable Number of Options (in thousands) \| shares	64
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	0.9
Exercisable Weighted Average Exercise Price	$ 2.84
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 1,871
Exercise price range, lower limit	$ 2.27
Exercise price range, upper limit	$ 3.33
Stock Based Options [Member] \| Range Of Exercise Prices $3.71 To $5.56 [Member]
Number of Options (in thousands) \| shares	448
Weighted Average Remaining Contractual Life (in years) \| years	1.5
Weighted Average Exercise Price	$ 4.89
Aggregate Intrinsic Value (in thousands) \| $	$ 12,272
Exercisable Number of Options (in thousands) \| shares	446
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	1.5
Exercisable Weighted Average Exercise Price	$ 4.89
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 12,235
Exercise price range, lower limit	$ 3.71
Exercise price range, upper limit	$ 5.56
Stock Based Options [Member] \| Range Of Exercise Prices $8.28 To $12.26 [Member]
Number of Options (in thousands) \| shares	375
Weighted Average Remaining Contractual Life (in years) \| years	3.1
Weighted Average Exercise Price	$ 12.10
Aggregate Intrinsic Value (in thousands) \| $	$ 7,579
Exercisable Number of Options (in thousands) \| shares	375
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	3.1
Exercisable Weighted Average Exercise Price	$ 12.10
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 7,576
Exercise price range, lower limit	$ 8.28
Exercise price range, upper limit	$ 12.26
Stock Based Options [Member] \| Range Of Exercise Prices $12.76 To $19.07 [Member]
Number of Options (in thousands) \| shares	2,444
Weighted Average Remaining Contractual Life (in years) \| years	3.5
Weighted Average Exercise Price	$ 15.30
Aggregate Intrinsic Value (in thousands) \| $	$ 41,506
Exercisable Number of Options (in thousands) \| shares	2,183
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	3.4
Exercisable Weighted Average Exercise Price	$ 15.60
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 37,588
Exercise price range, lower limit	$ 12.76
Exercise price range, upper limit	$ 19.07
Stock Based Options [Member] \| Range Of Exercise Prices $19.21 To $28.38 [Member]
Number of Options (in thousands) \| shares	1,403
Weighted Average Remaining Contractual Life (in years) \| years	5.0
Weighted Average Exercise Price	$ 24.67
Aggregate Intrinsic Value (in thousands) \| $	$ 10,678
Exercisable Number of Options (in thousands) \| shares	914
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	4.6
Exercisable Weighted Average Exercise Price	$ 24.56
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 7,054
Exercise price range, lower limit	$ 19.21
Exercise price range, upper limit	$ 28.38
Stock Based Options [Member] \| Range Of Exercise Prices $29.36 To $43.99 [Member]
Number of Options (in thousands) \| shares	1,532
Weighted Average Remaining Contractual Life (in years) \| years	5.7
Weighted Average Exercise Price	$ 36.34
Aggregate Intrinsic Value (in thousands) \| $	$ 582
Exercisable Number of Options (in thousands) \| shares	866
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	5.6
Exercisable Weighted Average Exercise Price	$ 34.40
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 353
Exercise price range, lower limit	$ 29.36
Exercise price range, upper limit	$ 43.99
Stock Based Options [Member] \| Range Of Exercise Prices $44.27 To $56.60 [Member]
Number of Options (in thousands) \| shares	1,204
Weighted Average Remaining Contractual Life (in years) \| years	4.2
Weighted Average Exercise Price	$ 50.81
Aggregate Intrinsic Value (in thousands) \| $	$ 0
Exercisable Number of Options (in thousands) \| shares	938
Exercisable Weighted Average Remaining Contractual Life (in years) \| years	3.7
Exercisable Weighted Average Exercise Price	$ 51.43
Exercisable Aggregate Intrinsic Value (in thousands) \| $	$ 0
Exercise price range, lower limit	$ 44.27
Exercise price range, upper limit	$ 56.60

Stock-Based Compensation (Schedule of Deferred Stock Units Activity) (Details) - Deferred Stock Units [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Outstanding beginning balance	257	287	207
Outstanding beginning weighted average grant date fair value	$ 25.31	$ 21.04	$ 24.86
Granted	58	47	97
Granted weighted average grant date fair value	$ 32.48	$ 39.95	$ 21.56
Exercised	(15)	(77)	(17)
Vested and distributed weighted average grant date fair value	$ 33.78	$ 18.40	$ 33.07
Forfeited	(1)
Forfeited weighted average grant date fair value	$ 39.95
Outstanding ending balance	299	257	287
Outstanding ending weighted average grant date fair value	$ 26.25	$ 25.31	$ 21.04

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References + Details

Stock-Based Compensation (Schedule of Restricted Stock Units by Type) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total restricted stock units vesting conditions granted	3,553	2,721	4,316
Restricted Stock Units Service Based [Member]
Restricted stock units vesting conditions granted	3,003	1,597	2,342
Restricted Stock Units Performance Based [Member]
Restricted stock units granted with performance based vesting	550	1,124	1,974

Stock-Based Compensation (Schedule of Restricted Stock Units Activity) (Details) - Restricted Stock Units [Member] - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Outstanding beginning balance	6,207	6,863	6,199
Outstanding beginning weighted average grant date fair value	$ 23.76	$ 27.63	$ 34.64
Granted	3,553	2,721	4,316
Granted weighted average grant date fair value	$ 33.75	$ 26.56	$ 18.73
Exercised	(1,931)	(1,971)	(3,282)
Exercised weighted average grant date fair value	$ 23.15	$ 23.97	$ 28.20
Forfeited	(1,312)	(1,406)	(370)
Forfeited weighted average grant date fair value	$ 30.62	$ 47.47	$ 25.99
Outstanding ending balance	6,517	6,207	6,863
Outstanding ending weighted average grant date fair value	$ 27.95	$ 23.76	$ 27.63

- Definition

+ References + Details

Employee Benefit Plan (Narrative) (Details) - USD ($)	1 Months Ended		12 Months Ended
Employee Benefit Plan (Narrative) (Details) - USD ($)	Jan. 31, 2012	Jan. 31, 2008	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Benefit Plan [Abstract]
Employee benefit plan				$ 3,400,000	$ 2,600,000	$ 1,900,000
Percentage of company match that vests annually				25.00%
Subsequent Event [Line Items]
Employee benefit plan, amended matching contribution		1/2
Percentage of employee contribution matched by the company		8.00%
Maximum amount that company will match annually per employee (whole number)				$ 2,000	$ 2,000	$ 2,000
Employee Benefit Plan [Member]
Subsequent Event [Line Items]
Employee benefit plan, amended matching contribution	1/2
Percentage of employee contribution matched by the company	8.00%
Maximum amount that company will match annually per employee (whole number)			$ 4,000

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Alternative minimum tax carryforward		$ 10.9
Valuation allowance on NOL and capital loss carryforwards	$ 0.4	7.4
Undistributed foreign earnings	82.9
Unrecognized tax benefits including accrued interest and penalties	17.2	15.1
Accrued interest and penalties	4.7	4.3
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		8.8
Research and development tax credit carryforwards	6.5	19.8
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	51.4	61.3
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 0.7	1.1
Research and development tax credit carryforwards		$ 4.3

Income Taxes Income Taxes (Components of Income Tax Schedule) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Domestic	$ 257,656	$ 235,892	$ 221,071
Foreign	49,539	26,480	16,161
Income before provision for income taxes	$ 307,195	$ 262,372	$ 237,232

Income Taxes Income Taxes (Provision for Income Tax Schedule) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current tax provision
Federal	$ 39,517	$ 19,619	$ 1,393
State	2,953	4,993	4,229
Foreign	10,193	4,078	3,991
Deferred tax provision (benefit)
Federal	54,980	55,335	76,410
State	4,413	2,393	2,068
Foreign	1,209	4,269	3,238
Change in valuation allowance	(6,974)	465	(10)
Income Tax Expense (Benefit)	$ 106,291	$ 91,152	$ 91,319

Income Taxes Income Taxes (Schedule of Difference Between Effective and Statutory) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
United States federal income tax rate	35.00%	35.00%	35.00%
State taxes	2.80%	2.90%	3.70%
Nondeductible stock-based compensation	0.80%	0.10%	1.20%
United States federal and state research and development credits	(2.40%)	(2.60%)	(1.40%)
Change in state tax rates	(0.10%)	0.50%	0.00%
Foreign earnings	(2.20%)	(0.40%)	0.10%
Expiration of capital loss carryforward	2.10%	0.00%	0.00%
Other	0.90%	(1.00%)	(0.10%)
Change in the deferred tax asset valuation allowance	(2.30%)	0.20%	0.00%
Effective Income Tax Rate, Continuing Operations	34.60%	34.70%	38.50%

Income Taxes Income Taxes (Schedule of Deferred Tax and Related Valuation Allowance) (Details) - USD ($) $ in Thousands	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Net operating loss and credit carryforwards	$ 9,323	$ 35,202
Depreciation and amortization	30,702	60,935
Compensation costs	35,959	32,221
Impairment loss on marketable securities	0	5,005
Other	15,530	20,782
Deferred tax assets	91,514	154,145
Acquired intangible assets not deductible	(16,972)	(22,784)
Internal-use software capitalized	(24,165)	(20,527)
Impairment loss on marketable securities	(15)	0
Deferred tax liabilities	(41,152)	(43,311)
Valuation allowance	(433)	(7,407)
Net deferred tax assets	$ 49,929	$ 103,427

Income Taxes Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Unrecognized tax benefits — at beginning of year	$ 10.8	$ 7.0
Gross increases — tax positions of prior periods	0.0	1.5
Gross increases — current-period tax positions	2.8	2.3
Gross decreases — tax positions of prior periods	(0.8)	0.0
Gross decreases — settlements	(0.3)	0.0
Unrecognized tax benefits — at end of year	$ 12.5	$ 10.8

Segment and Geographic Information (Details) $ in Thousands	12 Months Ended
Segment and Geographic Information (Details) $ in Thousands	Dec. 31, 2011 USD ($) countries	Dec. 31, 2010 USD ($) countries	Dec. 31, 2009 countries
Segment Reporting Information [Line Items]
Property and equipment, net	$ 293,043	$ 255,929
Revenues derived from Europe	29.00%	28.00%	28.00%
Revenues from outside of the United States	18.00%	17.00%	18.00%
Number of foreign countries greater than 10% revenue \| countries	0	0	0
Max amount percentage of revenue for single country	10.00%
United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 194,000	$ 174,900
Foreign Locations [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 99,000	$ 81,000

Quarterly Financial Results (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Financial Results (unaudited) [Abstract]
Revenues	$ 323,740	$ 281,856	$ 276,989	$ 275,953	$ 284,688	$ 253,551	$ 245,318	$ 240,029	$ 1,158,538	$ 1,023,586	$ 859,773
Cost of revenues	102,544	93,284	89,647	89,068	86,277	77,812	71,840	67,474	374,543	303,403	249,938
Net income	$ 60,081	$ 42,285	$ 47,921	$ 50,617	$ 52,510	$ 39,709	$ 38,123	$ 40,878	$ 200,904	$ 171,220	$ 145,913
Basic net income per share	$ 0.34	$ 0.23	$ 0.26	$ 0.27	$ 0.29	$ 0.22	$ 0.22	$ 0.24
Diluted net income per share	$ 0.33	$ 0.23	$ 0.25	$ 0.26	$ 0.27	$ 0.21	$ 0.20	$ 0.22
Basic	178,916	183,085	186,612	186,849	183,362	181,457	173,317	171,101	183,866	177,309	171,425
Diluted	182,956	185,704	190,179	191,383	191,837	191,271	190,479	189,013	187,556	190,650	188,658

- Definition

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
-Subparagraph (SX 210.9-04.23)
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 11, 12, 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
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-Paragraph 1
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-Subparagraph (SX 210.5-03.21)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e565-108580

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Dec. 31, 2009

Reserves for Accounts Receivable [Member]

Movement in Valuation Allowances and Reserves [Roll Forward]

Balance at beginning of period

$ 5,232

$ 10,579

$ 11,270

Charged to operations

^[1]

16,165

22,657

21,566

Other

^[2]

(420)

(301)

(716)

Deductions

^[3]

(16,422)

(27,703)

(21,541)

Balance at end of period

4,555

5,232

10,579

Deferred Tax Asset Valuation Allowance [Member]

Movement in Valuation Allowances and Reserves [Roll Forward]

Balance at beginning of period

7,407

7,086

7,096

Charged to operations

(6,974)

^[4]

465

(10)

Other

Deductions

(144)

Balance at end of period

$ 433

$ 7,407

$ 7,086

[1]	Amounts represent charges to bad debt expense and reductions to revenue for increases to the allowance for doubtful accounts and to the reserve for cash-basis customers.
[2]	Amounts represent write-offs of account receivables previously reserved.
[3]	Amounts represent cash collections from customers for accounts previously reserved and write-offs of accounts receivable recorded against the allowance for doubtful accounts or the reserve for cash-basis customers.
[4]	Amount represents the reversal of a tax valuation allowance related to NOL carryforwards not expected to be realized.