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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2013	Aug. 06, 2013
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Entity Registrant Name	AKAMAI TECHNOLOGIES INC
Entity Central Index Key	0001086222
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		178,158,848

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents (including restricted cash of $200 at December 31, 2012)	$ 204,865	$ 201,989
Marketable securities (including restricted securities of $222 and $57 at June 30, 2013 and December 31, 2012, respectively)	326,077	235,592
Accounts receivable, net of reserves of $4,632 and $3,807 at June 30, 2013 and December 31, 2012, respectively	237,286	218,777
Prepaid expenses and other current assets	70,734	51,604
Deferred income tax assets	20,422	20,422
Total current assets	859,384	728,384
Property and equipment, net	405,653	345,091
Marketable securities (including restricted securities of $50 and $43 at June 30, 2013 and December 31, 2012, respectively)	587,470	657,659
Goodwill	729,386	731,325
Acquired intangible assets, net	68,562	84,554
Deferred income tax assets	14,527	13,803
Other assets	60,288	39,811
Total assets	2,725,270	2,600,627
Current liabilities:
Accounts payable	50,370	43,291
Accrued expenses and other current liabilities	143,652	133,087
Deferred revenue	32,019	26,291
Accrued restructuring	533	275
Total current liabilities	226,574	202,944
Other liabilities	47,928	49,364
Deferred revenue	2,895	2,565
Total liabilities	277,397	254,873
Commitments, contingencies and guarantees (Note 15)
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; 202,712,865 shares issued and 178,115,006 shares outstanding at June 30, 2013 and 200,199,536 shares issued and 177,782,814 shares outstanding at December 31, 2012	2,045	2,015
Additional paid-in capital	5,256,348	5,195,543
Accumulated other comprehensive loss	(10,955)	(1,640)
Treasury stock, at cost, 24,597,859 shares at June 30, 2013 and 22,416,722 shares at December 31, 2012	(707,245)	(624,462)
Accumulated deficit	(2,092,320)	(2,225,702)
Total stockholders’ equity	2,447,873	2,345,754
Total liabilities and stockholders’ equity	$ 2,725,270	$ 2,600,627

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Restricted cash (in dollars)	$ 0	$ 200
Restricted marketable securities, current (in dollars)	222	57
Accounts receivable reserve (in dollars)	4,632	3,807
Restricted marketable securities, noncurrent (in dollars)	$ 50	$ 43
Preferred stock, par value (in dollars per share)	$ 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 (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	700,000,000	700,000,000
Common stock, shares issued	202,712,865	200,199,536
Common stock, shares outstanding	178,115,006	177,782,814
Treasury stock, shares	24,597,859	22,416,722

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues	$ 378,106	$ 331,306	$ 746,152	$ 650,754
Costs and operating expenses:
Cost of revenues	124,705	131,260	245,097	256,185
Research and development	20,597	17,542	42,502	35,022
Sales and marketing	67,825	56,480	130,515	105,475
General and administrative	61,351	53,596	116,731	105,238
Amortization of acquired intangible assets	5,734	5,463	11,794	10,230
Restructuring charge (benefit)	391	(46)	822	14
Total costs and operating expenses	280,603	264,295	547,461	512,164
Income from operations	97,503	67,011	198,691	138,590
Interest income	1,446	1,622	3,002	3,255
Other income, net	341	1,131	209	690
Gain on investments, net	31	4	83	17
Income before provision for income taxes	99,321	69,768	201,985	142,552
Provision for income taxes	37,426	25,529	68,603	55,086
Net income	$ 61,895	$ 44,239	$ 133,382	$ 87,466
Net income per share:
Basic (in dollars per share)	$ 0.35	$ 0.25	$ 0.75	$ 0.49
Diluted (in dollars per share)	$ 0.34	$ 0.24	$ 0.73	$ 0.48
Shares used in per share calculations:
Basic (in shares)	177,891	178,547	177,895	178,333
Diluted (in shares)	181,388	181,817	181,475	182,080

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income	$ 61,895	$ 44,239	$ 133,382	$ 87,466
Other comprehensive loss:
Foreign currency translation adjustments	(3,746)	(3,702)	(7,760)	(3,030)
Change in unrealized (loss) gain on investments, net of income tax benefit (expense) of $913, $62, $903 and $(113) for the three and six months ended June 30, 2013 and 2012, respectively	(1,626)	(99)	(1,555)	181
Other comprehensive loss	(5,372)	(3,801)	(9,315)	(2,849)
Comprehensive income	$ 56,523	$ 40,438	$ 124,067	$ 84,617

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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- Definition

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

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- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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+ Details

Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Tax on change in unrealized (loss) gain on investments, net	$ 913	$ 62	$ 903	$ (113)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 133,382	$ 87,466
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	86,501	95,746
Stock-based compensation	47,732	46,545
Provision for doubtful accounts	1,199	284
Loss (gain) on disposal of property and equipment, net	309	(204)
Excess tax benefits from stock-based compensation	(9,622)	(15,049)
Gain on divestiture of a business	(1,188)	0
Unrealized gain on convertible note receivable	(1,093)	0
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(35,203)	6,387
Prepaid expenses and other current assets	(19,106)	8,972
Accounts payable, accrued expenses and other current liabilities	25,311	10,141
Deferred revenue	6,612	4,141
Accrued restructuring	(223)	(2,869)
Other non-current assets and liabilities	(1,849)	495
Net cash provided by operating activities	232,762	242,055
Cash flows from investing activities:
Cash received (paid) for acquired businesses, net of cash acquired	80	(291,638)
Purchases of property and equipment	(100,847)	(72,620)
Capitalization of internal-use software costs	(35,127)	(26,263)
Purchases of short- and long-term marketable securities	(309,875)	(416,494)
Proceeds from sales of short- and long-term marketable securities	77,720	110,161
Proceeds from maturities of short- and long-term marketable securities	209,473	141,424
Proceeds from the sale of property and equipment	426	12
Net cash used in investing activities	(158,150)	(555,418)
Cash flows from financing activities:
Proceeds from the issuance of common stock under stock option plans	28,050	22,569
Excess tax benefits from stock-based compensation	9,622	15,049
Employee taxes paid related to net share settlement of stock-based awards	(21,125)	(24,196)
Repurchases of common stock	(82,782)	(75,126)
Net cash used in financing activities	(66,235)	(61,704)
Effects of exchange rate changes on cash and cash equivalents	(5,501)	(1,134)
Net increase (decrease) in cash and cash equivalents	2,876	(376,201)
Cash and cash equivalents at beginning of period	201,989	559,197
Cash and cash equivalents at end of period	204,865	182,996
Supplemental disclosure of cash flow information:
Cash paid for income taxes	35,796	35,563
Non-cash financing and investing activities:
Purchases of property and equipment included in accrued expenses	14,344	13,103
Capitalization of stock-based compensation, net of impairments	6,183	4,133
Convertible note receivable received for divestiture of a business	$ 18,882	$ 0

Nature of Business and Basis of Presentation

6 Months Ended

Jun. 30, 2013

Nature of Business and Basis of Presentation [Abstract]

Nature of Business and Basis of Presentation

Akamai Technologies, Inc. (“Akamai” or the “Company”) provides services for accelerating and improving the delivery of content and applications over the Internet. Akamai’s globally-distributed platform comprises more than 130,000 servers in 1,100 networks in 87 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 delivery of content and applications over the Internet.

The accompanying interim consolidated financial statements are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. These 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.

Certain information and footnote disclosures normally included in the Company’s annual audited consolidated financial statements and accompanying notes have been condensed or omitted in these interim financial statements. Accordingly, the unaudited consolidated financial statements included herein should be read in conjunction with the audited consolidated financial statements and accompanying notes included in Akamai’s annual report on Form 10-K for the year ended December 31, 2012, filed with the Securities and Exchange Commission on March 1, 2013.

The results of operations presented in this quarterly report on Form 10-Q are not necessarily indicative of the results of operations that may be expected for any future periods. In the opinion of management, these unaudited consolidated financial statements include all adjustments and accruals, consisting only of normal recurring adjustments, that are necessary for a fair statement of the results of all interim periods reported herein.

Revision of Prior Period Amounts

In the first quarter of 2013, the Company conducted a reevaluation of its business model. Following the review, the Company determined it was appropriate to change the classification of cost of services and support and cost of network build-out and support from sales and marketing and general and administrative expenses, respectively, to costs of revenues because such costs directly support the Company's revenues. The Company has concluded that the prior classification was an error and that it is immaterial to all annual and quarterly periods previously presented. However, to facilitate period-over-period comparisons, the Company has revised its prior period financial statements to reflect the corrections in the period in which the expenses were incurred.

The effect of the revisions to the consolidated statements of operations for the three and six months ended June 30, 2012, is as follows (in thousands):



	Three Months Ended									Six Months Ended
	As Previously Reported			Adjustment			As Revised			As Previously Reported		Adjustment			As Revised
Cost of revenues	$	107,457		$	23,803		$	131,260		$	210,023	$	46,162		$	256,185
Research and development	17,542			—			17,542			35,022		—			35,022
Sales and marketing	75,882			(19,402		)	56,480			143,172		(37,697		)	105,475
General and administrative	57,997			(4,401		)	53,596			113,703		(8,465		)	105,238
Amortization of acquired intangible assets	5,463			—			5,463			10,230		—			10,230
Restructuring (benefit) charge	(46		)	—			(46		)	14		—			14
Total costs and operating expenses	$	264,295		$	—		$	264,295		$	512,164	$	—		$	512,164

The classification error did not affect reported revenues, total costs and operating expenses, income from operations, net income or net income per share; our cash flows; or any balance sheet line item. See Item 5 of this quarterly report for the impact on the periods reported in our 2012 annual report and in our 2012 quarterly reports.

- Definition

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

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+ Details

Changes to Significant Accounting Policies	6 Months Ended
Changes to Significant Accounting Policies	Jun. 30, 2013
Accounting Changes and Error Corrections [Abstract]
Changes to Significant Accounting Policies	Changes to Significant Accounting Policies 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. 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. The Company implemented software and hardware initiatives to manage its global network more efficiently and, as a result, the expected average useful life of its network assets, primarily servers, increased from three to four years effective January 1, 2013. This change decreased depreciation on network assets in place at January 1, 2013 by approximately $9.0 million and $19.7 million on an after-tax basis, or $0.05 and $0.11 per share, for the three and six months ended June 30, 2013, respectively. Recent Accounting Pronouncements In February 2013, the Financial Accounting Standards Board ("FASB") issued guidance and disclosure requirements for reporting of comprehensive income: amounts reclassified out of accumulated other comprehensive income. The guidance requires that an entity provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, an entity is required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount reclassified is required under GAAP. The guidance became effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2012. The adoption of this guidance in the first quarter of 2013 did not have a material impact on the Company's consolidated financial results.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6507316

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6515603

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-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Business Acquisitions and Divestitures	6 Months Ended
Business Acquisitions and Divestitures	Jun. 30, 2013
Business Combinations [Abstract]
Business Acquisitions and Divestitures	Business Acquisitions and Divestitures During 2012, the Company completed four acquisitions, in each case by purchasing all of the outstanding capital stock of the acquired company. The consolidated financial statements include the operating results of each business from the date of acquisition. Pro forma results of operations for these acquisitions have not been presented because the effects of the acquisitions, individually or in the aggregate, were not material to the Company’s consolidated financial results. The total amount of acquisition-related costs for the acquisitions completed in 2012 was approximately $5.8 million for the year ended December 31, 2012. These costs were included in general and administrative costs in the consolidated statements of operations. The acquisitions completed in 2012 were accounted for using the purchase method of accounting. The total purchase consideration was allocated to the assets acquired and liabilities assumed at their estimated fair values as of the date of each acquisition, as determined by management and, with respect to identified intangible assets, by management with the assistance of an appraisal provided by a third-party valuation firm. The excess of the purchase price over the amounts allocated to assets acquired and liabilities assumed has been recorded as goodwill. Goodwill associated with these acquisitions will not be amortized and will be tested for impairment at least annually as required by the accounting guidance for goodwill and other intangible assets (see Note 10). Verivue Acquisition On December 4, 2012, the Company acquired all of the outstanding common and preferred stock of Verivue, Inc. ("Verivue") in exchange for $30.9 million in cash. In addition, the Company recorded a liability of $1.2 million for contingent consideration related to expected achievement of post-closing milestones. The Company acquired Verivue with a goal of complementing its Aura Network Solutions and accelerating time to market in providing a comprehensive, licensed content delivery network solution for network operators. The Company allocated $20.7 million of the cost of the acquisition to goodwill and $7.5 million to acquired intangible assets. The allocation of the purchase price is preliminary, pending the finalization of deferred tax assets and liabilities. The total weighted average useful life of the intangible assets acquired from Verivue is 6.4 years. The value of the goodwill from the acquisition can be attributed to a number of business factors, including a trained technical workforce in place in the United States and cost synergies. The total amount of goodwill related to the acquisition of Verivue expected to be deducted for tax purposes is $5.6 million. As of March 31, 2013, the Company determined the agreed upon post-closing milestones were not expected to be achieved and therefore reversed the $1.2 million liability recorded at December 31, 2012 for the contingent consideration and recorded it as general and administrative expense in the consolidated statement of operations. As of June 30, 2013, the Company continues to believe the milestones will not be achieved. FastSoft Acquisition On September 13, 2012, the Company acquired all of the outstanding common and preferred stock of FastSoft, Inc. ("FastSoft") in exchange for $14.4 million in cash. The Company acquired FastSoft with a goal of complementing the Company's media delivery solutions with technology for optimizing the throughput of video and other digital content across IP networks. The Company allocated $8.9 million of the cost of the acquisition to goodwill and $3.7 million to acquired intangible assets. The allocation of the purchase price is preliminary, pending the finalization of deferred tax assets and liabilities. The total weighted average useful life of the intangible assets acquired from FastSoft is 9.0 years. The value of the goodwill from the acquisition can be attributed to a number of business factors including a trained technical workforce in place in the United States and cost synergies. The total amount of goodwill related to the acquisition of FastSoft expected to be deducted for tax purposes is $2.0 million. Cotendo Acquisition On March 6, 2012, the Company acquired all of the outstanding common and preferred stock, including vested and unvested stock options, of Cotendo, Inc. ("Contendo") in exchange for $278.9 million in cash and assumption of unvested options. The Company acquired Cotendo with the intention of increasing the Company's pace of innovation in the areas of site acceleration and mobile optimization. The Company allocated $233.8 million of the cost of the acquisition to goodwill and $43.8 million to acquired intangible assets. The allocation of the purchase price has been finalized. The value of the goodwill from the acquisition of Cotendo can be attributed to a number of business factors, including potential sales opportunities to provide services to Cotendo customers; a trained technical workforce in place in the United States and Israel; an existing sales pipeline and a trained sales force; and cost synergies expected to be realized. The total weighted average amortization period for the intangible assets acquired from Cotendo is 7.1 years. The intangible assets are being amortized based upon the pattern in which the economic benefits of the intangible assets are being utilized. The total amount of goodwill related to the acquisition of Cotendo expected to be deducted for tax purposes is $45.0 million. Blaze Acquisition On February 7, 2012, the Company acquired all of the outstanding common and preferred stock, including vested and unvested stock options, of Blaze Software, Inc. ("Blaze") in exchange for $19.3 million in cash and assumption of unvested options. The Company acquired Blaze with a goal of complementing the Company's site acceleration solutions with technology designed to optimize the speed at which a web page is rendered. The Company allocated $15.1 million of the cost of the acquisition to goodwill and $5.1 million to acquired intangible assets. The allocation of the purchase price has been finalized. The total weighted average useful life of the intangible assets acquired from Blaze is 5.3 years. The value of the goodwill from this acquisition can be attributed to a number of business factors, including a trained technical workforce in place in Canada and cost synergies expected to be realized. The total amount of goodwill related to the acquisition of Blaze expected to be deducted for tax purposes is $13.5 million. ADS Divestiture Consistent with its strategy to prioritize higher-margin businesses, the Company sold its Advertising Decision Solutions ("ADS") business to MediaMath, Inc. ("MediaMath") in exchange for a $25.0 million face value convertible note receivable that is due and payable on July 24, 2014 (see Note 4). The transaction closed during the first quarter of 2013. These operations were not material to the Company's annual net sales, net income or earnings per share. No significant gains or losses were realized on this transaction. The accompanying interim consolidated financial statements for the six months ended June 30, 2013 include the impact of approximately one month of ADS operations prior to the sale. All assets and liabilities used by the business have been excluded from the consolidated balance sheet presentation. Simultaneously with the sale, the Company entered into a multi-year relationship agreement whereby MediaMath will have exclusive rights to leverage the Company's pixel-free technology for use within digital advertising and marketing applications.

- 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

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Reference 16: 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 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
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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 19: http://www.xbrl.org/2003/role/presentationRef
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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

Fair Value Measurements

6 Months Ended

Jun. 30, 2013

Marketable Securities [Abstract]

Fair Value Measurments

Fair Value Measurements

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 GAAP 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 inactive, 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 available-for-sale marketable securities held as of June 30, 2013 and December 31, 2012 (in thousands):



			Gross Unrealized							Classification on Balance Sheet
	Amortized Cost		Gains		Losses			Aggregate Fair Value		Short-term Marketable Securities		Long-term Marketable Securities
As of June 30, 2013
Certificates of deposit	$	272	$	—	$	—		$	272	$	222	$	50
Commercial paper	7,496		3		—			7,499		7,499		—
Corporate bonds	716,669		558		(1,477		)	715,750		298,816		416,934
U.S. government agency obligations	190,455		6		(435		)	190,026		19,540		170,486
	$	914,892	$	567	$	(1,912	)	$	913,547	$	326,077	$	587,470

As of December 31, 2012
Certificates of deposit	$	3,100	$	—	$	—		$	3,100	$	3,057	$	43
Commercial paper	7,481		2		(1		)	7,482		7,482		—
Corporate bonds	691,931		1,269		(205		)	692,995		217,548		475,447
U.S. government agency obligations	189,607		95		(28		)	189,674		7,505		182,169
	$	892,119	$	1,366	$	(234	)	$	893,251	$	235,592	$	657,659

Unrealized gains and unrealized temporary losses on investments classified as available-for-sale are included within accumulated other comprehensive loss. Upon realization, those amounts are reclassified from accumulated other comprehensive loss to gain on investments, net in the statements of operations. As of June 30, 2013, the Company did not hold any investment-related assets that have been in a continuous loss position for more than 12 months.

The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets, including investments and cash equivalents and liabilities, at June 30, 2013 and December 31, 2012 (in thousands):



	Total Fair Value			Fair Value Measurements at Reporting Date Using
	Total Fair Value			Level 1		Level 2		Level 3
As of June 30, 2013
Cash Equivalents and Marketable Securities:
Money market funds	$	4,550		$	4,550	$	—	$	—
Certificates of deposit	4,436			4,436		—		—
Commercial paper	7,499			—		7,499		—
Corporate bonds	715,750			—		715,750		—
U.S. government agency obligations	190,026			—		190,026		—
	$	922,261		$	8,986	$	913,275	$	—
Other Assets:
Note receivable	$	19,975		$	—	$	—	$	19,975

As of December 31, 2012
Cash Equivalents and Marketable Securities:
Money market funds	$	22,255		$	22,255	$	—	$	—
Certificates of deposit	7,473			7,473		—		—
Commercial paper	9,482			—		9,482		—
Corporate bonds	692,995			—		692,995		—
U.S. government agency obligations	189,674			—		189,674		—
	$	921,879		$	29,728	$	892,151	$	—
Other Liabilities:
Contingent consideration obligation related to Verivue acquisition	$	(1,200	)	$	—	$	—	$	(1,200	)

As of June 30, 2013 and December 31, 2012, the Company had grouped money market funds and certificates of deposit using a Level 1 valuation because market prices for such investments are readily available in active markets. As of June 30, 2013 and December 31, 2012, the Company had grouped commercial paper, U.S. government agency obligations and corporate bonds using a Level 2 valuation because quoted prices for identical or similar assets are available in markets that are inactive.

When developing fair value estimates, we maximize the use of observable inputs and minimize the use of unobservable inputs. When available, we use quoted market prices to measure fair value. The valuation technique used to measure fair value for our Level 1 and Level 2 assets is a market approach, using prices and other relevant information generated by market transactions involving identical or comparable assets. If market prices are not available, the fair value measurement is based on models that use primarily market based parameters including yield curves, volatilities, credit ratings and currency rates. In certain cases where market rate assumptions are not available, we are required to make judgments about assumptions market participants would use to estimate the fair value of a financial instrument.

The valuation technique used to measure fair value for our Level 3 asset, which consists of a $25.0 million face value convertible note receivable that is due and payable on July 24, 2014, is primarily an income approach, where the expected weighted average future cash flows are discounted back to present value. The significant unobservable inputs used in the fair value measurement of the convertible note receivable are the probability of conversion to equity and the fair value of equity in which the note is convertible into. The valuation assumed a 90% probability of being converted to equity. If a 70% probability of conversion was used, the fair value of the note would have been $21.1 million.

The valuation technique used to measure fair value of our Level 3 liability, which consists of contingent consideration related to the acquisition of Verivue, is primarily an income approach. The significant unobservable inputs used in the fair value measurement of the contingent consideration are the likelihood of achieving defined levels of specified and other customer revenue and payments to these levels.

Significant increases or decreases in the underlying assumptions used to value our Level 3 asset and liability held at June 30, 2013 and December 31, 2012, respectively, could significantly increase or decrease the fair value estimates recorded in the consolidated balance sheet.

Contractual maturities of the Company’s available-for-sale marketable securities held at June 30, 2013 and December 31, 2012 were as follows (in thousands):



	June 30, 2013		December 31, 2012
Due in 1 year or less	$	326,077	$	235,592
Due after 1 year through 5 years	587,470		657,659
	$	913,547	$	893,251

The following tables reflect the activity for the Company’s major classes of assets and liabilities measured at fair value using Level 3 inputs for the six months ended June 30, 2013 (in thousands):



	Other Assets: Note Receivable		Other Liabilities: Contingent Consideration Obligation
Balance as of January 1, 2013	$	—	$	(1,200	)
Fair value adjustment to contingent consideration for acquisition of Verivue included in general and administrative expense	—		1,200
Convertible note receivable from divestiture of a business	18,882		—
Unrealized gain on convertible note receivable included in general and administrative expense	1,093		—
Balance as of June 30, 2013	$	19,975	$	—

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901

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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.

+ Details

Accounts Receivable

6 Months Ended

Jun. 30, 2013

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

Accounts Receivable

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



	June 30, 2013			December 31, 2012
Trade accounts receivable	$	163,220		$	143,533
Unbilled accounts	78,698			79,051
Gross accounts receivable	241,918			222,584
Allowance for doubtful accounts	(1,137		)	(1,154		)
Reserve for cash-basis customers	(3,495		)	(2,653		)
Total accounts receivable reserves	(4,632		)	(3,807		)
Accounts receivable, net	$	237,286		$	218,777

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.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References

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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5066-111524

Reference 2: 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 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
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Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3, 4
-Article 5

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 7
-Article 9

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

+ Details

Accrued Expenses and Other Current Liabilities

6 Months Ended

Jun. 30, 2013

Accounts Payable and Accrued Liabilities, Current [Abstract]

Accrued Expenses and Other Current Liabilities

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



	June 30, 2013		December 31, 2012
Payroll and other related benefits	$	52,293	$	75,039
Bandwidth and co-location	20,838		27,260
Income, property and other taxes	61,458		22,093
Professional service fees	4,309		3,643
Other	4,754		5,052
Total	$	143,652	$	133,087

Net Income per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share Reconciliation [Abstract]

Net Income per Share

Basic net income per share is computed using the weighted average number of common shares outstanding during the applicable period. Diluted net income per 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 and restricted stock units (“RSUs”) issued by the Company.

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Numerator:
Net income	$	61,895	$	44,239	$	133,382	$	87,466
Denominator:
Shares used for basic net income per share	177,891		178,547		177,895		178,333
Effect of dilutive securities:
Stock options	1,724		2,092		1,750		2,259
RSUs and deferred stock units	1,773		1,178		1,830		1,488
Shares used for diluted net income per share:	181,388		181,817		181,475		182,080
Basic net income per share	$	0.35	$	0.25	$	0.75	$	0.49
Diluted net income per share	$	0.34	$	0.24	$	0.73	$	0.48

For the three and six months ended June 30, 2013 and 2012, certain potential outstanding stock options and service-based RSUs were excluded from the computation of diluted earnings per share because the effect of including these options and RSUs would be anti-dilutive. Additionally, certain performance-based RSUs were excluded from the computation of diluted net income per share because the underlying performance conditions for such RSUs had not been met as of these dates. The number of potentially outstanding shares excluded from the computation of diluted earnings per share are as follows (in thousands):



	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Options	1,888	3,084	2,018	2,883
Service-based RSUs	159	1,858	327	1,441
Performance-based RSUs	1,148	2,424	1,148	2,276
Total shares excluded from computation	3,195	7,366	3,493	6,600

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.

Stockholders' Equity

6 Months Ended

Jun. 30, 2013

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

Stock Repurchase Program

In April 2012, the Company's Board of Directors authorized a $150.0 million stock repurchase program covering a twelve-month period commencing on May 1, 2012. In January 2013, the Board of Directors authorized a $150.0 million extension of its share repurchase program, effective for a twelve-month period beginning February 1, 2013. The timing and amount of any future share repurchases 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. The Company may choose to suspend or discontinue the repurchase program at any time. Any purchases made under the program will be reflected as an increase in cash used for financing activities. Unused amounts from the May 2012 program were not carried over to the program approved in January 2013.

During the three and six months ended June 30, 2013, the Company repurchased 1.1 million and 2.2 million shares, respectively, of its common stock for $42.5 million and $82.8 million, respectively. During the three and six months ended June 30, 2012, the Company repurchased 2.2 million and 2.4 million shares, respectively, of its common stock for $67.2 million and $75.1 million, respectively. As of June 30, 2013, the Company had $76.8 million remaining available for future purchases of shares under the current repurchase program.

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 three and six months ended June 30, 2013 and 2012 (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Stock-based compensation by type of award:
Stock options	$	3,104		$	4,366		$	6,293		$	7,466
Deferred stock units	1,705			1,885			1,705			1,885
RSUs	21,608			19,734			42,526			38,462
Shares issued under the Employee Stock Purchase Plan	1,629			1,471			3,391			2,865
Amounts capitalized as internal-use software	(3,245		)	(1,835		)	(6,183		)	(4,133		)
Total stock-based compensation before income taxes	24,801			25,621			47,732			46,545
Less: Income tax benefit	(9,345		)	(9,375		)	(16,309		)	(17,872		)
Total stock-based compensation, net of taxes	$	15,456		$	16,246		$	31,423		$	28,673
Effect of stock-based compensation on income by line item:
Cost of revenues	$	2,718		$	3,063		$	5,345		$	5,769
Research and development expense	3,867			4,901			8,236			8,831
Sales and marketing expense	9,799			8,814			19,230			16,925
General and administrative expense	8,417			8,843			14,921			15,020
Provision for income taxes	(9,345		)	(9,375		)	(16,309		)	(17,872		)
Total cost related to stock-based compensation, net of taxes	$	15,456		$	16,246		$	31,423		$	28,673

In addition to the amounts of stock-based compensation reported in the table above, the Company’s consolidated statements of operations for the three and six months ended June 30, 2013 include stock-based compensation reflected as a component of amortization of capitalized internal-use software of $2.0 million and $3.9 million, respectively, before taxes. The Company’s consolidated statements of operations for the three and six months ended June 30, 2012 include stock-based compensation reflected as a component of amortization of capitalized internal-use software of $1.9 million and $3.7 million, respectively, before taxes.

- 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 FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 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 15: 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 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 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 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: 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 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 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 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2013

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

Comprehensive Income

Accumulated Other Comprehensive Loss

The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders' equity, for the six months ended June 30, 2013 (in thousands):



	Foreign Currency Translation Adjustments			Net Unrealized Gain (Loss) on Investments			Total
Balance as of January 1, 2013	$	(2,354	)	$	714		$	(1,640	)
Other comprehensive loss, net of tax	(7,760		)	(1,555		)	(9,315		)
Balance as of June 30, 2013	$	(10,114	)	$	(841	)	$	(10,955	)

The tax effect on accumulated unrealized gain (loss) on investments was $(0.5) million and $0.4 million as of June 30, 2013 and December 31, 2012, respectively. Amounts reclassified from accumulated other comprehensive loss to net income were insignificant for the six months ended June 30, 2013.

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 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.

+ References

Reference 1: 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=20435746&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: 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 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 10: 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.

+ Details

Goodwill and Other Intangible Assets

6 Months Ended

Jun. 30, 2013

Goodwill and Other Intangible Assets [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Acquired Intangible Assets

The Company has recorded goodwill and acquired intangible assets as a result of business acquisitions that occurred between 2000 and 2012. The Company also acquired license rights from the Massachusetts Institute of Technology in 1999. In February 2012, the Company recorded goodwill of $15.1 million and acquired intangible assets of $5.1 million as a result of the acquisition of Blaze. In March 2012, the Company recorded goodwill of $233.8 million and acquired intangible assets of $43.8 million as a result of the acquisition of Cotendo. In September 2012, the Company recorded goodwill of $8.9 million and acquired intangible assets of $3.7 million as a result of the acquisition of FastSoft. In December 2012, the Company recorded goodwill of $20.7 million and acquired intangible assets of $7.5 million as a result of the acquisition of Verivue (see Note 3).

In accordance with current accounting standards, goodwill is not amortized as it does not qualify as an amortizing intangible asset. The Company tests goodwill for impairment at least annually as required by the accounting guidance for goodwill and acquired intangible assets. Through the date the consolidated financial statements were issued, no triggering events had occurred that would indicate a potential impairment exists.

The changes in the carrying amount of goodwill were as follows (in thousands):



Balance as of January 1, 2013	$	731,325
Divestiture of Advertising Decision Solutions business	(1,939		)
Balance as of June 30, 2013	$	729,386

Acquired intangible assets that are subject to amortization consist of the following (in thousands, except for years):



	June 30, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization Period in Years
Completed technology	$	62,331	$	(30,666	)	$	31,665	6
Customer relationships	100,400		(71,533		)	28,867		9
Non-compete agreements	9,170		(3,716		)	5,454		4
Trademarks and trade names	3,400		(824		)	2,576		9
Acquired license rights	490		(490		)	—		10
Total	$	175,791	$	(107,229	)	$	68,562



	December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization Period in Years
Completed technology	$	71,531	$	(32,842	)	$	38,689	6
Customer relationships	104,700		(68,702		)	35,998		9
Non-compete agreements	14,770		(7,645		)	7,125		5
Trademarks and trade names	3,700		(958		)	2,742		9
Acquired license rights	490		(490		)	—		10
Total	$	195,191	$	(110,637	)	$	84,554

Aggregate expense related to amortization of acquired intangible assets for the three and six months ended June 30, 2013 was $5.7 million and $11.8 million, respectively. Aggregate expense related to amortization of acquired intangible assets for the three and six months ended June 30, 2012 was $5.5 million and $10.2 million, respectively. Based on the Company’s acquired intangible assets as of June 30, 2013, aggregate expense related to amortization of acquired intangible assets is expected to be $9.6 million for the remainder of 2013, and $18.8 million, $16.2 million, $11.4 million and $7.6 million for 2014, 2015, 2016 and 2017, 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

Concentration of Credit Risk	6 Months Ended
Concentration of Credit Risk	Jun. 30, 2013
Concentration of Credit Risk [Abstract]
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that subject the Company to credit risk consist of cash and cash equivalents, marketable securities, accounts receivable and the convertible note receivable issued to it by MediaMath. The Company maintains the majority of its cash, cash equivalents and marketable securities balances with major financial institutions that the Company believes are of high credit standing. 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. As of June 30, 2013 and December 31, 2012, one customer accounted for greater than 10% of the Company's accounts receivable. The Company believes that, at June 30, 2013, concentration of credit risk related to accounts receivable was not significant.

- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 16
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 94-6
-Paragraph 21, 22, 24
-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 107
-Paragraph 15A
-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

Segment and Geographic Information

6 Months Ended

Jun. 30, 2013

Segment and Geographic Information [Abstract]

Segment and Geographic Information

The Company's chief decision-maker, as defined under the authoritative guidance that discusses disclosures about segments of an enterprise and related information, is its Chief Executive Officer and executive management team. As of June 30, 2013, the Company operated in one industry segment: providing services for accelerating and improving the delivery of content and applications over the Internet. The Company is managed and operated as one business and does not have separate reportable segments as defined in the guidance. A single management team that reports to the Chief Executive Officer comprehensively manages the entire business.

The Company deploys its servers into networks worldwide. As of June 30, 2013, the Company had $264.3 million and $141.4 million of property and equipment, net of accumulated depreciation, located in the United States and in foreign locations, respectively. As of December 31, 2012, the Company had $225.5 million and $119.6 million of property and equipment, net of accumulated depreciation, located in the United States and in foreign locations, respectively.

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Revenues derived from outside of the United States	29	%	27	%	29	%	28	%
Revenues derived from Europe	17	%	17	%	17	%	17	%

No single country outside the United States accounted for 10% or more of revenues during these periods. For the three and six months ended June 30, 2013 and 2012, no customer accounted for 10% or more of total revenues.

- 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
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-Name Accounting Standards Codification
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-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.

+ Details

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective income tax rate, including discrete items, was 34.0% and 38.6% for the six months ended June 30, 2013 and 2012, respectively. The effective income tax rate is based upon estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods, including retroactive changes in tax legislation, settlements of tax audits or assessments, the resolution or identification of tax position uncertainties, and acquisitions of other companies. The discrete items include the tax effect of the reinstatement of the federal research and development credit at the beginning of 2013, which was retroactive to 2012, certain stock options and interest and penalties related to uncertain tax positions. For the six months ended June 30, 2013, the effective income tax rate was lower than the federal statutory tax rate mainly due to the composition of income in foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the United States, as well as the reinstatement of the federal research and development credit at the beginning of 2013, which was retroactive to 2012. For the six months ended June 30, 2012, the effective income tax rate was higher than the federal statutory tax rate mainly due to the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income tax expense. During 2012, the Company corrected errors in its reported income tax expense attributable to prior fiscal periods. During the six months ended June 30, 2013, the Company concluded the review which gave rise to the corrections and recorded an additional $1.4 million of income tax expense.

- 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

+ Details

Forward Currency Contracts	6 Months Ended
Forward Currency Contracts	Jun. 30, 2013
Foreign Currency [Abstract]
Forward Currency Contracts	Forward Currency Contracts The assets and liabilities of the Company's international 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 loss, a separate component of stockholders’ equity. Gains and losses on inter-company and other non-functional currency transactions are recorded in other income, net in the consolidated statements of operations. For the three and six months ended June 30, 2013, the Company recorded an immaterial amount of net foreign currency losses. For the three and six months ended June 30, 2012, the Company recorded net foreign currency gains of $1.0 million and $0.5 million, respectively, in the consolidated statement of operations. The Company has entered 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, net in the consolidated statements of operations. As of June 30, 2013 and December 31, 2012, the fair value of the forward currency contracts and the underlying net loss for the three and six months ended June 30, 2013 and 2012 were immaterial. The Company's foreign currency forward contracts include credit risk to the extent that the counterparties may be unable to meet the terms of the agreements. The Company seeks to minimize counterparty credit (or repayment) risk by entering into transactions only with major financial institutions of investment grade credit rating.

- Definition

The entire disclosure for foreign currency transactions and translation. This may include description of foreign currency transactions, foreign currency gains and losses, explanation of change in cumulative translation adjustment, description of effect of subsequent foreign currency exchange rate change, cumulative translation adjustment movement, foreign currency translation adjustment by component movement, translation adjustment for net investment hedge movement, adjustment for long-term intercompany transactions, schedule of long-term intercompany balances and any other foreign currency transactions and translation related items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
-Paragraph 1
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-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 30, 31, 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.

+ Details

Commitments, Contingencies and Guarantees

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

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 May 2022 and generally require the payment of real estate taxes, insurance, maintenance and operating costs. The expected minimum aggregate future obligations under non-cancelable leases as of June 30, 2013 were as follows (in thousands):



Remaining 2013	$	13,355
2014	25,846
2015	23,845
2016	19,961
2017	19,113
Thereafter	34,169
Total	$	136,289

Purchase Commitments

The Company has long-term commitments for bandwidth usage and co-location services with various network and Internet service providers. The following table reflects the Company's minimum commitments pursuant to these contracts in effect as of June 30, 2013, as well as aggregate purchase order commitments with various vendors (in thousands):



	Payments Due by Period
	Total		Remainder of 2013		2014		2015		2016		2017
Bandwidth and co-location agreements	$	73,034	$	53,032	$	16,244	$	3,000	$	559	$	199
Open vendor purchase orders	79,544		71,832		5,768		1,944		—		—
Total	$	152,578	$	124,864	$	22,012	$	4,944	$	559	$	199

Litigation

The Company is party to various 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 impact on the Company’s business, results of operations, financial condition or cash flows.

Guarantees

The Company has identified guarantees in accordance with the authoritative guidance for guarantor’s accounting and disclosure requirements for guarantees, including indirect guarantees of indebtedness of others, which is an interpretation of previous accounting statements and a rescission of previous guidance. This guidance elaborates on the existing disclosure requirements for most guarantees, including loan guarantees such as standby letters of credit. The guidance also clarifies that at the time an entity issues a guarantee, that entity must recognize an initial liability for the fair value, or market value, of the obligation it assumes under the guarantee and must disclose that information in its interim and annual financial statements. The Company evaluates losses for guarantees under the statement for accounting for contingencies, as interpreted by the guidance for guarantor’s accounting and disclosure requirements for guarantees, including direct guarantees of indebtedness of others. The Company considers such factors as the degree of probability that the Company would be required to satisfy the liability associated with the guarantee and the ability to make a reasonable estimate of the amount of loss. To date, the Company has not incurred material costs as a result of such obligations and has not accrued any liabilities related to such obligations in its financial statements. The fair value of the Company’s outstanding guarantees as of June 30, 2013 was determined to be immaterial.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
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-Paragraph 1
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-Name FASB Interpretation (FIN)
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 5
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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

Restructuring

6 Months Ended

Jun. 30, 2013

Restructuring and Related Activities [Abstract]

Restructuring

In prior years, the Company implemented workforce reductions of employees from all areas of the Company. The Company recorded restructuring charges for the amount of one-time benefits provided to affected employees. Included in these costs was a net increase in non-cash, stock-based compensation reflecting a modification of certain stock-based awards previously granted to the affected employees. Additionally, in connection with excess and vacated facilities under long-term non-cancelable leases, the Company recorded a restructuring charge for the estimated future lease payments, less estimated sublease income, for these vacated facilities. For the six months ended June 30, 2013, the Company recorded additional restructuring charges related to workforce reductions and relocation expenses.

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



	Leases			Severance			Total
Beginning balance, January 1, 2013	$	517		$	124		$	641
Restructuring charge	—			822			822
Cash payments	(61		)	(560		)	(621		)
Ending balance, June 30, 2013	$	456		$	386		$	842
Current portion of accrued restructuring	$	147		$	386		$	533
Long-term portion of accrued restructuring	$	309		$	—		$	309

- 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

Nature of Business and Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2013

Accounting Changes and Error Corrections [Abstract]

Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]

The effect of the revisions to the consolidated statements of operations for the three and six months ended June 30, 2012, is as follows (in thousands):



	Three Months Ended									Six Months Ended
	As Previously Reported			Adjustment			As Revised			As Previously Reported		Adjustment			As Revised
Cost of revenues	$	107,457		$	23,803		$	131,260		$	210,023	$	46,162		$	256,185
Research and development	17,542			—			17,542			35,022		—			35,022
Sales and marketing	75,882			(19,402		)	56,480			143,172		(37,697		)	105,475
General and administrative	57,997			(4,401		)	53,596			113,703		(8,465		)	105,238
Amortization of acquired intangible assets	5,463			—			5,463			10,230		—			10,230
Restructuring (benefit) charge	(46		)	—			(46		)	14		—			14
Total costs and operating expenses	$	264,295		$	—		$	264,295		$	512,164	$	—		$	512,164

- Definition

Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made.

+ References + Details

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Marketable Securities [Abstract]

Marketable Securities

The following is a summary of available-for-sale marketable securities held as of June 30, 2013 and December 31, 2012 (in thousands):



			Gross Unrealized							Classification on Balance Sheet
	Amortized Cost		Gains		Losses			Aggregate Fair Value		Short-term Marketable Securities		Long-term Marketable Securities
As of June 30, 2013
Certificates of deposit	$	272	$	—	$	—		$	272	$	222	$	50
Commercial paper	7,496		3		—			7,499		7,499		—
Corporate bonds	716,669		558		(1,477		)	715,750		298,816		416,934
U.S. government agency obligations	190,455		6		(435		)	190,026		19,540		170,486
	$	914,892	$	567	$	(1,912	)	$	913,547	$	326,077	$	587,470

As of December 31, 2012
Certificates of deposit	$	3,100	$	—	$	—		$	3,100	$	3,057	$	43
Commercial paper	7,481		2		(1		)	7,482		7,482		—
Corporate bonds	691,931		1,269		(205		)	692,995		217,548		475,447
U.S. government agency obligations	189,607		95		(28		)	189,674		7,505		182,169
	$	892,119	$	1,366	$	(234	)	$	893,251	$	235,592	$	657,659

Schedule of Fair Value Measurement



	Total Fair Value			Fair Value Measurements at Reporting Date Using
	Total Fair Value			Level 1		Level 2		Level 3
As of June 30, 2013
Cash Equivalents and Marketable Securities:
Money market funds	$	4,550		$	4,550	$	—	$	—
Certificates of deposit	4,436			4,436		—		—
Commercial paper	7,499			—		7,499		—
Corporate bonds	715,750			—		715,750		—
U.S. government agency obligations	190,026			—		190,026		—
	$	922,261		$	8,986	$	913,275	$	—
Other Assets:
Note receivable	$	19,975		$	—	$	—	$	19,975

As of December 31, 2012
Cash Equivalents and Marketable Securities:
Money market funds	$	22,255		$	22,255	$	—	$	—
Certificates of deposit	7,473			7,473		—		—
Commercial paper	9,482			—		9,482		—
Corporate bonds	692,995			—		692,995		—
U.S. government agency obligations	189,674			—		189,674		—
	$	921,879		$	29,728	$	892,151	$	—
Other Liabilities:
Contingent consideration obligation related to Verivue acquisition	$	(1,200	)	$	—	$	—	$	(1,200	)

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

Contractual maturities of the Company’s available-for-sale marketable securities held at June 30, 2013 and December 31, 2012 were as follows (in thousands):



	June 30, 2013		December 31, 2012
Due in 1 year or less	$	326,077	$	235,592
Due after 1 year through 5 years	587,470		657,659
	$	913,547	$	893,251

FairValueAssetsAndLiabiltiesUnobservableInputReconciliation



	Other Assets: Note Receivable		Other Liabilities: Contingent Consideration Obligation
Balance as of January 1, 2013	$	—	$	(1,200	)
Fair value adjustment to contingent consideration for acquisition of Verivue included in general and administrative expense	—		1,200
Convertible note receivable from divestiture of a business	18,882		—
Unrealized gain on convertible note receivable included in general and administrative expense	1,093		—
Balance as of June 30, 2013	$	19,975	$	—

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: 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 2: 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 3: 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 4: 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

Reference 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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.

+ Details

- Definition

The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

+ References

Reference 1: 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=7578670&loc=d3e19279-110258

Reference 2: 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=7578670&loc=d3e19207-110258

Reference 3: 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=7578670&loc=d3e19190-110258

Reference 4: 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 5: 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 6: 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 7: 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.

+ Details

Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2013

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

Schedule of Accounts Receivable

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



	June 30, 2013			December 31, 2012
Trade accounts receivable	$	163,220		$	143,533
Unbilled accounts	78,698			79,051
Gross accounts receivable	241,918			222,584
Allowance for doubtful accounts	(1,137		)	(1,154		)
Reserve for cash-basis customers	(3,495		)	(2,653		)
Total accounts receivable reserves	(4,632		)	(3,807		)
Accounts receivable, net	$	237,286		$	218,777

Accrued Expenses and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2013

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):



	June 30, 2013		December 31, 2012
Payroll and other related benefits	$	52,293	$	75,039
Bandwidth and co-location	20,838		27,260
Income, property and other taxes	61,458		22,093
Professional service fees	4,309		3,643
Other	4,754		5,052
Total	$	143,652	$	133,087

Net Income per Share (Tables)

6 Months Ended

Jun. 30, 2013

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 share (in thousands, except per share data):



	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Numerator:
Net income	$	61,895	$	44,239	$	133,382	$	87,466
Denominator:
Shares used for basic net income per share	177,891		178,547		177,895		178,333
Effect of dilutive securities:
Stock options	1,724		2,092		1,750		2,259
RSUs and deferred stock units	1,773		1,178		1,830		1,488
Shares used for diluted net income per share:	181,388		181,817		181,475		182,080
Basic net income per share	$	0.35	$	0.25	$	0.75	$	0.49
Diluted net income per share	$	0.34	$	0.24	$	0.73	$	0.48

Schedule of Shares Excluded from Computation of Diluted Earnings Per Share

The number of potentially outstanding shares excluded from the computation of diluted earnings per share are as follows (in thousands):



	Three Months Ended June 30,		Six Months Ended June 30,
	2013	2012	2013	2012
Options	1,888	3,084	2,018	2,883
Service-based RSUs	159	1,858	327	1,441
Performance-based RSUs	1,148	2,424	1,148	2,276
Total shares excluded from computation	3,195	7,366	3,493	6,600

Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Stockholders' Equity Note [Abstract]

Schedule of Stock-Based Compensation Expense



	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Stock-based compensation by type of award:
Stock options	$	3,104		$	4,366		$	6,293		$	7,466
Deferred stock units	1,705			1,885			1,705			1,885
RSUs	21,608			19,734			42,526			38,462
Shares issued under the Employee Stock Purchase Plan	1,629			1,471			3,391			2,865
Amounts capitalized as internal-use software	(3,245		)	(1,835		)	(6,183		)	(4,133		)
Total stock-based compensation before income taxes	24,801			25,621			47,732			46,545
Less: Income tax benefit	(9,345		)	(9,375		)	(16,309		)	(17,872		)
Total stock-based compensation, net of taxes	$	15,456		$	16,246		$	31,423		$	28,673
Effect of stock-based compensation on income by line item:
Cost of revenues	$	2,718		$	3,063		$	5,345		$	5,769
Research and development expense	3,867			4,901			8,236			8,831
Sales and marketing expense	9,799			8,814			19,230			16,925
General and administrative expense	8,417			8,843			14,921			15,020
Provision for income taxes	(9,345		)	(9,375		)	(16,309		)	(17,872		)
Total cost related to stock-based compensation, net of taxes	$	15,456		$	16,246		$	31,423		$	28,673

- 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

Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2013

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

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders' equity, for the six months ended June 30, 2013 (in thousands):



	Foreign Currency Translation Adjustments			Net Unrealized Gain (Loss) on Investments			Total
Balance as of January 1, 2013	$	(2,354	)	$	714		$	(1,640	)
Other comprehensive loss, net of tax	(7,760		)	(1,555		)	(9,315		)
Balance as of June 30, 2013	$	(10,114	)	$	(841	)	$	(10,955	)

Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2013

Goodwill and Other Intangible Assets [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill were as follows (in thousands):



Balance as of January 1, 2013	$	731,325
Divestiture of Advertising Decision Solutions business	(1,939		)
Balance as of June 30, 2013	$	729,386

Schedule of Other Intangible Assets

Acquired intangible assets that are subject to amortization consist of the following (in thousands, except for years):



	June 30, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization Period in Years
Completed technology	$	62,331	$	(30,666	)	$	31,665	6
Customer relationships	100,400		(71,533		)	28,867		9
Non-compete agreements	9,170		(3,716		)	5,454		4
Trademarks and trade names	3,400		(824		)	2,576		9
Acquired license rights	490		(490		)	—		10
Total	$	175,791	$	(107,229	)	$	68,562



	December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Weighted Average Amortization Period in Years
Completed technology	$	71,531	$	(32,842	)	$	38,689	6
Customer relationships	104,700		(68,702		)	35,998		9
Non-compete agreements	14,770		(7,645		)	7,125		5
Trademarks and trade names	3,700		(958		)	2,742		9
Acquired license rights	490		(490		)	—		10
Total	$	195,191	$	(110,637	)	$	84,554

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Revenues derived from outside of the United States	29	%	27	%	29	%	28	%
Revenues derived from Europe	17	%	17	%	17	%	17	%

Commitments, Contingencies and Guarantees (Tables)

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Minimum Aggregate Future Obligations Under Non-cancelable Leases

The expected minimum aggregate future obligations under non-cancelable leases as of June 30, 2013 were as follows (in thousands):



Remaining 2013	$	13,355
2014	25,846
2015	23,845
2016	19,961
2017	19,113
Thereafter	34,169
Total	$	136,289

Recorded Unconditional Purchase Obligations [Table Text Block]

The following table reflects the Company's minimum commitments pursuant to these contracts in effect as of June 30, 2013, as well as aggregate purchase order commitments with various vendors (in thousands):



	Payments Due by Period
	Total		Remainder of 2013		2014		2015		2016		2017
Bandwidth and co-location agreements	$	73,034	$	53,032	$	16,244	$	3,000	$	559	$	199
Open vendor purchase orders	79,544		71,832		5,768		1,944		—		—
Total	$	152,578	$	124,864	$	22,012	$	4,944	$	559	$	199

- 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

Restructuring (Tables)

6 Months Ended

Jun. 30, 2013

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost [Table Text Block]

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



	Leases			Severance			Total
Beginning balance, January 1, 2013	$	517		$	124		$	641
Restructuring charge	—			822			822
Cash payments	(61		)	(560		)	(621		)
Ending balance, June 30, 2013	$	456		$	386		$	842
Current portion of accrued restructuring	$	147		$	386		$	533
Long-term portion of accrued restructuring	$	309		$	—		$	309

Nature of Business and Basis of Presentation Narrative (Details)	Jun. 30, 2013 countries network server
Nature of Business and Basis of Presentation [Abstract]
Number of servers \| server	130,000
Number of networks \| network	1,100
Number of countries servers are in \| countries	87

Nature of Business and Basis of Presentation Revision of Prior Period Amounts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues	$ 124,705	$ 131,260	$ 245,097	$ 256,185
Research and development	20,597	17,542	42,502	35,022
Sales and marketing	67,825	56,480	130,515	105,475
General and administrative	61,351	53,596	116,731	105,238
Amortization of acquired intangible assets	5,734	5,463	11,794	10,230
Restructuring charge (benefit)	391	(46)	822	14
Total costs and operating expenses	$ 280,603	264,295	$ 547,461	512,164
As previously reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues		107,457		210,023
Research and development		17,542		35,022
Sales and marketing		75,882		143,172
General and administrative		57,997		113,703
Amortization of acquired intangible assets		5,463		10,230
Restructuring charge (benefit)		(46)		14
Total costs and operating expenses		264,295		512,164
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of revenues		23,803		46,162
Research and development		0		0
Sales and marketing		(19,402)		(37,697)
General and administrative		(4,401)		(8,465)
Amortization of acquired intangible assets		0		0
Restructuring charge (benefit)		0		0
Total costs and operating expenses		$ 0		$ 0

Changes to Significant Accounting Policies Narrative (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)
Change in Accounting Estimate [Line Items]
Property and equipment per unit value minimum	$ 1,000	$ 1,000
Property and equipment useful life minimum (in years)		1 year
Net Income [Member]
Change in Accounting Estimate [Line Items]
Change in accounting estimate, financial impact	9,000,000	$ 19,700,000
Earnings Per Share, Basic [Member]
Change in Accounting Estimate [Line Items]
Change in accounting estimate, financial impact	$ 0.05	$ 0.11
Software and Hardware [Member]
Change in Accounting Estimate [Line Items]
Property and equipment useful life (in years)		4 years
Software and Hardware [Member] \| Historical Useful Life [Member]
Change in Accounting Estimate [Line Items]
Property and equipment useful life (in years)		3 years

Business Acquisitions and Divestitures Narrative (Details)					12 Months Ended
	Dec. 04, 2012 USD ($)	Sep. 13, 2012 USD ($)	Mar. 06, 2012 USD ($)	Feb. 07, 2012 USD ($)	Dec. 31, 2012 USD ($) acquisition	Jun. 30, 2013 USD ($)
Business Acquisition [Line Items]
Number of businesses acquired (in number of businesses) \| acquisition					4
Acquisition related costs					$ 5,800,000
Note receivable						$ 25,000,000
Verivue [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 30,900,000
Contingent consideration, at fair value	1,200,000
Business acquisition purchase price allocation for goodwill	20,700,000
Business acquisition purchase price allocation for intangible assets	$ 7,500,000
Weighted average amortization period (in years)	6 years 4 months 24 days
Goodwill, expected tax deductible amount	$ 5,600,000
FastSoft [Member]
Business Acquisition [Line Items]
Total purchase consideration		$ 14,400,000
Business acquisition purchase price allocation for goodwill		8,900,000
Business acquisition purchase price allocation for intangible assets		$ 3,700,000
Weighted average amortization period (in years)		9 years
Goodwill, expected tax deductible amount		$ 2,000,000
Cotendo Acquisition [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 278,900,000
Business acquisition purchase price allocation for goodwill			233,800,000
Business acquisition purchase price allocation for intangible assets			$ 43,800,000
Weighted average amortization period (in years)			7 years 1 month 6 days
Goodwill, expected tax deductible amount			$ 45,000,000
Blaze Acquisition [Member]
Business Acquisition [Line Items]
Total purchase consideration				$ 19,300,000
Business acquisition purchase price allocation for goodwill				15,100,000
Business acquisition purchase price allocation for intangible assets				$ 5,100,000
Weighted average amortization period (in years)				5 years 3 months 18 days
Goodwill, expected tax deductible amount				$ 13,500,000

Fair Value Measurements Narrative (Details)	Jun. 30, 2013 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Note receivable	$ 25,000,000
Available-for-sale securities, continuous unrealized loss position, twelve months or longer	$ 0
Probability of note receivable conversion	90.00%
Alternative probability of conversion [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Note receivable	$ 21,100,000
Probability of note receivable conversion	70.00%

Fair Value Measurements Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	$ 914,892	$ 892,119
Gross unrealized gains	567	1,366
Gross unrealized losses	(1,912)	(234)
Aggregate fair value	913,547	893,251
Short-term marketable securities	326,077	235,592
Long-term marketable securities	587,470	657,659
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	272	3,100
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Aggregate fair value	272	3,100
Short-term marketable securities	222	3,057
Long-term marketable securities	50	43
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	7,496	7,481
Gross unrealized gains	3	2
Gross unrealized losses	0	(1)
Aggregate fair value	7,499	7,482
Short-term marketable securities	7,499	7,482
Long-term marketable securities	0	0
U.S. Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	716,669	691,931
Gross unrealized gains	558	1,269
Gross unrealized losses	(1,477)	(205)
Aggregate fair value	715,750	692,995
Short-term marketable securities	298,816	217,548
Long-term marketable securities	416,934	475,447
U.S. Government Agencies Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, amortized cost	190,455	189,607
Gross unrealized gains	6	95
Gross unrealized losses	(435)	(28)
Aggregate fair value	190,026	189,674
Short-term marketable securities	19,540	7,505
Long-term marketable securities	$ 170,486	$ 182,169

Fair Value Measurements Schedule of Fair Value Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	$ 913,547	$ 893,251
Total Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and marketable securities	922,261	921,879
Note receivable	19,975
Contingent consideration		(1,200)
Total Fair Value [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	4,550	22,255
Total Fair Value [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	4,436	7,473
Total Fair Value [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	7,499	9,482
Total Fair Value [Member] \| U.S. Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	715,750	692,995
Total Fair Value [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	190,026	189,674
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and marketable securities	8,986	29,728
Note receivable	0
Contingent consideration		0
Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	4,550	22,255
Level 1 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	4,436	7,473
Level 1 [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 1 [Member] \| U.S. Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 1 [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and marketable securities	913,275	892,151
Note receivable	0
Contingent consideration		0
Level 2 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Level 2 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 2 [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	7,499	9,482
Level 2 [Member] \| U.S. Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	715,750	692,995
Level 2 [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	190,026	189,674
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and marketable securities	0	0
Note receivable	19,975
Contingent consideration		(1,200)
Level 3 [Member] \| Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Level 3 [Member] \| Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 3 [Member] \| Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 3 [Member] \| U.S. Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	0	0
Level 3 [Member] \| U.S. Government Agencies Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate fair value	$ 0	$ 0

Fair Value Measurements Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Due in 1 year or less	$ 326,077	$ 235,592
Due after 1 year through 5 years	587,470	657,659
Aggregate fair value	$ 913,547	$ 893,251

- 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

Fair Value Measurements Schedule of Activity of Major Classes of Assets Measured at Fair Value Using Level 3 Inputs (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2013 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 1, 2013, other assets	$ 0
Balance as of January 1, 2013, other liabilities	(1,200)
Fair value adjustment to contingent consideration for acquisition of Verivue included in general and administrative expense	1,200
Convertible note receivable from divestiture of a business	18,882
Unrealized gain on convertible note receivable included in general and administrative expense	1,093
Balance as of June 30, 2013, other assets	19,975
Balance as of June 30, 2013, other liabilities	$ 0

Accounts Receivable Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 241,918	$ 222,584
Allowance for doubtful accounts	(1,137)	(1,154)
Reserve for cash-basis customers	(3,495)	(2,653)
Accounts receivable reserve	(4,632)	(3,807)
Accounts receivable, net	237,286	218,777
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	163,220	143,533
Unbilled Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 78,698	$ 79,051

Accrued Expenses and Other Current Liabilities Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Accounts Payable and Accrued Liabilities, Current [Abstract]
Payroll and other related benefits	$ 52,293	$ 75,039
Bandwidth and co-location	20,838	27,260
Income, property and other taxes	61,458	22,093
Professional service fees	4,309	3,643
Other	4,754	5,052
Total	$ 143,652	$ 133,087

- 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

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

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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator [Abstract]
Net income (in dollars)	$ 61,895	$ 44,239	$ 133,382	$ 87,466
Denominator [Abstract]
Denominator for basic net income per common share	177,891	178,547	177,895	178,333
Effect of dilutive securities:
Denominator for diluted net income per common share	181,388	181,817	181,475	182,080
Basic net income per common share (in dollars per share)	$ 0.35	$ 0.25	$ 0.75	$ 0.49
Diluted net income per common share (in dollars per share)	$ 0.34	$ 0.24	$ 0.73	$ 0.48
Stock Option [Member]
Effect of dilutive securities:
Dilutive securities	1,724	2,092	1,750	2,259
Restricted Stock Units and Deferred Stock Units [Member]
Effect of dilutive securities:
Dilutive securities	1,773	1,178	1,830	1,488

Net Income per Share Schedule of Shares Excluded from Computation of Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	3,195	7,366	3,493	6,600
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,888	3,084	2,018	2,883
Restricted Stock Units Service Based [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	159	1,858	327	1,441
Restricted Stock Units Performance Based [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,148	2,424	1,148	2,276

- 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 Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: 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 3: 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 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 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 6: 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 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.

Reference 8: 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.

+ Details

Stockholders' Equity Narrative (Details) - USD ($) shares in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2013	Apr. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount	$ 150,000,000.0	$ 150,000,000
Shares repurchased during period (in shares)			1.1	2.2	2.2	2.4
Value of shares repurchased during period			$ 42,500,000	$ 67,200,000	$ 82,800,000	$ 75,100,000
Remaining amount available for future purchases of shares under approved repurchase program					76,800,000
Amortization expense from capitalized stock-based compensation			$ 2,000,000	$ 1,900,000	$ 3,900,000	$ 3,700,000

- Definition

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

+ References + Details

Stockholders' Equity (chedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	$ 24,801	$ 25,621	$ 47,732	$ 46,545
Less: Income tax benefit	(9,345)	(9,375)	(16,309)	(17,872)
Total stock-based compensation, net of taxes	15,456	16,246	31,423	28,673
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	2,718	3,063	5,345	5,769
Research and Development Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	3,867	4,901	8,236	8,831
Sales and Marketing Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	9,799	8,814	19,230	16,925
General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	8,417	8,843	14,921	15,020
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	3,104	4,366	6,293	7,466
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	1,705	1,885	1,705	1,885
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	21,608	19,734	42,526	38,462
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	1,629	1,471	3,391	2,865
Capitalized Internal Use Software [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Effect of stock-based compensation on income	$ (3,245)	$ (1,835)	$ (6,183)	$ (4,133)

Accumulated Other Comprehensive Income Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Tax portion of net unrealized gain (loss) on investments	$ (500)	$ 400
Amounts reclassified from OCI to net income	$ 0

Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Loss [Roll Forward]
Balance as of January 1, 2013, foreign currency translation			$ (2,354)
Balance as of January 1, 2013, net unrealized gain (loss) on investments			714
Balance as of January 1, 2013, total accumulated other comprehensive income			(1,640)
Other comprehensive loss, foreign currency translation	$ (3,746)	$ (3,702)	(7,760)	$ (3,030)
Other comprehensive loss, net of tax, net unrealized gain (loss) on investments	(1,626)	(99)	(1,555)	181
Other comprehensive loss, net of tax, total other comprehensive income	(5,372)	$ (3,801)	(9,315)	$ (2,849)
Balance as of June 30, 2013, foreign currency translation	(10,114)		(10,114)
Balance as of June 30, 2013, net unrealized gain (loss) on investments	(841)		(841)
Balance as of June 30, 2013, total accumulated other comprehensive income	$ (10,955)		$ (10,955)

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

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=20435746&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 12, 13
-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 133
-Paragraph 45
-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 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 31
-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 10: 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 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 18, 19, 22, 23, 24, 25, 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.

+ 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

Reference 1: 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=20435746&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-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 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 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 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 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References

+ Details

Goodwill and Other Intangible Assets Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 04, 2012	Sep. 13, 2012	Mar. 06, 2012	Feb. 07, 2012
Goodwill [Line Items]
Amortization of acquired intangible assets	$ 5,734	$ 5,463	$ 11,794	$ 10,230
Future amortization expense to be recognized in remainder of current year	9,600		9,600
Future amortization expense 2014	18,800		18,800
Future amortization expense 2015	16,200		16,200
Future amortization expense 2016	11,400		11,400
Future amortization expense 2017	$ 7,600		$ 7,600
Blaze Acquisition [Member]
Goodwill [Line Items]
Business acquisition purchase price allocation for goodwill								$ 15,100
Business acquisition purchase price allocation for intangible assets								$ 5,100
Cotendo Acquisition [Member]
Goodwill [Line Items]
Business acquisition purchase price allocation for goodwill							$ 233,800
Business acquisition purchase price allocation for intangible assets							$ 43,800
FastSoft [Member]
Goodwill [Line Items]
Business acquisition purchase price allocation for goodwill						$ 8,900
Business acquisition purchase price allocation for intangible assets						$ 3,700
Verivue [Member]
Goodwill [Line Items]
Business acquisition purchase price allocation for goodwill					$ 20,700
Business acquisition purchase price allocation for intangible assets					$ 7,500

Goodwill and Other Intangible Assets Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2013 USD ($)
Goodwill [Roll Forward]
Balance as of January 1, 2013	$ 731,325
Divestiture of Advertising Decision Solutions business	(1,939)
Balance as of June 30, 2013	$ 729,386

- 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 Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: 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 3: 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 4: 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 5: 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 6: 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 7: 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 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) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 175,791	$ 195,191
Accumulated amortization	(107,229)	(110,637)
Net carrying amount	68,562	84,554
Completed Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	62,331	71,531
Accumulated amortization	(30,666)	(32,842)
Net carrying amount	$ 31,665	$ 38,689
Weighted average amortization period (in years)	6 years	6 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 100,400	$ 104,700
Accumulated amortization	(71,533)	(68,702)
Net carrying amount	$ 28,867	$ 35,998
Weighted average amortization period (in years)	9 years	9 years
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 9,170	$ 14,770
Accumulated amortization	(3,716)	(7,645)
Net carrying amount	$ 5,454	$ 7,125
Weighted average amortization period (in years)	4 years	5 years
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 3,400	$ 3,700
Accumulated amortization	(824)	(958)
Net carrying amount	$ 2,576	$ 2,742
Weighted average amortization period (in years)	9 years	9 years
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)	10 years	10 years

Concentration of Credit Risk Narrtative (Details) - customers	Jun. 30, 2013	Dec. 31, 2012
Concentration of Credit Risk [Abstract]
Number of customers related to greater than 10% of accounts receivable	1	1

Segment and Geographic Information Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013 USD ($) countries customers	Jun. 30, 2012 countries customers	Jun. 30, 2013 USD ($) countries customers	Jun. 30, 2012 countries customers	Dec. 31, 2012 USD ($)
Segment Reporting Information [Line Items]
Property and equipment, net	$ 405,653		$ 405,653		$ 345,091
Number of foreign countries greater than 10% revenue \| countries	0	0	0	0
Number of customers accounted for 10% or more of total revenues \| customers	0	0	0	0
United States
Segment Reporting Information [Line Items]
Property and equipment, net	$ 264,300		$ 264,300		225,500
Outside the United States [Member]
Segment Reporting Information [Line Items]
Property and equipment, net	$ 141,400		$ 141,400		$ 119,600

Segment and Geographic Information Schedule of Revenue by Geographic Location (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segments, Geographical Areas [Abstract]
Percentage Of Revenue From Outside U S	29.00%	27.00%	29.00%	28.00%
Percentage Of Revenues Related To Europe	17.00%	17.00%	17.00%	17.00%

Income Taxes Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Income Taxes Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Effective income tax rate	34.00%	38.60%
Income tax adjustment	$ 1.4

Forward Currency Contracts Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Foreign Currency [Abstract]
Foreign currency transaction gain	$ 1.0	$ 0.5

- Definition

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

+ References + Details

Commitments, Contingencies and Guarantees Narrative (Details) $ in Thousands	Jun. 30, 2013 USD ($)
Bandwidth and purchase order commitments
Total	$ 152,578
Remainder of 2013	124,864
2014	22,012
2015	4,944
2016	559
2017	199
Bandwidth Usage And Co Location Services [Member]
Bandwidth and purchase order commitments
Total	73,034
Remainder of 2013	53,032
2014	16,244
2015	3,000
2016	559
2017	199
Open Vendor Purchase Orders [Member]
Bandwidth and purchase order commitments
Total	79,544
Remainder of 2013	71,832
2014	5,768
2015	1,944
2016	0
2017	$ 0

Commitments, Contingencies and Guarantees Minimum Aggregate Future Obligations Under Non-cancelable Leases (Details) $ in Thousands	Jun. 30, 2013 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remaining 2013	$ 13,355
2014	25,846
2015	23,845
2016	19,961
2017	19,113
Thereafter	34,169
Total	$ 136,289

Restructuring Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Restructuring Reserve [Roll Forward]
Beginning balance, January 1, 2013			$ 641
Restructuring charge (benefit)	$ 391	$ (46)	822	$ 14
Cash payments			621
Ending balance, June 30, 2013	842		842
Current portion of accrued restructuring	533		533		$ 275
Long-term portion of accrued restructuring	309		309
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Beginning balance, January 1, 2013			517
Restructuring charge (benefit)			0
Cash payments			61
Ending balance, June 30, 2013	456		456
Current portion of accrued restructuring	147		147
Long-term portion of accrued restructuring	309		309
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning balance, January 1, 2013			124
Restructuring charge (benefit)			822
Cash payments			560
Ending balance, June 30, 2013	386		386
Current portion of accrued restructuring	386		386
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