Akamai (AKAM) 10-Q 9 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 04, 2015
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Entity Registrant Name	AKAMAI TECHNOLOGIES INC
Entity Central Index Key	1,086,222
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		177,938,953

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 256,471	$ 238,650
Marketable securities	411,382	519,642
Accounts receivable, net of reserves of $9,007 and $9,023 at September 30, 2015, and December 31, 2014, respectively	365,957	329,578
Prepaid expenses and other current assets	115,601	128,981
Deferred income tax assets	61,574	45,704
Total current assets	1,210,985	1,262,555
Property and equipment, net	734,540	601,591
Marketable securities	837,020	869,992
Goodwill	1,135,500	1,051,294
Acquired intangible assets, net	158,978	132,412
Deferred income tax assets	1,888	1,955
Other assets	105,898	81,747
Total assets	4,184,809	4,001,546
Current liabilities:
Accounts payable	60,902	77,412
Accrued expenses	215,290	204,686
Deferred revenue	55,580	49,679
Other current liabilities	234	2,234
Total current liabilities	332,006	334,011
Deferred revenue	4,516	3,829
Deferred income tax liabilities	49,925	39,299
Convertible senior notes	619,365	604,851
Other liabilities	93,334	74,221
Total liabilities	$ 1,099,146	$ 1,056,211
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; 181,081,173 shares issued and 178,233,604 shares outstanding at September 30, 2015, and 178,300,603 shares issued and outstanding at December 31, 2014	1,811	1,783
Additional paid-in capital	4,685,078	4,559,430
Accumulated other comprehensive loss	(33,519)	(17,611)
Treasury stock, at cost, 2,847,569 shares at September 30, 2015, and no shares at December 31, 2014	(202,426)	0
Accumulated deficit	(1,365,281)	(1,598,267)
Total stockholders’ equity	3,085,663	2,945,335
Total liabilities and stockholders’ equity	$ 4,184,809	$ 4,001,546

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Accounts receivable reserve (in dollars)	$ 9,007	$ 9,023
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares designated as Series A Junior Participating Preferred Stock	700,000	700,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	700,000,000	700,000,000
Common stock, shares issued	181,081,173	178,300,603
Common stock, shares outstanding	178,233,604	178,300,603
Treasury stock, shares	2,847,569	0

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 551,030	$ 498,042	$ 1,618,289	$ 1,427,579
Costs and operating expenses:
Cost of revenue (exclusive of amortization of acquired intangible assets shown below)	183,204	158,812	532,408	447,742
Research and development	38,396	32,583	110,917	92,869
Sales and marketing	107,426	96,215	322,406	268,742
General and administrative	99,543	81,905	288,287	239,946
Amortization of acquired intangible assets	6,752	8,403	20,284	23,654
Restructuring charges (benefits)	20	(115)	517	1,189
Total costs and operating expenses	435,341	377,803	1,274,819	1,074,142
Income from operations	115,689	120,239	343,470	353,437
Interest income	2,723	2,010	8,265	5,389
Interest expense	(4,630)	(4,482)	(13,884)	(10,939)
Other income (expense), net	204	(188)	(1,702)	(1,968)
Income before provision for income taxes	113,986	117,579	336,149	345,919
Provision for income taxes	25,946	26,424	103,163	109,078
Net income	$ 88,040	$ 91,155	$ 232,986	$ 236,841
Net income per share:
Basic (in dollars per share)	$ 0.49	$ 0.51	$ 1.30	$ 1.33
Diluted (in dollars per share)	$ 0.49	$ 0.50	$ 1.29	$ 1.31
Shares used in per share calculations:
Basic (in shares)	178,547	178,186	178,591	178,324
Diluted (in shares)	180,364	180,955	180,642	181,278

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 88,040	$ 91,155	$ 232,986	$ 236,841
Other comprehensive loss:
Foreign currency translation adjustments	(9,261)	(10,763)	(17,069)	(7,937)
Change in unrealized gain (loss) on investments, net of income tax (provision) benefit of $(73), $715, $(647) and $324 for the three and nine months ended September 30, 2015 and 2014, respectively	121	(1,279)	1,161	483
Other comprehensive loss	(9,140)	(12,042)	(15,908)	(7,454)
Comprehensive income	$ 78,900	$ 79,113	$ 217,078	$ 229,387

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
(Provision) benefit on change in unrealized gain (loss) on investments, net	$ (73)	$ (647)	$ 715	$ 324

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 232,986	$ 236,841
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	219,234	179,643
Stock-based compensation	92,966	84,800
Excess tax benefits from stock-based compensation	(24,851)	(23,958)
(Benefit) provision for deferred income taxes	(17,941)	10,622
Amortization of debt discount and issuance costs	13,884	10,939
Other non-cash reconciling items, net	3,271	2,535
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(40,707)	(50,213)
Prepaid expenses and other current assets	16,119	(22,346)
Accounts payable and accrued expenses	26,098	36,876
Deferred revenue	6,908	7,688
Other current liabilities	146	(703)
Other non-current assets and liabilities	18,247	(10,195)
Net cash provided by operating activities	546,360	462,529
Cash flows from investing activities:
Cash paid for acquired businesses, net of cash acquired	(122,445)	(386,532)
Purchases of property and equipment	(262,404)	(142,466)
Capitalization of internal-use software development costs	(103,742)	(83,841)
Purchases of short- and long-term marketable securities	(584,189)	(1,068,198)
Proceeds from sales of short- and long-term marketable securities	2,008	354,313
Proceeds from maturities of short- and long-term marketable securities	725,117	277,109
Other non-current assets and liabilities	(3,037)	7,222
Net cash used in investing activities	(348,692)	(1,042,393)
Cash flows from financing activities:
Proceeds from the issuance of convertible senior notes, net of issuance costs	0	678,735
Proceeds from the issuance of warrants related to convertible senior notes	0	77,970
Purchase of note hedge related to convertible senior notes	0	(101,292)
Repayment of acquired debt and capital leases	0	(17,862)
Proceeds related to the issuance of common stock under stock plans	54,288	75,361
Excess tax benefits from stock-based compensation	24,851	23,958
Employee taxes paid related to net share settlement of stock-based awards	(47,171)	(43,205)
Repurchases of common stock	(202,426)	(226,513)
Other non-current assets and liabilities	(2,050)	(1,575)
Net cash (used in) provided by financing activities	(172,508)	465,577
Effects of exchange rate changes on cash and cash equivalents	(7,339)	(5,265)
Net increase (decrease) in cash and cash equivalents	17,821	(119,552)
Cash and cash equivalents at beginning of period	238,650	333,891
Cash and cash equivalents at end of period	256,471	214,339
Supplemental disclosure of cash flow information:
Cash paid for income taxes, net of refunds received in the nine months ended September 30, 2015 of $19,285	47,045	117,723
Non-cash investing and financing activities:
Purchases of property and equipment and capitalization of internal-use software development costs included in accounts payable and accrued expenses	27,026	40,131
Capitalization of stock-based compensation	$ 13,133	$ 11,577

Consolidated Statements of Cas8

Consolidated Statements of Cash Flows (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Income tax refund received	$ 19,285

Nature of Business and Basis of

Nature of Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2015
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 cloud services for delivering, optimizing and securing online content and business applications. The Company's globally-distributed platform comprises approximately 200,000 servers in over 1,400 networks in more than 115 countries. The Company was incorporated in Delaware in 1998 and is headquartered in Cambridge, Massachusetts. The Company currently operates in one industry segment: providing services for delivering, optimizing and securing online 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, 2014 , filed with the Securities and Exchange Commission on March 2, 2015. 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. Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued updated guidance and disclosure requirements for recognizing revenue. The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized. The core principle is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. This standard will be effective for the Company on January 1, 2018, and may be applied retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption. The Company is evaluating the potential impact of adopting this new accounting guidance. In April 2015, the FASB issued updated guidance that will change the current presentation of debt issuance costs on the balance sheet. This new guidance will move debt issuance costs from the assets section of the balance sheet to the liabilities section as a direct deduction from the carrying amount of the debt issued. The guidance will be effective for the Company on January 1, 2016. The Company will reclassify its debt issuance costs included in other assets on the consolidated balance sheet to convertible senior notes within the liabilities and stockholders' equity section. The amount of deferred financing costs expected to be reclassified as of January 1, 2016 is $6.2 million . This revision will have no impact on the Company's results of operations or cash flows. In September 2015, the FASB issued updated guidance that eliminates the requirement to restate prior period financial statements for measurement period adjustments. In an effort to reduce complexity in financial reporting, the new guidance requires that the cumulative impact of a measurement period adjustment, including the impact on prior periods, be recognized in the reporting period in which the adjustment is identified. The standard will be effective for the Company on January 1, 2016. The Company does not expect this guidance to have a material impact on its results of operations, financial condition or cash flows.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following is a summary of available-for-sale marketable securities held as of September 30, 2015 and December 31, 2014 (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 September 30, 2015 Corporate bonds $ 1,017,036 $ 668 $ (1,179 ) $ 1,016,525 $ 392,335 $ 624,190 U.S. government agency obligations 230,598 257 (25 ) 230,830 19,047 211,783 $ 1,247,634 $ 925 $ (1,204 ) $ 1,247,355 $ 411,382 $ 835,973 As of December 31, 2014 Certificates of deposit $ 39 $ — $ — $ 39 $ — $ 39 Commercial paper 10,487 — (2 ) 10,485 10,485 — Corporate bonds 1,077,387 454 (2,132 ) 1,075,709 424,777 650,932 U.S. government agency obligations 303,808 20 (427 ) 303,401 84,380 219,021 $ 1,391,721 $ 474 $ (2,561 ) $ 1,389,634 $ 519,642 $ 869,992 During the first quarter of 2015, the Company began offering certain qualified individuals 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 statements of income. As of September 30, 2015, the Company held for investment corporate bonds with a fair value of $68.8 million , which are classified as available-for-sale marketable securities and have been in a continuous unrealized loss position for more than 12 months. The unrealized losses are not significant and are attributable to changes in interest rates. The Company does not believe any unrealized losses represent other than temporary impairments based on the evaluation of available evidence. At December 31, 2014 , there were no securities in a continuous unrealized loss position for more than 12 months. The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liabilities at September 30, 2015 and December 31, 2014 (in thousands): Total Fair Value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 As of September 30, 2015 Cash Equivalents and Marketable Securities: Money market funds $ 1,805 $ 1,805 $ — $ — Corporate bonds 1,016,525 — 1,016,525 — U.S. government agency obligations 230,830 — 230,830 — Mutual funds 1,047 1,047 — — $ 1,250,207 $ 2,852 $ 1,247,355 $ — As of December 31, 2014 Cash Equivalents and Marketable Securities: Money market funds $ 501 $ 501 $ — $ — Certificates of deposit 39 39 — — Commercial paper 10,485 — 10,485 — Corporate bonds 1,075,709 — 1,075,709 — U.S. government agency obligations 303,401 — 303,401 — $ 1,390,135 $ 540 $ 1,389,595 $ — Other Liabilities: Contingent consideration obligation related to Velocius acquisition $ (900 ) $ — $ — $ (900 ) As of September 30, 2015 and December 31, 2014 , the Company grouped money market funds, certificates of deposit and mutual funds using a Level 1 valuation because market prices for such investments were readily available in active markets. As of September 30, 2015 and December 31, 2014 , the Company grouped commercial paper, corporate bonds and U.S. government agency obligations using a Level 2 valuation because quoted prices for identical or similar assets were available in markets that are inactive. 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 use primarily 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. The valuation technique used to measure fair value of the Company's Level 3 liability, which consisted of a contingent consideration related to the acquisition of Velocius Networks, Inc. ("Velocius") in 2013, was primarily an income approach. The significant unobservable input used in the fair value measurement of the Velocius contingent consideration was the likelihood of achieving development milestones to integrate the acquired technology into the Company's technology. The remaining milestone was achieved in June 2015 and was paid in the third quarter of 2015. The following table reflects the activity for the Company’s liability measured at fair value using Level 3 inputs for the nine months ended September 30, 2015 (in thousands): September 30, 2015 Balance as of January 1, 2015 $ (900 ) Fair value adjustment to contingent consideration included in general and administrative expense (100 ) Achievement of final milestone related to Velocius contingent consideration 1,000 Balance as of September 30, 2015 $ — Contractual maturities of the Company’s available-for-sale marketable securities held at September 30, 2015 and December 31, 2014 were as follows (in thousands): September 30, December 31, Due in 1 year or less $ 411,382 $ 519,642 Due after 1 year through 5 years 835,973 869,992 $ 1,247,355 $ 1,389,634

Accounts Receivable

Accounts Receivable	9 Months Ended
	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Accounts Receivable	Accounts Receivable Net accounts receivable consisted of the following as of September 30, 2015 and December 31, 2014 (in thousands): September 30, December 31, Trade accounts receivable $ 251,911 $ 222,531 Unbilled accounts receivable 123,053 116,070 Gross accounts receivable 374,964 338,601 Allowance for doubtful accounts (641 ) (1,033 ) Reserve for cash-basis customers (8,366 ) (7,990 ) Total accounts receivable reserves (9,007 ) (9,023 ) Accounts receivable, net $ 365,957 $ 329,578

Goodwill and Acquired Intangibl

Goodwill and Acquired Intangible Assets	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Acquired Intangible Assets	Goodwill and Acquired Intangible Assets The change in the carrying amount of goodwill for the nine months ended September 30, 2015 was as follows (in thousands): Balance as of January 1, 2015 $ 1,051,294 Acquisition of Xerocole, Inc. 12,859 Acquisition of Codemate A/S 69,445 Foreign currency translation 1,902 Balance as of September 30, 2015 $ 1,135,500 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 September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Accumulated Net Completed technology $ 116,891 $ (55,330 ) $ 61,561 $ 88,331 $ (45,537 ) $ 42,794 Customer-related intangible assets 191,710 (99,933 ) 91,777 173,600 (91,160 ) 82,440 Non-compete agreements 6,870 (3,328 ) 3,542 8,890 (4,224 ) 4,666 Trademarks and trade names 3,700 (1,602 ) 2,098 3,700 (1,188 ) 2,512 Acquired license rights 490 (490 ) — 490 (490 ) — Total $ 319,661 $ (160,683 ) $ 158,978 $ 275,011 $ (142,599 ) $ 132,412 Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2015 was $6.8 million and $20.3 million , respectively. Aggregate expense related to amortization of acquired intangible assets for the three and nine months ended September 30, 2014 was $8.4 million and $23.7 million , respectively. Based on the Company’s acquired intangible assets as of September 30, 2015 , aggregate expense related to amortization of acquired intangible assets is expected to be $6.8 million for the remainder of 2015 , and $26.4 million , $27.6 million , $23.3 million and $21.0 million for 2016 , 2017 , 2018 and 2019 , respectively.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Business Acquisitions	Business Acquisitions The Company acquired Xerocole, Inc. ("Xerocole") in February 2015 and Codemate A/S and its wholly-owned subsidiary Octoshape ApS (together, "Octoshape") in April 2015. The consolidated financial statements include the operating results of each business from the date of acquisition. Pro forma results of operations for these acquisitions have not been presented because the effects of the acquisitions, individually and in the aggregate, were not material to the Company's consolidated financial results. Revenue and earnings of the acquired companies since the date of the acquisitions that are included in the Company's consolidated statements of income are also not presented separately because they are not material. The total amount of acquisition-related costs were $1.1 million for the nine months ended September 30, 2015 and are included in general and administrative expense in the consolidated statements of income. Xerocole On February 27, 2015, the Company acquired Xerocole, a provider of recursive Domain Name System ("DNS") functionality, for $16.6 million in cash. The Company acquired Xerocole with a goal of expanding its existing Authoritative DNS products. The Company allocated $12.9 million of the cost of the acquisition to goodwill and $4.9 million to acquired intangibles, which have a weighted average useful life of 8.8 years. The allocation of the purchase price has been finalized. Octoshape On April 6, 2015, the Company acquired all of the outstanding capital stock of Octoshape in exchange for $ 107.0 million in cash. Octoshape is a cloud service provider focused on delivering broadcast, enterprise and carrier solutions. The goal of acquiring Octoshape is to make available for customers additional delivery and optimization technologies for video streams of over-the-top (also known as OTT) content and to enable the Company to more fully support Internet Protocol television (also known as IPTV) solutions. The allocation of the purchase price has been finalized, with the exception of evaluating certain accounts receivable, current liabilities and tax-related assets and liabilities. The Company is in the process of gathering the facts and circumstances existing as of the acquisition date in order to finalize the valuation of these items. The following table presents the preliminary allocation of the purchase price for Octoshape (in thousands): Total purchase consideration $ 107,047 Allocation of the purchase consideration: Cash $ 664 Accounts receivable 1,976 Other current assets 393 Identifiable intangible assets 41,950 Goodwill 69,445 Deferred tax assets 5,230 Total assets acquired 119,658 Other current liabilities (1,983 ) Current deferred revenue (770 ) Deferred tax liabilities (9,858 ) Total liabilities assumed (12,611 ) Net assets acquired $ 107,047 The value of the goodwill can be attributed to a number of business factors, including a trained technical and sales workforce and cost synergies expected to be realized. The total amount of goodwill related to the acquisition of Octoshape expected to be deducted for tax purposes is $69.4 million . The following were the identified intangible assets acquired and their respective weighted average useful lives (in thousands, except years): Gross Carrying Amount Weighted Average Useful Life (in years) Completed technologies $ 25,310 9.8 Customer-related intangible assets 16,560 11.8 Non-compete agreements 80 2.0 Total $ 41,950 Bloxx On October 30, 2015, the Company acquired Bloxx Limited ("Bloxx"), a provider of Secure Web Gateway ("SWG") technology, for $18.7 million in cash. The allocation of the purchase price has not been finalized as of the date of the filing of these financial statements. The acquisition is expected to provide us with technology to complement the Company's cloud security strategy for protecting businesses against Internet vulnerabilities. Pro forma results of operations for the acquisition of Bloxx have not been presented because the effects are not material to the Company's consolidated financial statements.

Convertible Senior Notes

Convertible Senior Notes	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes In February 2014, the Company issued $690.0 million in par value of convertible senior notes due 2019 (the "Notes"). The Notes are senior unsecured obligations of the Company, do not bear regular interest and mature on February 15, 2019 , unless repurchased or converted prior to maturity. At their option, holders may convert their Notes prior to the close of business on the business day immediately preceding August 15, 2018 only under the following circumstances: • during any calendar quarter commencing after the calendar quarter ended June 30, 2014 (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 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; or • during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of 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 August 15, 2018 , holders may convert all or any portion of their 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 11.1651 shares of the Company's common stock per $1,000 principal amount, which is equivalent to an initial conversion price of approximately $89.56 per share, subject to adjustments in certain events, and represents a potential conversion into 7.7 million shares. In accounting for the issuance of the Notes, the Company separated the 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 Notes. The difference between the principal amount of the 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 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 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 Notes, and transaction costs attributable to the equity component are netted against the equity component of the Notes in stockholders’ equity. The Notes consist of the following components (in thousands): September 30, 2015 December 31, 2014 Liability component: Principal $ 690,000 $ 690,000 Less: debt discount, net of amortization (70,635 ) (85,149 ) Net carrying amount $ 619,365 $ 604,851 Equity component: $ 101,276 $ 101,276 The estimated fair value of the Company's Notes at September 30, 2015 was $724.3 million . The fair value was determined based on data points other than quoted prices that are observable, either directly or indirectly, and has been classified as Level 2 within the fair value hierarchy. Based on the closing price of the Company's common stock of $69.06 on September 30, 2015 , the value of the Notes if converted to common stock was less than the principal amount of $690.0 million . The Company used $62.0 million of the proceeds from the offering to repurchase shares of its common stock, concurrently with the issuance of the Notes. The repurchases were made in accordance with the share repurchase program previously approved by the Board of Directors (Note 8). Additionally, $23.3 million of the proceeds was used for the net cost of convertible note hedge and warrant transactions. The Company intends to use the remaining net proceeds for working capital and other general corporate purposes, as well as for potential additional acquisitions and strategic transactions. Note Hedge To minimize the impact of potential dilution upon conversion of the Notes, the Company entered into convertible note hedge transactions with respect to its common stock in February 2014. The Company paid $101.3 million for the note hedge transactions. The note hedge transactions cover approximately 7.7 million shares of the Company’s common stock at a strike price that corresponds to the initial conversion price of the Notes, also subject to adjustment, and are exercisable upon conversion of the Notes. The note hedge transactions are intended to reduce dilution in the event of conversion of the Notes. Warrants Separately, in February 2014, the Company entered into warrant transactions, whereby the Company sold warrants to acquire, subject to anti-dilution adjustments, up to 7.7 million shares of the Company’s common stock at a strike price of approximately $104.49 per share. The Company received aggregate proceeds of $78.0 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 Notes to approximately $104.49 per share. Interest Expense The Notes do not bear regular interest, but have an effective interest rate of 3.2% attributable to the conversion feature. The following table sets forth total interest expense included in the statements of income related to the Notes (in thousands): For the Three Months For the Nine Months 2015 2014 2015 2014 Amortization of debt discount $ 463 $ 449 $ 1,377 $ 1,079 Amortization of debt issuance costs 4,881 4,712 14,515 11,373 Capitalization of interest expense (714 ) (679 ) (2,008 ) (1,513 ) Total interest expense $ 4,630 $ 4,482 $ 13,884 $ 10,939

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Company is conducting an internal investigation, with the assistance of outside counsel, relating to sales practices in a country outside the U.S. that represented less than 1% of the Company’s revenue during the three and nine months ended September 30, 2015 , and in each of the years ended December 31, 2014, 2013 and 2012. The internal investigation includes a review of compliance with the requirements of the U.S. Foreign Corrupt Practices Act and other applicable laws and regulations by employees in that market. In February 2015, the Company voluntarily contacted the U.S. Securities and Exchange Commission and Department of Justice to advise both agencies of this internal investigation. The Company is cooperating with those agencies. As of the filing of these financial statements, the Company cannot predict the outcome of this matter. No provision with respect to this matter has been made in the Company's consolidated financial statements.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2015
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity Share Repurchase Program In October 2013, the Board of Directors authorized a $750.0 million share repurchase program, effective from October 16, 2013 through December 31, 2016. During the nine months ended September 30, 2015 , the Company repurchased 2.8 million shares of its common stock for $202.4 million . Stock-Based Compensation The following table summarizes stock-based compensation included in the Company’s consolidated statements of income for the three and nine months ended September 30, 2015 and 2014 (in thousands): For the Three Months For the Nine Months 2015 2014 2015 2014 Cost of revenue $ 3,579 $ 3,030 $ 10,244 $ 8,901 Research and development 5,982 4,979 17,357 14,517 Sales and marketing 13,465 12,110 39,295 35,438 General and administrative 8,020 7,889 26,070 25,944 Total stock-based compensation 31,046 28,008 92,966 84,800 Provision for income taxes (11,218 ) (8,472 ) (33,325 ) (26,852 ) Total stock-based compensation, net of income taxes $ 19,828 $ 19,536 $ 59,641 $ 57,948 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 nine months ended September 30, 2015 include stock-based compensation reflected as a component of amortization of capitalized internal-use software of $2.9 million and $9.3 million , respectively, before income taxes. For the three and nine months ended September 30, 2014 , the Company's consolidated statements of income include stock-based compensation reflected as a component of amortization of capitalized internal-use software of $3.6 million and $7.5 million , respectively, before income taxes.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders' equity, for the nine months ended September 30, 2015 (in thousands): Foreign Currency Translation Adjustments Net Unrealized Gain on Investments Total Balance as of January 1, 2015 $ (22,064 ) $ 4,453 $ (17,611 ) Other comprehensive (loss) income (17,069 ) 1,161 (15,908 ) Balance as of September 30, 2015 $ (39,133 ) $ 5,614 $ (33,519 ) The tax effect on accumulated unrealized gain on investments was insignificant as of September 30, 2015 and December 31, 2014 . Amounts reclassified from accumulated other comprehensive loss to net income were insignificant for the nine months ended September 30, 2015 .

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective income tax rate was 30.7% and 31.5% for the nine months ended September 30, 2015 and 2014 , respectively. The 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, including retroactive changes in tax legislation, settlements of tax audits or assessments, the resolution or identification of tax position uncertainties and acquisitions of other companies. For the nine months ended September 30, 2015 , the effective income tax rate was lower than the federal statutory tax rate due to the retroactive application of a U.S. tax court ruling with respect to the treatment of stock-based compensation in intercompany arrangements, the domestic production activities deduction and the composition of income from foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the U.S., partially offset by the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income taxes. For the nine months ended September 30, 2014 , the effective income tax rate was lower than the federal statutory tax rate mainly due to the benefit from the state software development activities and income from foreign jurisdictions that is taxed at lower rates compared to the statutory tax rates in the U.S.; partially offset by the effects of accounting for stock-based compensation in accordance with the authoritative guidance for share-based payments and state income taxes.

Net Income per Share

Net Income per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share Reconciliation [Abstract]
Net Income per Share	Net Income per Share Basic net income per share is computed using the weighted average number of common shares outstanding during the applicable period. Diluted net income per share is computed using the weighted average number of common shares outstanding during the period, plus the dilutive effect of potential common stock. Potential common stock consists of shares issuable pursuant to stock options, restricted stock units (“RSUs”), deferred stock units, 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 nine months ended September 30, 2015 and 2014 (in thousands, except per share data): For the Three Months For the Nine Months 2015 2014 2015 2014 Numerator: Net income $ 88,040 $ 91,155 $ 232,986 $ 236,841 Denominator: Shares used for basic net income per share 178,547 178,186 178,591 178,324 Effect of dilutive securities: Stock options 667 1,146 858 1,257 RSUs and deferred stock units 1,150 1,623 1,193 1,697 Convertible senior notes — — — — Warrants related to issuance of convertible senior notes — — — — Shares used for diluted net income per share 180,364 180,955 180,642 181,278 Basic net income per share $ 0.49 $ 0.51 $ 1.30 $ 1.33 Diluted net income per share $ 0.49 $ 0.50 $ 1.29 $ 1.31 For the three and nine months ended September 30, 2015 and 2014 , certain potential outstanding shares from 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 potential outstanding shares excluded from the computation of diluted net income per share for the three and nine months ended September 30, 2015 and 2014 are as follows (in thousands): For the Three Months For the Nine Months 2015 2014 2015 2014 Stock options 3 261 10 462 Service-based RSUs 157 797 269 773 Performance-based RSUs 1,148 565 1,148 572 Convertible senior notes 7,704 7,704 7,704 7,704 Warrants related to issuance of convertible senior notes 7,704 7,704 7,704 7,704 The calculation of assumed proceeds used to determine the diluted weighted average shares outstanding under the treasury stock method in the periods presented was adjusted by tax windfalls and shortfalls associated with all of the Company’s outstanding stock awards. Such windfalls and shortfalls are computed by comparing the tax deductible amount of outstanding stock awards to their grant date fair values and multiplying the results by the applicable statutory tax rate. A positive result creates a windfall, which increases the assumed proceeds, and a negative result creates a shortfall, which reduces the assumed proceeds.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Schedule of Marketable Securities	The following is a summary of available-for-sale marketable securities held as of September 30, 2015 and December 31, 2014 (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 September 30, 2015 Corporate bonds $ 1,017,036 $ 668 $ (1,179 ) $ 1,016,525 $ 392,335 $ 624,190 U.S. government agency obligations 230,598 257 (25 ) 230,830 19,047 211,783 $ 1,247,634 $ 925 $ (1,204 ) $ 1,247,355 $ 411,382 $ 835,973 As of December 31, 2014 Certificates of deposit $ 39 $ — $ — $ 39 $ — $ 39 Commercial paper 10,487 — (2 ) 10,485 10,485 — Corporate bonds 1,077,387 454 (2,132 ) 1,075,709 424,777 650,932 U.S. government agency obligations 303,808 20 (427 ) 303,401 84,380 219,021 $ 1,391,721 $ 474 $ (2,561 ) $ 1,389,634 $ 519,642 $ 869,992
Schedule of Fair Value Measurement	The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liabilities at September 30, 2015 and December 31, 2014 (in thousands): Total Fair Value Fair Value Measurements at Reporting Date Using Level 1 Level 2 Level 3 As of September 30, 2015 Cash Equivalents and Marketable Securities: Money market funds $ 1,805 $ 1,805 $ — $ — Corporate bonds 1,016,525 — 1,016,525 — U.S. government agency obligations 230,830 — 230,830 — Mutual funds 1,047 1,047 — — $ 1,250,207 $ 2,852 $ 1,247,355 $ — As of December 31, 2014 Cash Equivalents and Marketable Securities: Money market funds $ 501 $ 501 $ — $ — Certificates of deposit 39 39 — — Commercial paper 10,485 — 10,485 — Corporate bonds 1,075,709 — 1,075,709 — U.S. government agency obligations 303,401 — 303,401 — $ 1,390,135 $ 540 $ 1,389,595 $ — Other Liabilities: Contingent consideration obligation related to Velocius acquisition $ (900 ) $ — $ — $ (900 )
Schedule of Liability Measured at Fair Value using Level 3 Inputs	The following table reflects the activity for the Company’s liability measured at fair value using Level 3 inputs for the nine months ended September 30, 2015 (in thousands): September 30, 2015 Balance as of January 1, 2015 $ (900 ) Fair value adjustment to contingent consideration included in general and administrative expense (100 ) Achievement of final milestone related to Velocius contingent consideration 1,000 Balance as of September 30, 2015 $ —
Schedule of Contractual Maturities of Marketable Securities and Other Investment Related Assets	Contractual maturities of the Company’s available-for-sale marketable securities held at September 30, 2015 and December 31, 2014 were as follows (in thousands): September 30, December 31, Due in 1 year or less $ 411,382 $ 519,642 Due after 1 year through 5 years 835,973 869,992 $ 1,247,355 $ 1,389,634

Accounts Receivable (Tables)

Accounts Receivable (Tables)	9 Months Ended
	Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of Accounts Receivable	Net accounts receivable consisted of the following as of September 30, 2015 and December 31, 2014 (in thousands): September 30, December 31, Trade accounts receivable $ 251,911 $ 222,531 Unbilled accounts receivable 123,053 116,070 Gross accounts receivable 374,964 338,601 Allowance for doubtful accounts (641 ) (1,033 ) Reserve for cash-basis customers (8,366 ) (7,990 ) Total accounts receivable reserves (9,007 ) (9,023 ) Accounts receivable, net $ 365,957 $ 329,578

Goodwill and Acquired Intangi22

Goodwill and Acquired Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The change in the carrying amount of goodwill for the nine months ended September 30, 2015 was as follows (in thousands): Balance as of January 1, 2015 $ 1,051,294 Acquisition of Xerocole, Inc. 12,859 Acquisition of Codemate A/S 69,445 Foreign currency translation 1,902 Balance as of September 30, 2015 $ 1,135,500
Schedule of Acquired Intangible Assets	Acquired intangible assets that are subject to amortization consisted of the following as of September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Accumulated Net Completed technology $ 116,891 $ (55,330 ) $ 61,561 $ 88,331 $ (45,537 ) $ 42,794 Customer-related intangible assets 191,710 (99,933 ) 91,777 173,600 (91,160 ) 82,440 Non-compete agreements 6,870 (3,328 ) 3,542 8,890 (4,224 ) 4,666 Trademarks and trade names 3,700 (1,602 ) 2,098 3,700 (1,188 ) 2,512 Acquired license rights 490 (490 ) — 490 (490 ) — Total $ 319,661 $ (160,683 ) $ 158,978 $ 275,011 $ (142,599 ) $ 132,412

Business Acquisitions (Tables)

Business Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2015
Business Acquisition [Line Items]
Schedule of Acquired Intangible Assets	Acquired intangible assets that are subject to amortization consisted of the following as of September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Accumulated Net Completed technology $ 116,891 $ (55,330 ) $ 61,561 $ 88,331 $ (45,537 ) $ 42,794 Customer-related intangible assets 191,710 (99,933 ) 91,777 173,600 (91,160 ) 82,440 Non-compete agreements 6,870 (3,328 ) 3,542 8,890 (4,224 ) 4,666 Trademarks and trade names 3,700 (1,602 ) 2,098 3,700 (1,188 ) 2,512 Acquired license rights 490 (490 ) — 490 (490 ) — Total $ 319,661 $ (160,683 ) $ 158,978 $ 275,011 $ (142,599 ) $ 132,412
Octoshape [Member]
Business Acquisition [Line Items]
Schedule of Preliminary Allocation of the Purchase Price	The following table presents the preliminary allocation of the purchase price for Octoshape (in thousands): Total purchase consideration $ 107,047 Allocation of the purchase consideration: Cash $ 664 Accounts receivable 1,976 Other current assets 393 Identifiable intangible assets 41,950 Goodwill 69,445 Deferred tax assets 5,230 Total assets acquired 119,658 Other current liabilities (1,983 ) Current deferred revenue (770 ) Deferred tax liabilities (9,858 ) Total liabilities assumed (12,611 ) Net assets acquired $ 107,047
Schedule of Acquired Intangible Assets	The following were the identified intangible assets acquired and their respective weighted average useful lives (in thousands, except years): Gross Carrying Amount Weighted Average Useful Life (in years) Completed technologies $ 25,310 9.8 Customer-related intangible assets 16,560 11.8 Non-compete agreements 80 2.0 Total $ 41,950

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Schedule of Convertible Senior Notes	The Notes consist of the following components (in thousands): September 30, 2015 December 31, 2014 Liability component: Principal $ 690,000 $ 690,000 Less: debt discount, net of amortization (70,635 ) (85,149 ) Net carrying amount $ 619,365 $ 604,851 Equity component: $ 101,276 $ 101,276
Schedule of Interest Expense	The following table sets forth total interest expense included in the statements of income related to the Notes (in thousands): For the Three Months For the Nine Months 2015 2014 2015 2014 Amortization of debt discount $ 463 $ 449 $ 1,377 $ 1,079 Amortization of debt issuance costs 4,881 4,712 14,515 11,373 Capitalization of interest expense (714 ) (679 ) (2,008 ) (1,513 ) Total interest expense $ 4,630 $ 4,482 $ 13,884 $ 10,939

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2015
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 nine months ended September 30, 2015 and 2014 (in thousands): For the Three Months For the Nine Months 2015 2014 2015 2014 Cost of revenue $ 3,579 $ 3,030 $ 10,244 $ 8,901 Research and development 5,982 4,979 17,357 14,517 Sales and marketing 13,465 12,110 39,295 35,438 General and administrative 8,020 7,889 26,070 25,944 Total stock-based compensation 31,046 28,008 92,966 84,800 Provision for income taxes (11,218 ) (8,472 ) (33,325 ) (26,852 ) Total stock-based compensation, net of income taxes $ 19,828 $ 19,536 $ 59,641 $ 57,948

Accumulated Other Comprehensi26

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders' equity, for the nine months ended September 30, 2015 (in thousands): Foreign Currency Translation Adjustments Net Unrealized Gain on Investments Total Balance as of January 1, 2015 $ (22,064 ) $ 4,453 $ (17,611 ) Other comprehensive (loss) income (17,069 ) 1,161 (15,908 ) Balance as of September 30, 2015 $ (39,133 ) $ 5,614 $ (33,519 )

Net Income per Share (Tables)

Net Income per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share Reconciliation [Abstract]
Schedule of Components Used in Diluted and Basic Income Per Common Share	The following table sets forth the components used in the computation of basic and diluted net income per share for the three and nine months ended September 30, 2015 and 2014 (in thousands, except per share data): For the Three Months For the Nine Months 2015 2014 2015 2014 Numerator: Net income $ 88,040 $ 91,155 $ 232,986 $ 236,841 Denominator: Shares used for basic net income per share 178,547 178,186 178,591 178,324 Effect of dilutive securities: Stock options 667 1,146 858 1,257 RSUs and deferred stock units 1,150 1,623 1,193 1,697 Convertible senior notes — — — — Warrants related to issuance of convertible senior notes — — — — Shares used for diluted net income per share 180,364 180,955 180,642 181,278 Basic net income per share $ 0.49 $ 0.51 $ 1.30 $ 1.33 Diluted net income per share $ 0.49 $ 0.50 $ 1.29 $ 1.31
Schedule of Shares Excluded from Computation of Diluted Earnings Per Share	The number of potential outstanding shares excluded from the computation of diluted net income per share for the three and nine months ended September 30, 2015 and 2014 are as follows (in thousands): For the Three Months For the Nine Months 2015 2014 2015 2014 Stock options 3 261 10 462 Service-based RSUs 157 797 269 773 Performance-based RSUs 1,148 565 1,148 572 Convertible senior notes 7,704 7,704 7,704 7,704 Warrants related to issuance of convertible senior notes 7,704 7,704 7,704 7,704

Nature of Business and Basis 28

Nature of Business and Basis of Presentation - Narrative (Details) server in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)networksegmentcountryserver
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of servers (approximately 200,000) | server	200
Number of networks (over 1,400) | network	1,400
Number of countries servers are in (more than 115)	115
Number of industry segments | segment	1
Deferred financing costs expected to be reclassified | $	$ 6.2

Fair Value Measurements - Marke

Fair Value Measurements - Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,247,634	$ 1,391,721
Gross Unrealized Gains	925	474
Gross Unrealized Losses	(1,204)	(2,561)
Aggregate Fair Value	1,247,355	1,389,634
Short-Term Marketable Securities	411,382	519,642
Long-Term Marketable Securities	835,973	869,992
Available-for-sale marketable securities, continuous unrealized loss position for more than 12 months	68,800	0
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		39
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Aggregate Fair Value		39
Short-Term Marketable Securities		0
Long-Term Marketable Securities		39
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		10,487
Gross Unrealized Gains		0
Gross Unrealized Losses		(2)
Aggregate Fair Value		10,485
Short-Term Marketable Securities		10,485
Long-Term Marketable Securities		0
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,017,036	1,077,387
Gross Unrealized Gains	668	454
Gross Unrealized Losses	(1,179)	(2,132)
Aggregate Fair Value	1,016,525	1,075,709
Short-Term Marketable Securities	392,335	424,777
Long-Term Marketable Securities	624,190	650,932
U.S. government agency obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	230,598	303,808
Gross Unrealized Gains	257	20
Gross Unrealized Losses	(25)	(427)
Aggregate Fair Value	230,830	303,401
Short-Term Marketable Securities	19,047	84,380
Long-Term Marketable Securities	$ 211,783	$ 219,021

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value Measurement (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	$ 1,247,355	$ 1,389,634
Certificates of deposit
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		39
Commercial paper
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		10,485
Corporate bonds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	1,016,525	1,075,709
U.S. government agency obligations
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	230,830	303,401
Level 1
Cash Equivalents and Marketable Securities:
Cash equivalents and marketable securities	2,852	540
Other Liabilities:
Contingent consideration obligation related to Velocius acquisition		0
Level 1 | Money market funds
Cash Equivalents and Marketable Securities:
Money market funds	1,805	501
Level 1 | Certificates of deposit
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		39
Level 1 | Commercial paper
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		0
Level 1 | Corporate bonds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	0	0
Level 1 | U.S. government agency obligations
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	0	0
Level 1 | Mutual funds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	1,047
Level 2
Cash Equivalents and Marketable Securities:
Cash equivalents and marketable securities	1,247,355	1,389,595
Other Liabilities:
Contingent consideration obligation related to Velocius acquisition		0
Level 2 | Money market funds
Cash Equivalents and Marketable Securities:
Money market funds	0	0
Level 2 | Certificates of deposit
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		0
Level 2 | Commercial paper
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		10,485
Level 2 | Corporate bonds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	1,016,525	1,075,709
Level 2 | U.S. government agency obligations
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	230,830	303,401
Level 2 | Mutual funds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	0
Level 3
Cash Equivalents and Marketable Securities:
Cash equivalents and marketable securities	0	0
Other Liabilities:
Contingent consideration obligation related to Velocius acquisition		(900)
Level 3 | Money market funds
Cash Equivalents and Marketable Securities:
Money market funds	0	0
Level 3 | Certificates of deposit
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		0
Level 3 | Commercial paper
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		0
Level 3 | Corporate bonds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	0	0
Level 3 | U.S. government agency obligations
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	0	0
Level 3 | Mutual funds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	0
Total Fair Value
Cash Equivalents and Marketable Securities:
Cash equivalents and marketable securities	1,250,207	1,390,135
Other Liabilities:
Contingent consideration obligation related to Velocius acquisition		(900)
Total Fair Value | Money market funds
Cash Equivalents and Marketable Securities:
Money market funds	1,805	501
Total Fair Value | Certificates of deposit
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		39
Total Fair Value | Commercial paper
Cash Equivalents and Marketable Securities:
Aggregate Fair Value		10,485
Total Fair Value | Corporate bonds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	1,016,525	1,075,709
Total Fair Value | U.S. government agency obligations
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	230,830	$ 303,401
Total Fair Value | Mutual funds
Cash Equivalents and Marketable Securities:
Aggregate Fair Value	$ 1,047

Fair Value Measurements - Sch31

Fair Value Measurements - Schedule of Liability Measured at Fair Value using Level 3 Inputs (Details) - Level 3 $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 1, 2015	$ (900)
Fair value adjustment to contingent consideration included in general and administrative expense	(100)
Achievement of final milestone related to Velocius contingent consideration	1,000
Balance as of September 30, 2015	$ 0

Fair Value Measurements - Contr

Fair Value Measurements - Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Due in 1 year or less	$ 411,382	$ 519,642
Due after 1 year through 5 years	835,973	869,992
Aggregate fair value	$ 1,247,355	$ 1,389,634

Accounts Receivable - Schedule

Accounts Receivable - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 374,964	$ 338,601
Allowance for doubtful accounts	(641)	(1,033)
Reserve for cash-basis customers	(8,366)	(7,990)
Total accounts receivable reserves	(9,007)	(9,023)
Accounts receivable, net	365,957	329,578
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	123,053	116,070
Trade accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 251,911	$ 222,531

Goodwill and Acquired Intangi34

Goodwill and Acquired Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Schedule of Goodwill [Roll Forward]
Balance as of January 1, 2015	$ 1,051,294
Foreign currency translation	1,902
Balance as of September 30, 2015	1,135,500
Xerocole, Inc. [Member]
Schedule of Goodwill [Roll Forward]
Acquisition of goodwill	12,859
Codemate A/S [Member]
Schedule of Goodwill [Roll Forward]
Acquisition of goodwill	$ 69,445

Goodwill and Acquired Intangi35

Goodwill and Acquired Intangible Assets - Schedule of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 319,661	$ 275,011
Accumulated Amortization	(160,683)	(142,599)
Net Carrying Amount	158,978	132,412
Completed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	116,891	88,331
Accumulated Amortization	(55,330)	(45,537)
Net Carrying Amount	61,561	42,794
Customer-related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	191,710	173,600
Accumulated Amortization	(99,933)	(91,160)
Net Carrying Amount	91,777	82,440
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,870	8,890
Accumulated Amortization	(3,328)	(4,224)
Net Carrying Amount	3,542	4,666
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,700	3,700
Accumulated Amortization	(1,602)	(1,188)
Net Carrying Amount	2,098	2,512
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 Intangi36

Goodwill and Acquired Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of acquired intangible assets	$ 6,752	$ 8,403	$ 20,284	$ 23,654
Future amortization expense to be recognized in remainder of 2015	6,800		6,800
Future amortization expense 2016	26,400		26,400
Future amortization expense 2017	27,600		27,600
Future amortization expense 2018	23,300		23,300
Future amortization expense 2019	$ 21,000		$ 21,000

Business Acquisitions - Narrati

Business Acquisitions - Narrative (Details) - USD ($) $ in Thousands	Oct. 30, 2015	Apr. 06, 2015	Feb. 27, 2015	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill				$ 1,135,500	$ 1,051,294
Xerocole, Codemate A/S and Octoshape [Member]
Business Acquisition [Line Items]
Acquisition-related costs				1,100
Xerocole, Inc. [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 16,600
Goodwill			12,900
Intangible assets acquired			$ 4,900
Weighted average useful life			8 years 9 months
Octoshape [Member]
Business Acquisition [Line Items]
Total purchase consideration		$ 107,047
Goodwill		$ 69,445
Intangible assets acquired				41,950
Goodwill expected to be tax deductible				$ 69,400
Bloxx [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 18,700

Business Acquisitions - Schedul

Business Acquisitions - Schedule of Preliminary Allocation of the Purchase Price (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Apr. 06, 2015	Dec. 31, 2014
Allocation of the purchase consideration:
Goodwill	$ 1,135,500		$ 1,051,294
Octoshape [Member]
Allocation of the purchase consideration:
Cash		$ 664
Accounts receivable		1,976
Other current assets		393
Identifiable intangible assets		41,950
Goodwill		69,445
Deferred tax assets		5,230
Total assets acquired		119,658
Other current liabilities		(1,983)
Current deferred revenue		(770)
Deferred tax liabilities		(9,858)
Total liabilities assumed		(12,611)
Net assets acquired		$ 107,047

Business Acquisitions - Sched39

Business Acquisitions - Schedule of Acquired Intangible Assets (Details) - Octoshape [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Business Acquisition [Line Items]
Gross carrying amount	$ 41,950
Completed technology
Business Acquisition [Line Items]
Gross carrying amount	$ 25,310
Weighted average useful life	9 years 9 months
Customer-related intangible assets
Business Acquisition [Line Items]
Gross carrying amount	$ 16,560
Weighted average useful life	11 years 9 months
Non-compete agreements
Business Acquisition [Line Items]
Gross carrying amount	$ 80
Weighted average useful life	2 years

Convertible Senior Notes - Narr

Convertible Senior Notes - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended	9 Months Ended
	Feb. 28, 2014USD ($)d$ / sharesshares	Sep. 30, 2015USD ($)$ / shares	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Debt issued	$ 690,000,000	$ 690,000,000		$ 690,000,000
Conversion rate (in shares)	11.1651
Principal amount per conversion	$ 1,000
Conversion price (in dollars per share) | $ / shares	$ 89.56
Threshold trading days exceeding price | d	20
Threshold consecutive trading days exceeding price	30 days
Threshold greater than percentage of stock price trigger	130.00%
Threshold trading days not exceeding price | d	5
Threshold consecutive trading days not exceeding price	5 days
Threshold less than percentage of stock price trigger	98.00%
Potential conversion shares of convertible debt (in shares) | shares	7.7
Fair value of convertible senior notes		$ 724,300,000
Closing price of common stock (in dollars per share) | $ / shares		$ 69.06
Repurchases of common stock	$ 62,000,000	$ 202,426,000	$ 226,513,000
Payments for purchase of convertible note hedge and warrant transactions	23,300,000
Payments for note hedge transactions	$ 101,300,000	0	101,292,000
Note hedge shares outstanding (in shares) | shares	7.7
Warrants outstanding (in shares) | shares	7.7
Warrant strike price (in dollars per share) | $ / shares	$ 104.49
Proceeds from sale of warrants	$ 78,000,000	$ 0	$ 77,970,000
Effective interest rate	3.20%

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of Convertible Senior Notes (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014	Feb. 28, 2014
Liability component:
Principal	$ 690,000,000	$ 690,000,000	$ 690,000,000
Less: debt discount, net of amortization	(70,635,000)	(85,149,000)
Net carrying amount	619,365,000	604,851,000
Convertible senior notes
Liability component:
Equity component:	$ 101,276,000	$ 101,276,000

Convertible Senior Notes - Sc42

Convertible Senior Notes - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Disclosure [Abstract]
Amortization of debt discount	$ 463	$ 449	$ 1,377	$ 1,079
Amortization of debt issuance costs	4,881	4,712	14,515	11,373
Capitalization of interest expense	(714)	(679)	(2,008)	(1,513)
Interest expense	$ 4,630	$ 4,482	$ 13,884	$ 10,939

Contingencies (Details)

Contingencies (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Percentage revenue representation for investigation of sales practices (less than 1%)	1.00%	1.00%	1.00%	1.00%	1.00%

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Oct. 31, 2013
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount						$ 750,000,000
Shares repurchased during period (in shares)				2.8
Repurchases of common stock	$ 62,000,000			$ 202,426,000	$ 226,513,000
Amortization expense from capitalized stock-based compensation		$ 2,900,000	$ 3,600,000	$ 9,300,000	$ 7,500,000

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 31,046	$ 28,008	$ 92,966	$ 84,800
Provision for income taxes	(11,218)	(8,472)	(33,325)	(26,852)
Total stock-based compensation, net of income taxes	19,828	19,536	59,641	57,948
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	3,579	3,030	10,244	8,901
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	5,982	4,979	17,357	14,517
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	13,465	12,110	39,295	35,438
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 8,020	$ 7,889	$ 26,070	$ 25,944

Accumulated Other Comprehensi46

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015			$ (17,611)
Other comprehensive (loss) income	$ (9,140)	$ (12,042)	(15,908)	$ (7,454)
Balance as of September 30, 2015	(33,519)		(33,519)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015			(22,064)
Other comprehensive (loss) income			(17,069)
Balance as of September 30, 2015	(39,133)		(39,133)
Net Unrealized Gain on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance as of January 1, 2015			4,453
Other comprehensive (loss) income			1,161
Balance as of September 30, 2015	$ 5,614		$ 5,614

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Effective income tax rate	30.70%	31.50%

Net Income per Share - Schedule

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		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator [Abstract]
Net income (in dollars)	$ 88,040	$ 91,155	$ 232,986	$ 236,841
Denominator [Abstract]
Shares used for basic net income per share	178,547	178,186	178,591	178,324
Effect of dilutive securities:
Convertible senior notes	0	0	0	0
Warrants related to issuance of convertible senior notes	0	0	0	0
Shares used for diluted net income per share	180,364	180,955	180,642	181,278
Basic net income per share (in dollars per share)	$ 0.49	$ 0.51	$ 1.30	$ 1.33
Diluted net income per share (in dollars per share)	$ 0.49	$ 0.50	$ 1.29	$ 1.31
Stock options
Effect of dilutive securities:
Dilutive securities	667	1,146	858	1,257
RSUs and deferred stock units
Effect of dilutive securities:
Dilutive securities	1,150	1,623	1,193	1,697

Net Income per Share - Schedu49

Net Income per Share - Schedule of Shares Excluded from Computation of Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	3	261	10	462
Service-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	157	797	269	773
Performance-based RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,148	565	1,148	572
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	7,704	7,704	7,704	7,704
Warrants related to issuance of convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	7,704	7,704	7,704	7,704