0001086222-20-000198 | 10-Q | XBRL Viewer

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Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2020	Aug. 04, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	0-27275
Entity Registrant Name	Akamai Technologies, Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3432319
Entity Address, Address Line One	145 Broadway
Entity Address, City or Town	Cambridge
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02142
City Area Code	617
Local Phone Number	444-3000
Title of 12(b) Security	Common Stock - par value $0.01 per share
Trading Symbol	AKAM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		162,704,861
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001086222
Current Fiscal Year End Date	--12-31

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 572,288	$ 393,745
Marketable securities	800,321	1,143,249
Accounts receivable, net of reserves of $6,225 and $1,880 at June 30, 2020, and December 31, 2019, respectively	644,659	551,943
Prepaid expenses and other current assets	175,731	142,676
Total current assets	2,192,999	2,231,613
Marketable securities	1,018,835	835,384
Property and equipment, net	1,281,392	1,152,153
Operating lease right-of-use assets	736,465	758,450
Acquired intangible assets, net	194,951	179,431
Goodwill	1,595,304	1,600,265
Deferred income tax assets	61,310	76,528
Other assets	143,542	173,062
Total assets	7,224,798	7,006,886
Current liabilities:
Accounts payable	153,958	138,946
Accrued expenses	263,646	334,861
Deferred revenue	93,648	71,223
Operating lease liabilities	138,478	139,463
Other current liabilities	7,692	8,843
Total current liabilities	657,422	693,336
Deferred revenue	4,536	4,368
Deferred income tax liabilities	29,556	29,187
Convertible senior notes	1,872,937	1,839,791
Operating lease liabilities	673,678	692,181
Other liabilities	82,374	90,065
Total liabilities	3,320,503	3,348,928
Commitments and contingencies
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; 163,773,348 shares issued and 162,630,477 shares outstanding at June 30, 2020, and 162,000,843 shares issued and outstanding at December 31, 2019	1,638	1,620
Additional paid-in capital	3,734,787	3,653,486
Accumulated other comprehensive loss	(57,307)	(45,144)
Treasury stock, at cost, 1,142,871 shares at June 30, 2020, and no shares at December 31, 2019	(107,880)	0
Retained earnings	333,057	47,996
Total stockholders’ equity	3,904,295	3,657,958
Total liabilities and stockholders’ equity	$ 7,224,798	$ 7,006,886

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable reserve	$ 6,225	$ 1,880
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares designated as Series A Junior Participating Preferred Stock (in shares)	700,000	700,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	700,000,000	700,000,000
Common stock, shares issued (in shares)	163,773,348	162,000,843
Common stock, shares outstanding (in shares)	162,630,477	162,000,843
Treasury stock (in shares)	1,142,871	0

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 794,715	$ 705,074	$ 1,559,017	$ 1,411,582
Costs and operating expenses:
Cost of revenue (exclusive of amortization of acquired intangible assets shown below)	276,804	242,193	545,386	482,936
Research and development	64,090	61,439	135,314	127,580
Sales and marketing	123,469	135,106	247,255	261,382
General and administrative	129,709	120,116	257,070	242,951
Amortization of acquired intangible assets	10,381	9,648	20,815	19,247
Restructuring (benefit) charge	(167)	790	10,418	7,179
Total costs and operating expenses	604,286	569,292	1,216,258	1,141,275
Income from operations	190,429	135,782	342,759	270,307
Interest income	9,502	6,410	16,545	15,045
Interest expense	(17,249)	(8,446)	(34,454)	(20,562)
Other expense, net	(1,603)	(578)	(5,711)	(67)
Income before provision for income taxes	181,079	133,168	319,139	264,723
Provision for income taxes	(18,671)	(19,253)	(32,963)	(43,678)
Loss from equity method investment	(493)	0	(1,115)	0
Net income	$ 161,915	$ 113,915	$ 285,061	$ 221,045
Net income per share:
Basic (in dollars per share)	$ 1.00	$ 0.70	$ 1.76	$ 1.35
Diluted (in dollars per share)	$ 0.98	$ 0.69	$ 1.74	$ 1.34
Shares used in per share calculations:
Basic (in shares)	162,413	163,407	162,203	163,322
Diluted (in shares)	164,768	165,019	164,226	164,903

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 161,915	$ 113,915	$ 285,061	$ 221,045
Other comprehensive income (loss):
Foreign currency translation adjustments	5,808	2,849	(20,469)	3,351
Change in unrealized (loss) gain on investments, net of income tax benefit (provision) of $(5,144), $(547), $(3,679) and $(1,101) for the three and six months ended June 30, 2020 and 2019, respectively	15,880	1,646	8,306	3,077
Other comprehensive income (loss)	21,688	4,495	(12,163)	6,428
Comprehensive income	$ 183,603	$ 118,410	$ 272,898	$ 227,473

- Definition

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

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+ Details

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Income tax provision	$ 5,144	$ 547	$ 3,679	$ 1,101

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 285,061	$ 221,045
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	231,788	214,270
Stock-based compensation	96,684	93,447
Provision for deferred income taxes	11,394	24,608
Amortization of debt discount and issuance costs	31,310	19,628
Other non-cash reconciling items, net	14,804	1,180
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(105,546)	(38,127)
Prepaid expenses and other current assets	(9,979)	(23,287)
Accounts payable and accrued expenses	(47,402)	(52,789)
Deferred revenue	21,342	27,973
Other current liabilities	(1,115)	(18,739)
Other non-current assets and liabilities	(6,407)	9,570
Net cash provided by operating activities	521,934	478,779
Cash flows from investing activities:
Cash received (paid) for business acquisitions, net of cash acquired	106	(121,409)
Cash paid for asset acquisition	(36,376)	0
Cash paid for equity method investment	0	(36,008)
Purchases of property and equipment	(214,952)	(158,158)
Capitalization of internal-use software development costs	(120,716)	(117,620)
Purchases of short- and long-term marketable securities	(842,516)	(391,758)
Proceeds from sales of short- and long-term marketable securities	29,667	268
Proceeds from maturities of short- and long-term marketable securities	984,333	649,262
Other non-current assets and liabilities	79	2,237
Net cash used in investing activities	(200,375)	(173,186)
Cash flows from financing activities:
Repayment of convertible senior notes	0	(690,000)
Proceeds related to the issuance of common stock under stock plans	29,805	28,772
Employee taxes paid related to net share settlement of stock-based awards	(63,930)	(49,956)
Repurchases of common stock	(107,880)	(116,247)
Other non-current assets and liabilities	0	(1,558)
Net cash used in financing activities	(142,005)	(828,989)
Effects of exchange rate changes on cash, cash equivalents and restricted cash	(828)	2,678
Net increase (decrease) in cash, cash equivalents and restricted cash	178,726	(520,718)
Cash, cash equivalents and restricted cash at beginning of period	394,146	1,036,987
Cash, cash equivalents and restricted cash at end of period	572,872	516,269
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds received of $6,711 and $2,216 for the six months ended June 30, 2020 and 2019, respectively	26,409	54,271
Cash paid for interest expense	3,079	719
Cash paid for operating lease liabilities	94,157	69,317
Non-cash activities:
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	65,832	63,709
Purchases of property and equipment and capitalization of internal-use software development costs included in accounts payable and accrued expenses	98,235	71,066
Capitalization of stock-based compensation	$ 18,856	$ 18,760

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement of Cash Flows [Abstract]
Proceeds from income tax refunds	$ 6,711	$ 2,216
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	572,288	515,896
Restricted cash	584	373
Cash, cash equivalents and restricted cash	$ 572,872	$ 516,269

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative-effect adjustment to accumulated deficit	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Treasury Stock	Retained Earnings (Accumulated Deficit)	Retained Earnings (Accumulated Deficit) Cumulative-effect adjustment to accumulated deficit
Beginning balance (in shares) at Dec. 31, 2018			162,904,550
Beginning Balance at Dec. 31, 2018	$ 3,191,860	$ 851	$ 1,629	$ 3,670,033	$ (48,912)	$ 0	$ (430,890)	$ 851
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			1,528,391
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(48,911)		$ 15	(48,926)
Issuance of common stock under employee stock purchase plan (in shares)			473,462
Issuance of common stock under employee stock purchase plan	27,669		$ 5	27,664
Stock-based compensation	112,069			112,069
Repurchases of common stock (in shares)			(1,547,312)
Repurchases of common stock	(116,247)					(116,247)
Net income	221,045						221,045
Foreign currency translation adjustments	3,351				3,351
Change in unrealized gain (loss) on investments, net of tax	3,077				3,077
Ending balance (in shares) at Jun. 30, 2019			163,359,091
Ending Balance at Jun. 30, 2019	3,394,764		$ 1,649	3,760,840	(42,484)	(116,247)	(208,994)
Beginning balance (in shares) at Mar. 31, 2019			163,503,258
Beginning Balance at Mar. 31, 2019	3,283,217		$ 1,640	3,686,337	(46,979)	(34,872)	(322,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			437,733
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(11,147)		$ 4	(11,151)
Issuance of common stock under employee stock purchase plan (in shares)			473,462
Issuance of common stock under employee stock purchase plan	27,669		$ 5	27,664
Stock-based compensation	57,990			57,990
Repurchases of common stock (in shares)			(1,055,362)
Repurchases of common stock	(81,375)					(81,375)
Net income	113,915						113,915
Foreign currency translation adjustments	2,849				2,849
Change in unrealized gain (loss) on investments, net of tax	1,646				1,646
Ending balance (in shares) at Jun. 30, 2019			163,359,091
Ending Balance at Jun. 30, 2019	3,394,764		$ 1,649	3,760,840	(42,484)	(116,247)	(208,994)
Beginning balance (in shares) at Dec. 31, 2019			162,000,843
Beginning Balance at Dec. 31, 2019	3,657,958		$ 1,620	3,653,486	(45,144)	0	47,996
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			1,378,584
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(63,292)		$ 14	(63,306)
Issuance of common stock under employee stock purchase plan (in shares)			393,921
Issuance of common stock under employee stock purchase plan	29,170		$ 4	29,166
Stock-based compensation	115,441			115,441
Repurchases of common stock (in shares)			(1,142,871)
Repurchases of common stock	(107,880)					(107,880)
Net income	285,061
Foreign currency translation adjustments	(20,469)
Change in unrealized gain (loss) on investments, net of tax	8,306				8,306
Ending balance (in shares) at Jun. 30, 2020			162,630,477
Ending Balance at Jun. 30, 2020	3,904,295		$ 1,638	3,734,787	(57,307)	(107,880)	333,057
Beginning balance (in shares) at Mar. 31, 2020			162,176,589
Beginning Balance at Mar. 31, 2020	3,672,218		$ 1,631	3,658,990	(78,995)	(80,550)	171,142
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes (in shares)			331,544
Issuance of common stock upon the exercise of stock options and vesting of restricted and deferred stock units, net of shares withheld for employee taxes	(12,592)		$ 3	(12,595)
Issuance of common stock under employee stock purchase plan (in shares)			393,921
Issuance of common stock under employee stock purchase plan	29,170		$ 4	29,166
Stock-based compensation	59,226			59,226
Repurchases of common stock (in shares)			(271,577)
Repurchases of common stock	(27,330)					(27,330)
Net income	161,915						161,915
Foreign currency translation adjustments	5,808				5,808
Change in unrealized gain (loss) on investments, net of tax	15,880				15,880
Ending balance (in shares) at Jun. 30, 2020			162,630,477
Ending Balance at Jun. 30, 2020	$ 3,904,295		$ 1,638	$ 3,734,787	$ (57,307)	$ (107,880)	$ 333,057

Nature of Business and Basis of Presentation	6 Months Ended
Nature of Business and Basis of Presentation	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	Nature of Business and Basis of Presentation Akamai Technologies, Inc. (the “Company”) provides solutions for delivering, optimizing and securing content and business applications over the Internet. Its globally-distributed platform comprises approximately 300,000 servers across more than 130 countries. The Company was incorporated in Delaware in 1998 and is headquartered in Cambridge, Massachusetts. The Company currently operates in one industry segment: providing cloud services for delivering, optimizing and securing content and business 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 the Company 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 in, or omitted from, 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 the Company’s annual report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission on February 28, 2020. 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, consisting only of normal recurring adjustments, that are necessary for a fair statement of the results of all interim periods reported herein. Newly-Adopted Accounting Pronouncements In June 2016, the Financial Accounting Standards Board ("FASB") issued guidance that introduces a new methodology for accounting for credit losses on financial instruments. The guidance establishes a new "expected credit loss model" that requires entities to estimate current expected credit losses on financial instruments by using all practical and relevant information. Any expected credit losses are to be reflected as allowances. The Company prospectively adopted this standard on January 1, 2020. Adoption of the standard did not have a material impact on the Company's consolidated financial statements. In August 2018, the FASB issued guidance that addresses a customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The guidance aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance for capitalizing costs associated with developing or obtaining internal-use software. The Company prospectively adopted this standard on January 1, 2020. Adoption of the standard did not have a material impact on the Company's consolidated financial statements. Recent Accounting Pronouncements In August 2020, the FASB issued guidance that is expected to reduce complexity and improve comparability of financial reporting associated with accounting for convertible instruments and contracts in an entity’s own equity. This guidance will be effective for the Company on January 1, 2022. The Company is evaluating the potential impact of adopting this new accounting guidance on its consolidated financial statements.

Fair Value Measurements

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

The following is a summary of available-for-sale marketable securities held as of June 30, 2020 and December 31, 2019 (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, 2020

Commercial paper	$	26,897	$	77	$	(1)	$	26,973	$	26,973	$	—
Corporate bonds	1,399,255		12,877		(339)		1,411,793		692,231		719,562
U.S. government agency obligations	362,188		866		(47)		363,007		80,851		282,156
	$	1,788,340	$	13,820	$	(387)	$	1,801,773	$	800,055	$	1,001,718

As of December 31, 2019
Certificates of deposit	$	150,000	$	—	$	—	$	150,000	$	150,000	$	—
Commercial paper	73,829		23		(7)		73,845		73,845		—
Corporate bonds	1,368,668		1,840		(378)		1,370,130		753,538		616,592
U.S. government agency obligations	369,475		80		(74)		369,481		165,623		203,858
	$	1,961,972	$	1,943	$	(459)	$	1,963,456	$	1,143,006	$	820,450

The Company offers certain eligible employees the ability to participate in a non-qualified deferred compensation plan. The mutual funds held by the Company that are associated with this plan are classified as restricted trading securities. These securities are not included in the available-for-sale securities table above but are included in marketable securities in the consolidated balance sheets.

Unrealized gains and unrealized temporary losses on investments classified as available-for-sale are included within accumulated other comprehensive loss in the consolidated balance sheets. Upon realization, those amounts are reclassified from accumulated other comprehensive loss to interest income in the consolidated statements of income. As of June 30, 2020, the Company held for investment a corporate bond with a fair value of $1.6 million, which was classified as an available-for-sale marketable security that had been in a continuous unrealized loss position for more than 12 months. The immaterial unrealized loss related to this corporate bond is included in accumulated other comprehensive loss.

The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets as of June 30, 2020 and December 31, 2019 (in thousands):


	Total Fair Value		Fair Value Measurements at Reporting Date Using
					Level 1			Level 2
As of June 30, 2020
Money market funds	$	104,131	$	104,131		$	—

Commercial paper	26,973		—			26,973
Corporate bonds	1,411,793		—			1,411,793
U.S. government agency obligations	363,007		—			363,007
Mutual funds	17,383		17,383			—
	$	1,923,287	$	121,514		$	1,801,773




As of December 31, 2019
Money market funds	$	50,779	$	50,779		$	—
Certificates of deposit	150,000		—			150,000
Commercial paper	73,845		—			73,845
Corporate bonds	1,370,130		—			1,370,130
U.S. government agency obligations	369,481		—			369,481
Mutual funds	15,177		15,177			—
	$	2,029,412	$	65,956		$	1,963,456

As of June 30, 2020 and December 31, 2019, the Company grouped money market funds and mutual funds using a Level 1 valuation because market prices for such investments are readily available in active markets. As of June 30, 2020 and December 31, 2019, the Company grouped commercial paper, corporate bonds and U.S. government agency obligations using a Level 2 valuation because quoted prices for similar assets in active markets (or identical assets in an inactive market) are available. As of December 31, 2019, the Company also included bank certificates of deposit using Level 2 valuation because quoted prices for similar assets in active markets (or identical assets in an inactive market) are available. The Company did not have any transfers of assets between Level 1, Level 2 or Level 3 of the fair value measurement hierarchy during the six months ended June 30, 2020.

When developing fair value estimates, the Company maximizes the use of observable inputs and minimizes the use of unobservable inputs. When available, the Company uses quoted market prices to measure fair value. The valuation technique used to measure fair value for the Company's 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 primarily use market-based parameters including yield curves, volatilities, credit ratings and currency rates. In certain cases where market rate assumptions are not available, the Company is required to make judgments about assumptions market participants would use to estimate the fair value of a financial instrument.

Contractual maturities of the Company’s available-for-sale marketable securities held as of June 30, 2020 and December 31, 2019 were as follows (in thousands):


	June 30, 2020		December 31, 2019
Due in 1 year or less	$	800,055	$	1,143,006
Due after 1 year through 3 years	1,001,718		820,450
	$	1,801,773	$	1,963,456

Accounts Receivable

6 Months Ended

Jun. 30, 2020

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

Accounts Receivable

Net accounts receivable consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Trade accounts receivable	$	482,451	$	396,204
Unbilled accounts receivable	168,433		157,619
Gross accounts receivable	650,884		553,823
Allowances for current expected credit losses and other reserves	(6,225)		(1,880)
Accounts receivable, net	$	644,659	$	551,943

The following table summarizes the activity of the Company's allowance for current expected credit losses and other reserves during the six months ended June 30, 2020 (in thousands):


Balance as of January 1, 2020	$	1,880
Charges to income from operations	7,523
Collections from customers previously reserved and other	(3,178)
Balance as of June 30, 2020	$	6,225

The allowance for current expected credit losses has been developed using historical loss rates for the previous twelve months as well as expectations about the future where the Company has been able to develop forecasts to support its estimates.

Incremental Costs to Obtain a Contract with a Customer

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Incremental Costs to Obtain a Contract with a Customer

The following table summarizes the deferred costs associated with obtaining customer contracts, specifically commission and incentive payments, as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Deferred costs included in prepaid and other current assets	$	43,220	$	45,009
Deferred costs included in other assets	19,816		25,698
Total deferred costs	$	63,036	$	70,707

During the three and six months ended June 30, 2020, the Company recognized $16.1 million and $30.2 million, respectively, of amortization expense related to deferred costs. During the three and six months ended June 30, 2019, the Company recognized $10.8 million and $21.6 million, respectively, of amortization expense related to deferred costs. Amortization expense related to deferred costs is primarily included in sales and marketing expense in the consolidated statements of income.

Revenue from Contracts with Customers

The Company sells its solutions through a sales force located both domestically and abroad. Revenue derived from operations outside of the U.S. is determined based on the country in which the sale originated. Other than the U.S., no single country accounted for 10% or more of the Company’s total revenue for any reported period. The following table summarizes revenue by geography included in the Company’s consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
U.S.	$	443,668	$	416,859	$	872,598	$	835,059
International	351,047		288,215		686,419		576,523
Total revenue	$	794,715	$	705,074	$	1,559,017	$	1,411,582

While the Company sells its solutions through a geographically dispersed sales force, it manages its customer relationships in two divisions: the Web Division and the Media and Carrier Division. Customers are assigned to a division for relationship management purposes according to their predominant purchasing activity; however, customers may purchase solutions managed by the other division as well. As of January 1, 2020, the Company reassigned some of its customers between the Media and Carrier Division and the Web Division and revised historical results in order to reflect the most recent categorization and to provide a comparable view for all periods presented. As the purchasing patterns and required account expertise of customers change over time, the Company may reassign a customer's division from one to another. The following table summarizes revenue by division included in the Company’s consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Web Division	$	404,342	$	377,558	$	810,337	$	751,760
Media and Carrier Division	390,373		327,516		748,680		659,822
Total revenue	$	794,715	$	705,074	$	1,559,017	$	1,411,582

Most content delivery and security services sold by the Company represent obligations that are satisfied over time as the customer simultaneously receives and consumes the services provided. Accordingly, the majority of the Company's revenue is recognized over time, generally ratably over the term of the arrangement due to consistent monthly traffic commitments that expire each period. A small percentage of the Company's services are satisfied at a point in time, such as one-time professional services contracts, integration services and most license sales where the primary obligation is delivery of the license at the start of the term. In these cases, revenue is recognized at a point in time of delivery or satisfaction of the performance obligation.

During the six months ended June 30, 2020 and 2019, the Company recognized $59.7 million and $52.8 million of revenue that was included in deferred revenue as of December 31, 2019 and 2018, respectively.

As of June 30, 2020, the aggregate amount of remaining performance obligations from contracts with customers was $2.5 billion. The Company expects to recognize approximately 70% of its remaining performance obligations as revenue over the next 12 months, with the remaining recognized thereafter. Remaining performance obligations represent the amount of the transaction price under contracts with customers that are attributable to performance obligations that are unsatisfied or partially satisfied at the reporting date. This consists of future committed revenue for monthly, quarterly or annual periods within current contracts with customers, as well as deferred revenue arising from consideration invoiced in prior periods for which the related performance obligations have not been satisfied. It excludes estimates of variable consideration such as usage-based contracts with no committed contract as well as anticipated renewed contracts.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Goodwill and Acquired Intangible Assets

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Acquired Intangible Assets

The change in the carrying amount of goodwill for the six months ended June 30, 2020 was as follows (in thousands):


Balance as of January 1, 2020	$	1,600,265

Measurement period adjustments related to acquisitions completed in prior years	(1,056)
Foreign currency translation	(3,905)
Balance as of June 30, 2020	$	1,595,304

The Company tests goodwill for impairment at least annually. Through the date the consolidated financial statements were issued, no triggering events had occurred that would indicate a potential impairment exists.

Acquired intangible assets that are subject to amortization consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020										December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Completed technology	$	154,170	$	(102,539)	$	51,631	$	153,722	$	(94,088)	$	59,634
Customer-related intangible assets	315,465		(174,845)		140,620		279,684		(163,155)		116,529
Non-compete agreements	819		(657)		162		830		(529)		301
Trademarks and trade names	7,548		(5,010)		2,538		7,600		(4,633)		2,967
Acquired license rights	490		(490)		—		490		(490)		—
Total	$	478,492	$	(283,541)	$	194,951	$	442,326	$	(262,895)	$	179,431

Aggregate expense related to amortization of acquired intangible assets for the three and six months ended June 30, 2020 was $10.4 million and $20.8 million, respectively. Aggregate expense related to amortization of acquired intangible assets for the three and six months ended June 30, 2019 was $9.6 million and $19.2 million, respectively. Based on the Company’s acquired intangible assets as of June 30, 2020, aggregate expense related to amortization of acquired intangible assets is expected to be $21.1 million for the remainder of 2020, and $43.0 million, $37.3 million, $28.9 million and $20.5 million for 2021, 2022, 2023 and 2024, respectively.

Acquisitions	6 Months Ended
Acquisitions	Jun. 30, 2020
Asset Acquisition [Abstract]
Acquisitions	AcquisitionsIn February 2020, the Company acquired certain assets from Instart Logic, Inc. ("Instart"), a provider of cloud solutions for improving web and mobile application performance, for $36.4 million in cash. The purchase price was primarily allocated to a customer-related intangible asset that will be amortized over 17 years in a pattern that matches expense with expected economic benefits. The Company is transitioning the acquired customers to its Intelligent Edge Platform.

Debt

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Debt

Convertible Notes – Due 2027

In August 2019, the Company issued $1,150.0 million in par value of convertible senior notes due 2027 (the "2027 Notes"). The 2027 Notes are senior unsecured obligations of the Company, bear regular interest of 0.375%, payable semi-annually in arrears on March 1 and September 1 of each year and mature on September 1, 2027, unless repurchased or converted in accordance with their terms prior to maturity.

At their option, holders may convert their 2027 Notes prior to the close of business on the business day immediately preceding May 1, 2027, only under the following circumstances:

•during any calendar quarter commencing after the calendar quarter ended December 31, 2019 (and only during such calendar quarter), if the last reported sale price of the Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

•during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of 2027 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or

•upon the occurrence of specified corporate events.

On or after May 1, 2027, holders may convert all or any portion of their 2027 Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date.

Upon conversion, the Company, at its election, may pay or deliver to holders cash, shares of the Company's common stock or a combination of cash and shares of the Company's common stock. The initial conversion rate is 8.6073 shares of the Company's common stock per $1,000 principal amount, which is equivalent to an initial conversion price of approximately $116.18 per share, subject to adjustments in certain events, and represents a potential conversion into 9.9 million shares.

In accounting for the issuance of the 2027 Notes, the Company separated the 2027 Notes into liability and equity components. The carrying cost of the liability component was calculated by measuring the fair value of a similar debt obligation that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the 2027 Notes. The difference between the principal amount of the 2027 Notes and the proceeds allocated to the liability component (“debt discount”) is amortized to interest expense using the effective interest method over the term of the 2027 Notes. The equity component is recorded in additional paid-in capital in the consolidated balance sheet and will not be remeasured as long as it continues to meet the conditions for equity classification.

In accounting for the transaction costs related to the issuance of the 2027 Notes, the Company allocated the total transaction costs incurred to the liability and equity components based on their relative values. Transaction costs attributable to the liability component are being amortized to interest expense over the term of the 2027 Notes, and transaction costs attributable to the equity component are netted against the equity component of the 2027 Notes in stockholders’ equity.

The 2027 Notes consisted of the following components as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Liability component:
Principal	$	1,150,000	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(209,737)		(222,928)
Net carrying amount	$	940,263	$	927,072

Equity component:	$	220,529	$	220,529

The estimated fair value of the 2027 Notes at June 30, 2020 and December 31, 2019 was $1,251.8 million and $1,133.8 million, respectively. The fair value was determined based on the quoted price of the 2027 Notes in an inactive market on the last trading day of the reporting period and has been classified as Level 2 within the fair value hierarchy. Based on the closing price of the Company's common stock of $107.09 on June 30, 2020, the value of the 2027 Notes if converted to common stock was more than the principal amount of $1,150.0 million.

The Company used $100.0 million of the proceeds from the offering to repurchase shares of its common stock, concurrent with the issuance of the 2027 Notes. The repurchase was made in accordance with a share repurchase program previously approved by the Board of Directors. Additionally, $127.1 million of the proceeds was used for the net cost of convertible note hedge and warrant transactions. The net proceeds are intended to be used for working capital, share repurchases, potential acquisitions and strategic transactions and other corporate purposes.

Note Hedge

To minimize the impact of potential dilution upon conversion of the 2027 Notes, the Company entered into convertible note hedge transactions with respect to its common stock in August 2019. The Company paid $312.2 million for the note hedge transactions. The note hedge transactions cover approximately 9.9 million shares of the Company’s common stock at a strike price that corresponds to the initial conversion price of the 2027 Notes, also subject to adjustment, and are exercisable upon conversion of the 2027 Notes. The note hedge transactions are intended to reduce dilution in the event of conversion of the 2027 Notes.

Warrants

Separately, in August 2019, the Company entered into warrant transactions, whereby the Company sold warrants to acquire, subject to anti-dilution adjustments, up to 9.9 million shares of the Company’s common stock at a strike price of approximately $178.74 per share. The Company received aggregate proceeds of $185.2 million from the sale of the warrants. The convertible note hedge and warrant transactions will generally have the effect of increasing the conversion price of the 2027 Notes to approximately $178.74 per share.

Convertible Notes – Due 2025

In May 2018, the Company issued $1,150.0 million in par value of convertible senior notes due 2025 (the "2025 Notes"). The 2025 Notes are senior unsecured obligations of the Company, bear regular interest of 0.125%, payable semi-annually on May 1 and November 1 of each year, and mature on May 1, 2025, unless repurchased or converted prior to maturity.

At their option, holders may convert their 2025 Notes prior to the close of business on the business day immediately preceding January 1, 2025, only under the following circumstances:

•during any calendar quarter commencing after the calendar quarter ended June 30, 2018 (and only during such calendar quarter), if the last reported sale price of the Company's common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;

•during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of 2025 Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company's common stock and the conversion rate on each such trading day; or

•upon the occurrence of specified corporate events.

On or after January 1, 2025, holders may convert all or any portion of their 2025 Notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, regardless of the foregoing circumstances.

Upon conversion, the Company, at its election, may pay or deliver to holders cash, shares of the Company's common stock or a combination of cash and shares of the Company's common stock. The initial conversion rate is 10.5150 shares of the Company's common stock per $1,000 principal amount, which is equivalent to an initial conversion price of approximately $95.10 per share, subject to adjustments in certain events, and represents a potential conversion into 12.1 million shares.

In accounting for the issuance of the 2025 Notes, the Company separated the 2025 Notes into liability and equity components. The carrying cost of the liability component was calculated by measuring the fair value of a similar debt obligation that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the 2025 Notes. The difference between the principal amount of the 2025 Notes and the proceeds allocated to the liability component (“debt discount”) is amortized to interest expense using the effective interest method over the term of the 2025 Notes. The equity component is recorded in additional paid-in capital in the consolidated balance sheet and will not be remeasured as long as it continues to meet the conditions for equity classification.

In accounting for the transaction costs related to the issuance of the 2025 Notes, the Company allocated the total transaction costs incurred to the liability and equity components based on their relative values. Transaction costs attributable to the liability component are being amortized to interest expense over the term of the 2025 Notes, and transaction costs attributable to the equity component are netted against the equity component of the 2025 Notes in stockholders’ equity.

The 2025 Notes consisted of the following components as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Liability component:
Principal	$	1,150,000	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(217,326)		(237,281)
Net carrying amount	$	932,674	$	912,719

Equity component:	$	285,225	$	285,225

The estimated fair value of the 2025 Notes at June 30, 2020 and December 31, 2019 was $1,427.2 million and $1,270.7 million, respectively. The fair value was determined based on the quoted price of the 2025 Notes in an inactive market on the last trading day of the reporting period and has been classified as Level 2 within the fair value hierarchy. Based on the closing price of the Company's common stock of $107.09 on June 30, 2020, the value of the 2025 Notes if converted to common stock was more than the principal amount of $1,150.0 million.

The Company used $46.2 million of the proceeds from the offering to repurchase shares of its common stock, concurrent with the issuance of the 2025 Notes. The repurchase was made in accordance with a share repurchase program previously approved by the Board of Directors. Additionally, $141.8 million of the proceeds was used for the net cost of convertible note hedge and warrant transactions. The Company also used a portion of the net proceeds to repay at maturity the $690.0 million in par value of convertible senior notes due in 2019.

Note Hedge

To minimize the impact of potential dilution upon conversion of the 2025 Notes, the Company entered into convertible note hedge transactions with respect to its common stock in May 2018. The Company paid $261.7 million for the note hedge transactions. The note hedge transactions cover approximately 12.1 million shares of the Company’s common stock at a strike price that corresponds to the initial conversion price of the 2025 Notes, also subject to adjustment, and are exercisable upon conversion of the 2025 Notes. The note hedge transactions are intended to reduce dilution in the event of conversion of the 2025 Notes.

Warrants

Separately, in May 2018, the Company entered into warrant transactions, whereby the Company sold warrants to acquire, subject to anti-dilution adjustments, up to 12.1 million shares of the Company’s common stock at a strike price of approximately $149.18 per share. The Company received aggregate proceeds of $119.9 million from the sale of the warrants. The convertible note hedge and warrant transactions will generally have the effect of increasing the conversion price of the 2025 Notes to approximately $149.18 per share.

Convertible Notes – Due 2019

In February 2014, the Company issued $690.0 million in par value of convertible senior notes due 2019 (the "2019 Notes"). The 2019 Notes were senior unsecured obligations of the Company and did not bear regular interest. The 2019 Notes matured and were repaid in full on February 15, 2019 as no repurchases or conversions occurred prior to maturity.

Revolving Credit Facility

In May 2018, the Company entered into a $500.0 million five-year, revolving credit agreement (the “Credit Agreement”). Borrowings under the Credit Agreement may be used to finance working capital needs and for general corporate purposes. The Credit Agreement provides for an initial $500.0 million in revolving loans. Under specified circumstances, the facility can be increased to up to $1.0 billion in aggregate principal amount. The Credit Agreement expires in May 2023.

Borrowings under the Credit Agreement bear interest, at the Company's option, at a base rate plus a spread of 0.00% to 0.25% or an adjusted LIBOR rate plus a spread of 0.875% to 1.25%, in each case with such spread being determined based on the Company's consolidated leverage ratio specified in the Credit Agreement. Regardless of what amounts, if any, are outstanding under the Credit Agreement, the Company is also obligated to pay an ongoing commitment fee on undrawn amounts at a rate of 0.075% to 0.15%, with such rate being based on the Company's consolidated leverage ratio specified in the Credit Agreement.

The Credit Agreement contains customary representations and warranties, affirmative and negative covenants and events of default. Principal covenants include a maximum consolidated leverage ratio and a minimum consolidated interest coverage ratio. There were no outstanding borrowings under the Credit Agreement as of June 30, 2020.

Interest Expense

The 2027 Notes bear interest at a fixed rate of 0.375%. The interest is payable semi-annually on March 1 and September 1 of each year. The 2027 Notes have an effective interest rate of 3.1% attributable to the conversion feature. The 2025 Notes bear interest at a fixed rate of 0.125%. The interest is payable semi-annually on May 1 and November 1 of each year, commencing in November 2018. The 2025 Notes have an effective interest rate of 4.26% attributable to the conversion feature. The 2019 Notes did not bear regular interest, but had an effective interest rate of 3.2% attributable to the conversion feature. The Company is also obligated to pay ongoing commitment fees under the terms of the Credit Agreement. The following table sets forth total interest expense included in the consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Amortization of debt discount and issuance costs	$	16,709	$	9,666	$	33,264	$	22,675
Coupon interest payable on 2025 Notes	359		359		718		718
Coupon interest payable on 2027 Notes	1,078		—		2,156		—
Revolving credit facility contractual interest expense	135		77		270		216
Capitalization of interest expense	(1,032)		(1,656)		(1,954)		(3,047)
Total interest expense	$	17,249	$	8,446	$	34,454	$	20,562

Restructuring

6 Months Ended

Jun. 30, 2020

Restructuring and Related Activities [Abstract]

Restructuring

During the fourth quarter of 2019, management committed to an action to restructure certain parts of the Company to focus on investments with the potential to accelerate revenue growth. As a result, certain headcount reductions were necessary and certain capitalized internal-use software charges were realized for software not yet placed into service that will not be completed and implemented due to this action. The Company has incurred restructuring charges of $20.6 million as part of this action, of which $10.4 million was recognized during the six months ended June 30, 2020. Included in the charge is $6.2 million related to impairment of a right-of-use asset related to the exit of a leased facility. The Company does not expect to incur material additional restructuring charges related to this action.

During the fourth quarter of 2018, management committed to an action to restructure certain parts of the Company with the intent of re-balancing investments to ensure long-term growth and scale. As a result, certain headcount reductions were necessary and certain capitalized internal-use software charges were realized for software not yet placed into service that will not be completed and implemented due to this action. The Company has incurred restructuring charges of $19.0 million as part of this action, of which $0.8 million and $7.0 million, respectively, was incurred during the three and six months ended June 30, 2019. There were no charges related to these actions during the six months ended June 30, 2020, and no additional charges are expected.

The following table summarizes the activity of the Company's restructuring accrual during the six months ended June 30, 2020 (in thousands):


	Employee Severance and Related Benefits		Software Charges		Other		Total
Balance as of January 1, 2020	$	5,707	$	99	$	151	$	5,957
Costs incurred	4,168		—		49		4,217
Cash disbursements	(9,398)		(99)		(175)		(9,672)
Non-cash charges	—		—		(11)		(11)

Balance as of June 30, 2020	$	477	$	—	$	14	$	491

Stockholders' Equity

6 Months Ended

Jun. 30, 2020

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

Share Repurchase Program

Effective November 2018, the Board of Directors of the Company authorized a $1.1 billion share repurchase program through December 2021. During the three and six months ended June 30, 2020, the Company repurchased 0.3 million and 1.1 million shares of its common stock, respectively, for $27.3 million and $107.9 million, respectively. The Company's goals for the share repurchase program are to offset the dilution created by its employee equity compensation programs over time and provide the flexibility to return capital to shareholders as business and market conditions warrant.

Stock-Based Compensation

The following table summarizes stock-based compensation included in the Company’s consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Cost of revenue	$	6,254	$	5,793	$	11,990	$	11,362
Research and development	11,549		12,044		23,614		24,101
Sales and marketing	16,011		15,740		31,746		30,791
General and administrative	15,377		14,565		29,334		27,193
Total stock-based compensation	49,191		48,142		96,684		93,447
Provision for income taxes	(16,823)		(13,798)		(29,459)		(26,791)
Total stock-based compensation, net of income taxes	$	32,368	$	34,344	$	67,225	$	66,656

In addition to the amounts of stock-based compensation reported in the table above, the Company’s consolidated statements of income for the three and six months ended June 30, 2020 include stock-based compensation reflected as a component of amortization of capitalized internal-use software of $7.2 million and $14.8 million, respectively, before taxes, and for the three and six months ended June 30, 2019, include stock-based compensation reflected as a component of amortization of capitalized internal-use software of $7.3 million and $15.4 million, respectively, before taxes.

Accumulated Other Comprehensive Loss

6 Months Ended

Jun. 30, 2020

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

Accumulated Other Comprehensive Loss

The following table summarizes the changes in accumulated other comprehensive loss, net of tax, which is reported as a component of stockholders' equity, for the six months ended June 30, 2020 (in thousands):


	Foreign Currency Translation		Net Unrealized Gains on Investments		Total
Balance as of January 1, 2020	$	(52,924)	$	7,780	$	(45,144)
Other comprehensive (loss) income	(20,469)		8,306		(12,163)
Balance as of June 30, 2020	$	(73,393)	$	16,086	$	(57,307)

There were no amounts reclassified from accumulated other comprehensive loss to net income for the six months ended June 30, 2020.

Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Incremental Costs to Obtain a Contract with a Customer


	June 30, 2020		December 31, 2019
Deferred costs included in prepaid and other current assets	$	43,220	$	45,009
Deferred costs included in other assets	19,816		25,698
Total deferred costs	$	63,036	$	70,707

Revenue from Contracts with Customers


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
U.S.	$	443,668	$	416,859	$	872,598	$	835,059
International	351,047		288,215		686,419		576,523
Total revenue	$	794,715	$	705,074	$	1,559,017	$	1,411,582


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Web Division	$	404,342	$	377,558	$	810,337	$	751,760
Media and Carrier Division	390,373		327,516		748,680		659,822
Total revenue	$	794,715	$	705,074	$	1,559,017	$	1,411,582

- Definition

+ References

+ Details

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's effective income tax rate is based on estimated income for the year, the estimated composition of the income in different jurisdictions and discrete adjustments, if any, in the applicable quarterly periods. Potential discrete adjustments include tax charges or benefits related to stock-based compensation, changes in tax legislation, settlements of tax audits or assessments, uncertain tax positions and acquisitions, among other items. In the second quarter of 2018, the Company filed an appeal with the Massachusetts Appellate Tax Board (“MATB”) contesting adverse audit findings related to certain tax benefits and exemptions. In July 2020, the MATB ruled in the Company’s favor; however, the decision is eligible for appeal by the Massachusetts Department of Revenue. The Company has determined that it is more-likely-than-not that it will ultimately prevail in the event of any such appeal. Accordingly, no reserve has been recorded related to these controversies. The Company has, however, estimated that an adverse ruling could result in a gross income tax charge of approximately $37.0 million, which may be partially offset by certain state tax credits of $27.0 million, which are not currently benefited as a result of the Company's valuation allowance assessment. The Company’s effective income tax rate was 10.3% and 16.5% for the six months ended June 30, 2020 and 2019, respectively. The lower effective tax rate for the six months ended June 30, 2020, is primarily due to an increase in foreign income taxed at lower rates, an increase in the excess tax benefit related to stock-based compensation, a decrease in intercompany sales of intellectual property and a decrease in the valuation allowance recorded against deferred tax assets related to state tax credits. These amounts were partially offset by a decrease in the benefit of U.S. federal, state and foreign research and development credits. For the six months ended June 30, 2020, the effective income tax rate was lower than the federal statutory tax rate due to foreign income taxed at lower rates, the excess tax benefit related to stock-based compensation and the benefit of U.S. federal, state and foreign research and development credits. These amounts were partially offset by the valuation allowance recorded against deferred tax assets related to state tax credits, non-deductible stock-based compensation and state taxes. For the six months ended June 30, 2019, the effective income tax rate was lower than the federal statutory tax rate due to foreign income taxed at lower rates, the excess tax benefit related to stock-based compensation and the benefit of U.S. federal, state and foreign research and development credits. These amounts were partially offset by the valuation allowance recorded against deferred tax assets related to state tax credits, non-deductible executive compensation, state taxes and an intercompany sale of intellectual property. In response to the novel coronavirus, or COVID-19, pandemic, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted on March 27, 2020. The CARES Act did not have a material impact on the effective tax rate for the period ended June 30, 2020. The Company will continue to monitor further changes to the global legislative and regulatory developments enacted as a result of COVID-19.

- 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

Net Income per Share

6 Months Ended

Jun. 30, 2020

Earnings Per Share Reconciliation [Abstract]

Net Income per Share

Net Income per ShareBasic 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, restricted stock units ("RSUs"), deferred stock units ("DSUs"), convertible senior notes and warrants issued by the Company. The dilutive effect of outstanding awards and convertible securities is reflected in diluted earnings per share by application of the treasury stock method.

The following table sets forth the components used in the computation of basic and diluted net income per share for the three and six months ended June 30, 2020 and 2019 (in thousands, except per share data):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net income	$	161,915	$	113,915	$	285,061	$	221,045
Denominator:
Shares used for basic net income per share	162,413		163,407		162,203		163,322
Effect of dilutive securities:
Stock options	62		92		37		71
RSUs and DSUs	1,640		1,520		1,659		1,510
Convertible senior notes	653		—		327		—
Warrants related to issuance of convertible senior notes	—		—		—		—
Shares used for diluted net income per share	164,768		165,019		164,226		164,903
Basic net income per share	$	1.00	$	0.70	$	1.76	$	1.35
Diluted net income per share	$	0.98	$	0.69	$	1.74	$	1.34

For the three and six months ended June 30, 2020 and 2019, certain potential outstanding common shares issuable in respect of stock options, service-based RSUs, convertible notes and warrants were excluded from the computation of diluted net income per share because the effect of including these items was 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 common shares excluded from the computation of diluted net income per share for the three and six months ended June 30, 2020 and 2019 are as follows (in thousands):


	For the Three Months Ended June 30,			For the Six Months Ended June 30,
	2020	2019	2020	2019

Service-based RSUs	115	174	1,069	1,370
Market-and performance-based RSUs	1,383	1,484	1,435	1,484
Convertible senior notes	9,898	12,093	15,945	12,093
Warrants related to issuance of convertible senior notes	21,991	12,093	21,991	12,093
Total shares excluded from computation	33,387	25,844	40,440	27,040

Nature of Business and Basis of Presentation (Policies)	6 Months Ended
Nature of Business and Basis of Presentation (Policies)	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting	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 the Company 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 in, or omitted from, 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 the Company’s annual report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission on February 28, 2020. 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, consisting only of normal recurring adjustments, that are necessary for a fair statement of the results of all interim periods reported herein.
Newly-Adopted Accounting Pronouncements	Newly-Adopted Accounting Pronouncements In June 2016, the Financial Accounting Standards Board ("FASB") issued guidance that introduces a new methodology for accounting for credit losses on financial instruments. The guidance establishes a new "expected credit loss model" that requires entities to estimate current expected credit losses on financial instruments by using all practical and relevant information. Any expected credit losses are to be reflected as allowances. The Company prospectively adopted this standard on January 1, 2020. Adoption of the standard did not have a material impact on the Company's consolidated financial statements. In August 2018, the FASB issued guidance that addresses a customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The guidance aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance for capitalizing costs associated with developing or obtaining internal-use software. The Company prospectively adopted this standard on January 1, 2020. Adoption of the standard did not have a material impact on the Company's consolidated financial statements. Recent Accounting Pronouncements In August 2020, the FASB issued guidance that is expected to reduce complexity and improve comparability of financial reporting associated with accounting for convertible instruments and contracts in an entity’s own equity. This guidance will be effective for the Company on January 1, 2022. The Company is evaluating the potential impact of adopting this new accounting guidance on its consolidated financial statements.

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Schedule of Marketable Securities

The following is a summary of available-for-sale marketable securities held as of June 30, 2020 and December 31, 2019 (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, 2020

Commercial paper	$	26,897	$	77	$	(1)	$	26,973	$	26,973	$	—
Corporate bonds	1,399,255		12,877		(339)		1,411,793		692,231		719,562
U.S. government agency obligations	362,188		866		(47)		363,007		80,851		282,156
	$	1,788,340	$	13,820	$	(387)	$	1,801,773	$	800,055	$	1,001,718

As of December 31, 2019
Certificates of deposit	$	150,000	$	—	$	—	$	150,000	$	150,000	$	—
Commercial paper	73,829		23		(7)		73,845		73,845		—
Corporate bonds	1,368,668		1,840		(378)		1,370,130		753,538		616,592
U.S. government agency obligations	369,475		80		(74)		369,481		165,623		203,858
	$	1,961,972	$	1,943	$	(459)	$	1,963,456	$	1,143,006	$	820,450

Schedule of Fair Value Measurement

The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets as of June 30, 2020 and December 31, 2019 (in thousands):


	Total Fair Value		Fair Value Measurements at Reporting Date Using
					Level 1			Level 2
As of June 30, 2020
Money market funds	$	104,131	$	104,131		$	—

Commercial paper	26,973		—			26,973
Corporate bonds	1,411,793		—			1,411,793
U.S. government agency obligations	363,007		—			363,007
Mutual funds	17,383		17,383			—
	$	1,923,287	$	121,514		$	1,801,773




As of December 31, 2019
Money market funds	$	50,779	$	50,779		$	—
Certificates of deposit	150,000		—			150,000
Commercial paper	73,845		—			73,845
Corporate bonds	1,370,130		—			1,370,130
U.S. government agency obligations	369,481		—			369,481
Mutual funds	15,177		15,177			—
	$	2,029,412	$	65,956		$	1,963,456

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

Contractual maturities of the Company’s available-for-sale marketable securities held as of June 30, 2020 and December 31, 2019 were as follows (in thousands):


	June 30, 2020		December 31, 2019
Due in 1 year or less	$	800,055	$	1,143,006
Due after 1 year through 3 years	1,001,718		820,450
	$	1,801,773	$	1,963,456

Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2020

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

Schedule of Accounts Receivable

Net accounts receivable consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Trade accounts receivable	$	482,451	$	396,204
Unbilled accounts receivable	168,433		157,619
Gross accounts receivable	650,884		553,823
Allowances for current expected credit losses and other reserves	(6,225)		(1,880)
Accounts receivable, net	$	644,659	$	551,943

Summary of Allowance for Credit Loss Activity

The following table summarizes the activity of the Company's allowance for current expected credit losses and other reserves during the six months ended June 30, 2020 (in thousands):


Balance as of January 1, 2020	$	1,880
Charges to income from operations	7,523
Collections from customers previously reserved and other	(3,178)
Balance as of June 30, 2020	$	6,225

Incremental Costs to Obtain a Contract with a Customer (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of deferred costs associated with obtaining customer contracts


	June 30, 2020		December 31, 2019
Deferred costs included in prepaid and other current assets	$	43,220	$	45,009
Deferred costs included in other assets	19,816		25,698
Total deferred costs	$	63,036	$	70,707

Goodwill and Acquired Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The change in the carrying amount of goodwill for the six months ended June 30, 2020 was as follows (in thousands):


Balance as of January 1, 2020	$	1,600,265

Measurement period adjustments related to acquisitions completed in prior years	(1,056)
Foreign currency translation	(3,905)
Balance as of June 30, 2020	$	1,595,304

Schedule of Acquired Intangible Assets

Acquired intangible assets that are subject to amortization consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020										December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Completed technology	$	154,170	$	(102,539)	$	51,631	$	153,722	$	(94,088)	$	59,634
Customer-related intangible assets	315,465		(174,845)		140,620		279,684		(163,155)		116,529
Non-compete agreements	819		(657)		162		830		(529)		301
Trademarks and trade names	7,548		(5,010)		2,538		7,600		(4,633)		2,967
Acquired license rights	490		(490)		—		490		(490)		—
Total	$	478,492	$	(283,541)	$	194,951	$	442,326	$	(262,895)	$	179,431

Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The 2027 Notes consisted of the following components as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Liability component:
Principal	$	1,150,000	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(209,737)		(222,928)
Net carrying amount	$	940,263	$	927,072

Equity component:	$	220,529	$	220,529

The 2025 Notes consisted of the following components as of June 30, 2020 and December 31, 2019 (in thousands):


	June 30, 2020		December 31, 2019
Liability component:
Principal	$	1,150,000	$	1,150,000
Less: debt discount and issuance costs, net of amortization	(217,326)		(237,281)
Net carrying amount	$	932,674	$	912,719

Equity component:	$	285,225	$	285,225

Schedule of Interest Expense

The following table sets forth total interest expense included in the consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Amortization of debt discount and issuance costs	$	16,709	$	9,666	$	33,264	$	22,675
Coupon interest payable on 2025 Notes	359		359		718		718
Coupon interest payable on 2027 Notes	1,078		—		2,156		—
Revolving credit facility contractual interest expense	135		77		270		216
Capitalization of interest expense	(1,032)		(1,656)		(1,954)		(3,047)
Total interest expense	$	17,249	$	8,446	$	34,454	$	20,562

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 235
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 2
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Restructuring (Tables)

6 Months Ended

Jun. 30, 2020

Restructuring and Related Activities [Abstract]

Summary of Restructuring Accrual Activity

The following table summarizes the activity of the Company's restructuring accrual during the six months ended June 30, 2020 (in thousands):


	Employee Severance and Related Benefits		Software Charges		Other		Total
Balance as of January 1, 2020	$	5,707	$	99	$	151	$	5,957
Costs incurred	4,168		—		49		4,217
Cash disbursements	(9,398)		(99)		(175)		(9,672)
Non-cash charges	—		—		(11)		(11)

Balance as of June 30, 2020	$	477	$	—	$	14	$	491

Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Stockholders' Equity Note [Abstract]

Schedule of Stock-Based Compensation Expense

The following table summarizes stock-based compensation included in the Company’s consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Cost of revenue	$	6,254	$	5,793	$	11,990	$	11,362
Research and development	11,549		12,044		23,614		24,101
Sales and marketing	16,011		15,740		31,746		30,791
General and administrative	15,377		14,565		29,334		27,193
Total stock-based compensation	49,191		48,142		96,684		93,447
Provision for income taxes	(16,823)		(13,798)		(29,459)		(26,791)
Total stock-based compensation, net of income taxes	$	32,368	$	34,344	$	67,225	$	66,656

Accumulated Other Comprehensive Loss (Tables)

6 Months Ended

Jun. 30, 2020

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

Schedule of Accumulated Other Comprehensive Income (Loss)


	Foreign Currency Translation		Net Unrealized Gains on Investments		Total
Balance as of January 1, 2020	$	(52,924)	$	7,780	$	(45,144)
Other comprehensive (loss) income	(20,469)		8,306		(12,163)
Balance as of June 30, 2020	$	(73,393)	$	16,086	$	(57,307)

Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes revenue by geography included in the Company’s consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
U.S.	$	443,668	$	416,859	$	872,598	$	835,059
International	351,047		288,215		686,419		576,523
Total revenue	$	794,715	$	705,074	$	1,559,017	$	1,411,582

The following table summarizes revenue by division included in the Company’s consolidated statements of income for the three and six months ended June 30, 2020 and 2019 (in thousands):


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Web Division	$	404,342	$	377,558	$	810,337	$	751,760
Media and Carrier Division	390,373		327,516		748,680		659,822
Total revenue	$	794,715	$	705,074	$	1,559,017	$	1,411,582

Net Income per Share (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share Reconciliation [Abstract]

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


	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net income	$	161,915	$	113,915	$	285,061	$	221,045
Denominator:
Shares used for basic net income per share	162,413		163,407		162,203		163,322
Effect of dilutive securities:
Stock options	62		92		37		71
RSUs and DSUs	1,640		1,520		1,659		1,510
Convertible senior notes	653		—		327		—
Warrants related to issuance of convertible senior notes	—		—		—		—
Shares used for diluted net income per share	164,768		165,019		164,226		164,903
Basic net income per share	$	1.00	$	0.70	$	1.76	$	1.35
Diluted net income per share	$	0.98	$	0.69	$	1.74	$	1.34

Schedule of Shares Excluded from Computation of Diluted Earnings Per Share

The number of potentially outstanding common shares excluded from the computation of diluted net income per share for the three and six months ended June 30, 2020 and 2019 are as follows (in thousands):


	For the Three Months Ended June 30,			For the Six Months Ended June 30,
	2020	2019	2020	2019

Service-based RSUs	115	174	1,069	1,370
Market-and performance-based RSUs	1,383	1,484	1,435	1,484
Convertible senior notes	9,898	12,093	15,945	12,093
Warrants related to issuance of convertible senior notes	21,991	12,093	21,991	12,093
Total shares excluded from computation	33,387	25,844	40,440	27,040

Nature of Business and Basis of Presentation (Details)	6 Months Ended
Nature of Business and Basis of Presentation (Details)	Jun. 30, 2020 server country segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of servers (more than) \| server	300,000
Number of countries in which servers are located (more than) \| country	130
Number of industry segments \| segment	1

Fair Value Measurements - Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 1,788,340	$ 1,961,972
Gross Unrealized Gains	13,820	1,943
Gross Unrealized Losses	(387)	(459)
Available-for-sale securities	1,801,773	1,963,456
Short-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	800,055	1,143,006
Long-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	1,001,718	820,450
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	26,897	73,829
Gross Unrealized Gains	77	23
Gross Unrealized Losses	(1)	(7)
Available-for-sale securities	26,973	73,845
Commercial paper \| Short-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	26,973	73,845
Commercial paper \| Long-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	0	0
Corporate bonds
Marketable Securities [Line Items]
Amortized Cost	1,399,255	1,368,668
Gross Unrealized Gains	12,877	1,840
Gross Unrealized Losses	(339)	(378)
Available-for-sale securities	1,411,793	1,370,130
Securities in an continuous unrealized loss position for twelve month or longer	1,600
Corporate bonds \| Short-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	692,231	753,538
Corporate bonds \| Long-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	719,562	616,592
U.S. government agency obligations
Marketable Securities [Line Items]
Amortized Cost	362,188	369,475
Gross Unrealized Gains	866	80
Gross Unrealized Losses	(47)	(74)
Available-for-sale securities	363,007	369,481
U.S. government agency obligations \| Short-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	80,851	165,623
U.S. government agency obligations \| Long-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities	$ 282,156	203,858
Certificates of deposit
Marketable Securities [Line Items]
Amortized Cost		150,000
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Available-for-sale securities		150,000
Certificates of deposit \| Short-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities		150,000
Certificates of deposit \| Long-Term Marketable Securities
Marketable Securities [Line Items]
Available-for-sale securities		$ 0

Fair Value Measurements - Schedule of Fair Value Measurement (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 1,801,773	$ 1,963,456
Cash equivalents and marketable securities	1,923,287	2,029,412
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	104,131	50,779
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26,973	73,845
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		150,000
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,411,793	1,370,130
U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	363,007	369,481
Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,383	15,177
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and marketable securities	121,514	65,956
Level 1 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	104,131	50,779
Level 1 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 1 \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		0
Level 1 \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 1 \| U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Level 1 \| Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	17,383	15,177
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents and marketable securities	1,801,773	1,963,456
Level 2 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Level 2 \| Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	26,973	73,845
Level 2 \| Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities		150,000
Level 2 \| Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	1,411,793	1,370,130
Level 2 \| U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	363,007	369,481
Level 2 \| Mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	$ 0

Fair Value Measurements - Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Due in 1 year or less	$ 800,055	$ 1,143,006
Due after 1 year through 3 years	1,001,718	820,450
Aggregate Fair Value	$ 1,801,773	$ 1,963,456

Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 650,884	$ 553,823
Allowances for current expected credit losses and other reserves	(6,225)	(1,880)
Accounts receivable, net	644,659	551,943
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	168,433	157,619
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 482,451	$ 396,204

Accounts Receivables - Allowance for Credit Losses (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of January 1, 2020	$ 1,880
Charges to income from operations	7,523
Collections from customers previously reserved and other	(3,178)
Balance as of June 30, 2020	$ 6,225

Incremental Costs to Obtain a Contract with a Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Commission and incentive payments
Capitalized Contract Cost [Line Items]
Total deferred costs	$ 63,036		$ 63,036		$ 70,707
Commission and incentive payments \| Deferred costs included in prepaid and other current assets
Capitalized Contract Cost [Line Items]
Total deferred costs	43,220		43,220		45,009
Commission and incentive payments \| Deferred costs included in other assets
Capitalized Contract Cost [Line Items]
Total deferred costs	19,816		19,816		$ 25,698
Deferred commissions
Capitalized Contract Cost [Line Items]
Amortization expense	$ 16,100	$ 10,800	$ 30,200	$ 21,600

Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Schedule of Goodwill [Roll Forward]
Balance as of January 1, 2020	$ 1,600,265
Measurement period adjustments related to acquisitions completed in prior years	(1,056)
Foreign currency translation	(3,905)
Balance as of June 30, 2020	$ 1,595,304

Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 478,492	$ 442,326
Accumulated Amortization	(283,541)	(262,895)
Net Carrying Amount	194,951	179,431
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	154,170	153,722
Accumulated Amortization	(102,539)	(94,088)
Net Carrying Amount	51,631	59,634
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	315,465	279,684
Accumulated Amortization	(174,845)	(163,155)
Net Carrying Amount	140,620	116,529
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	819	830
Accumulated Amortization	(657)	(529)
Net Carrying Amount	162	301
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,548	7,600
Accumulated Amortization	(5,010)	(4,633)
Net Carrying Amount	2,538	2,967
Acquired license rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	490	490
Accumulated Amortization	(490)	(490)
Net Carrying Amount	$ 0	$ 0

Goodwill and Acquired Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 10,381	$ 9,648	$ 20,815	$ 19,247
Future amortization expense to be recognized in remainder of 2020	21,100		21,100
Future amortization expense 2021	43,000		43,000
Future amortization expense 2022	37,300		37,300
Future amortization expense 2023	28,900		28,900
Future amortization expense 2024	$ 20,500		$ 20,500

Acquisitions - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Jun. 30, 2020	Jun. 30, 2019
Asset Acquisition [Line Items]
Cash paid for asset acquisition		$ 36,376	$ 0
Instart
Asset Acquisition [Line Items]
Cash paid for asset acquisition	$ 36,400
Instart \| Customer-related intangible assets
Asset Acquisition [Line Items]
Useful life of intangible asset	17 years

Debt - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	Aug. 31, 2019 USD ($) d $ / shares shares	May 31, 2018 USD ($) d $ / shares shares	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Feb. 28, 2014 USD ($)
Debt Instrument [Line Items]
Repurchases of common stock			$ 27,300,000	$ 107,880,000	$ 116,247,000
Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 500,000,000.0
Debt term		5 years
Maximum borrowing capacity under specific conditions		$ 1,000,000,000.0
Outstanding borrowings			0	$ 0
Credit Agreement \| Minimum
Debt Instrument [Line Items]
Commitment fee				0.075%
Credit Agreement \| Minimum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				0.00%
Credit Agreement \| Minimum \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				0.875%
Credit Agreement \| Maximum
Debt Instrument [Line Items]
Commitment fee				0.15%
Credit Agreement \| Maximum \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				0.25%
Credit Agreement \| Maximum \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.25%
2027 Notes \| Convertible Debt
Debt Instrument [Line Items]
Debt issued	$ 1,150,000,000.0		1,150,000,000	$ 1,150,000,000		$ 1,150,000,000
Interest rate	0.375%
Threshold trading days exceeding price \| d	20
Threshold consecutive trading days exceeding price \| d	30
Threshold greater than percentage of stock price trigger	130.00%
Threshold trading days not exceeding price	5 days
Conversion rate	0.0086073
Principal amount per conversion	$ 1,000
Conversion price (in dollars per share) \| $ / shares	$ 116.18
Potential conversion shares of convertible debt (in shares) \| shares	9.9
Fair value of convertible senior notes			$ 1,251,800,000	$ 1,251,800,000		1,133,800,000
Closing price of common stock (in dollars per share) \| $ / shares			$ 107.09	$ 107.09
Repurchases of common stock	$ 100,000,000.0
Payments for purchase of convertible note hedge and warrant transactions	127,100,000
Payments for note hedge transactions	$ 312,200,000
Warrants outstanding (in shares) \| shares	9.9
Warrant strike price (in dollars per share) \| $ / shares	$ 178.74
Proceeds from sale of warrants	$ 185,200,000
Threshold less than percentage of stock price trigger	98.00%
Effective interest rate			3.10%	3.10%
2025 Notes \| Convertible Debt
Debt Instrument [Line Items]
Debt issued		$ 1,150,000,000.0	$ 1,150,000,000	$ 1,150,000,000		1,150,000,000
Interest rate		0.125%
Threshold trading days exceeding price \| d		20
Threshold consecutive trading days exceeding price \| d		30
Threshold greater than percentage of stock price trigger		130.00%
Threshold trading days not exceeding price		5 days
Conversion rate		0.010515
Principal amount per conversion		$ 1,000
Conversion price (in dollars per share) \| $ / shares		$ 95.10
Potential conversion shares of convertible debt (in shares) \| shares		12.1
Fair value of convertible senior notes			$ 1,427,200,000	$ 1,427,200,000		$ 1,270,700,000
Closing price of common stock (in dollars per share) \| $ / shares			$ 107.09	$ 107.09
Repurchases of common stock		$ 46,200,000
Payments for purchase of convertible note hedge and warrant transactions		141,800,000
Payments for note hedge transactions		$ 261,700,000
Warrants outstanding (in shares) \| shares		12.1
Warrant strike price (in dollars per share) \| $ / shares		$ 149.18
Proceeds from sale of warrants		$ 119,900,000
Threshold consecutive trading days not exceeding price		5 days
Threshold less than percentage of stock price trigger		98.00%
Effective interest rate			4.26%	4.26%
2019 Notes \| Convertible Debt
Debt Instrument [Line Items]
Debt issued							$ 690,000,000.0
Effective interest rate			3.20%	3.20%

Debt - Schedule of Convertible Senior Notes (Details) - Convertible Debt - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Aug. 31, 2019	May 31, 2018
2027 Notes
Liability component:
Principal	$ 1,150,000,000	$ 1,150,000,000	$ 1,150,000,000.0
Less: debt discount and issuance costs, net of amortization	(209,737,000)	(222,928,000)
Net carrying amount	940,263,000	927,072,000
Equity component:	220,529,000	220,529,000
2025 Notes
Liability component:
Principal	1,150,000,000	1,150,000,000		$ 1,150,000,000.0
Less: debt discount and issuance costs, net of amortization	(217,326,000)	(237,281,000)
Net carrying amount	932,674,000	912,719,000
Equity component:	$ 285,225,000	$ 285,225,000

Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs	$ 16,709	$ 9,666	$ 33,264	$ 22,675
Capitalization of interest expense	(1,032)	(1,656)	(1,954)	(3,047)
Total interest expense	17,249	8,446	34,454	20,562
Credit Agreement
Debt Instrument [Line Items]
Interest on debt instruments	135	77	270	216
Convertible Debt \| 2025 Notes
Debt Instrument [Line Items]
Interest on debt instruments	359	359	718	718
Convertible Debt \| 2027 Notes
Debt Instrument [Line Items]
Interest on debt instruments	$ 1,078	$ 0	$ 2,156	$ 0

Restructuring (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
Restructuring (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred	$ (167,000)	$ 790,000	$ 10,418,000	$ 7,179,000
Impairment on right-of-use asset			6,200,000
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			5,957,000
Costs incurred			4,217,000
Cash disbursements			(9,672,000)
Non-cash charges			(11,000)
Balance as of June 30, 2020	491,000		491,000		$ 491,000
2019 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred			10,400,000		20,600,000
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred		$ 800,000	0	$ 7,000,000.0	19,000,000.0
Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			5,707,000
Costs incurred			4,168,000
Cash disbursements			(9,398,000)
Non-cash charges			0
Balance as of June 30, 2020	477,000		477,000		477,000
Software Charges
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			99,000
Costs incurred			0
Cash disbursements			(99,000)
Non-cash charges			0
Balance as of June 30, 2020	0		0		0
Other
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			151,000
Costs incurred			49,000
Cash disbursements			(175,000)
Non-cash charges			(11,000)
Balance as of June 30, 2020	$ 14,000		$ 14,000		$ 14,000

Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Nov. 30, 2018
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 1,100,000,000
Repurchases of common stock	$ 27,300,000		$ 107,880,000	$ 116,247,000
Amortization expense from capitalized stock-based compensation	$ 7,200,000	$ 7,300,000	$ 14,800,000	$ 15,400,000
Common Stock
Class of Stock [Line Items]
Shares repurchased during period (in shares)	0.3		1.1

Stockholders' Equity - Schedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 49,191	$ 48,142	$ 96,684	$ 93,447
Provision for income taxes	(16,823)	(13,798)	(29,459)	(26,791)
Total stock-based compensation, net of income taxes	32,368	34,344	67,225	66,656
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	6,254	5,793	11,990	11,362
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	11,549	12,044	23,614	24,101
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	16,011	15,740	31,746	30,791
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 15,377	$ 14,565	$ 29,334	$ 27,193

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 3,672,218	$ 3,283,217	$ 3,657,958	$ 3,191,860
Other comprehensive (loss) income	21,688	4,495	(12,163)	6,428
Ending Balance	3,904,295	3,394,764	3,904,295	3,394,764
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(78,995)	(46,979)	(45,144)	(48,912)
Ending Balance	(57,307)	$ (42,484)	(57,307)	$ (42,484)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(52,924)
Other comprehensive (loss) income			(20,469)
Ending Balance	(73,393)		(73,393)
Net Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			7,780
Other comprehensive (loss) income			8,306
Ending Balance	$ 16,086		$ 16,086

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) division	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) division	Jun. 30, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Revenue	$ 794,715	$ 705,074	$ 1,559,017	$ 1,411,582
Number of divisions \| division	2		2
Web Division
Disaggregation of Revenue [Line Items]
Revenue	$ 404,342	377,558	$ 810,337	751,760
Media and Carrier Division
Disaggregation of Revenue [Line Items]
Revenue	390,373	327,516	748,680	659,822
U.S.
Disaggregation of Revenue [Line Items]
Revenue	443,668	416,859	872,598	835,059
International
Disaggregation of Revenue [Line Items]
Revenue	$ 351,047	$ 288,215	$ 686,419	$ 576,523

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

+ Details

Revenue from Contracts with Customers - Performance Obligation (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 59.7	$ 52.8
Remaining performance obligation	$ 2,500.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, percentage	70.00%
Remaining performance obligation, expected timing	12 months

Income Taxes - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Estimated income tax charge	$ 37.0
Tax credit	$ 27.0
Effective income tax rate	10.30%	16.50%

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 161,915	$ 113,915	$ 285,061	$ 221,045
Denominator:
Shares used for basic net income per share (in shares)	162,413	163,407	162,203	163,322
Effect of dilutive securities:
Stock options (in shares)	62	92	37	71
RSUs and DSUs (in shares)	1,640	1,520	1,659	1,510
Convertible senior notes (in shares)	653	0	327	0
Warrants related to issuance of convertible senior notes (in shares)	0	0	0	0
Shares used for diluted net income per share (in shares)	164,768	165,019	164,226	164,903
Basic net income per share (in dollars per share)	$ 1.00	$ 0.70	$ 1.76	$ 1.35
Diluted net income per share (in dollars per share)	$ 0.98	$ 0.69	$ 1.74	$ 1.34

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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	33,387	25,844	40,440	27,040
Service-based RSUs (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	115	174	1,069	1,370
Market-and performance-based RSUs (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	1,383	1,484	1,435	1,484
Convertible senior notes (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	9,898	12,093	15,945	12,093
Warrants related to issuance of convertible senior notes (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	21,991	12,093	21,991	12,093