Citrix Systems (CTXS) 10-Q 30 Oct 20 2020 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Oct. 23, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	0-27084
Entity Registrant Name	CITRIX SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	75-2275152
Entity Address, Address Line One	851 West Cypress Creek Road
Entity Address, City or Town	Fort Lauderdale
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33309
City Area Code	954
Local Phone Number	267-3000
Title of 12(b) Security	Common Stock, par value $.001 per share
Trading Symbol	CTXS
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		123,123,572
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000877890
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 568,824	$ 545,761
Short-term investments, available-for-sale	355,957	43,055
Accounts receivable, net of allowances of $15,643 and $9,557 at September 30, 2020 and December 31, 2019, respectively	564,782	720,359
Inventories, net	15,887	15,898
Prepaid expenses and other current assets	233,514	187,659
Total current assets	1,738,964	1,512,732
Long-term investments, available-for-sale	13,591	16,640
Property and equipment, net	212,353	231,894
Operating lease right-of-use assets, net	187,530	206,154
Goodwill	1,798,408	1,798,408
Other intangible assets, net	87,124	108,478
Deferred tax assets, net	395,201	361,814
Other assets	175,423	152,806
Total assets	4,608,594	4,388,926
Current liabilities:
Accounts payable	101,339	84,538
Accrued expenses and other current liabilities	404,230	331,680
Income taxes payable	101,375	60,036
Current portion of deferred revenues	1,313,883	1,352,333
Total current liabilities	1,920,827	1,828,587
Long-term portion of deferred revenues	378,421	443,458
Long-term debt	1,732,069	742,926
Long-term income taxes payable	232,086	259,391
Operating lease liabilities	195,193	209,382
Other liabilities	81,198	67,526
Commitments and contingencies
Stockholders' equity:
Preferred stock at $.01 par value: 5,000 shares authorized, none issued and outstanding	0	0
Common stock at $.001 par value: 1,000,000 shares authorized; 321,557 and 318,760 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	322	319
Additional paid-in capital	6,527,362	6,249,065
Retained earnings	4,916,940	4,660,145
Accumulated other comprehensive loss	(4,327)	(5,127)
Stockholders' equity before treasury stock	11,440,297	10,904,402
Less - common stock in treasury, at cost (198,568 and 188,693 shares at September 30, 2020 and December 31, 2019, respectively)	(11,371,497)	(10,066,746)
Total stockholders' equity	68,800	837,656
Total liabilities and stockholders' equity	$ 4,608,594	$ 4,388,926

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 15,643	$ 9,557
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 issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	321,557,000	318,760,000
Common stock, shares outstanding	321,557,000	318,760,000
Common stock in treasury, shares	198,568,000	188,693,000

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues:
Revenue	$ 767,170	$ 732,901	$ 2,427,044	$ 2,200,741
Cost of net revenues:
Total cost of net revenues	127,286	126,918	365,103	344,870
Gross margin	639,884	605,983	2,061,941	1,855,871
Operating expenses:
Research and development	130,628	126,420	405,563	390,712
Sales, marketing and services	298,659	274,874	916,279	847,958
General and administrative	81,591	80,042	252,498	238,751
Amortization of other intangible assets	701	4,937	2,097	11,671
Restructuring Charges	0	8,879	11,981	16,022
Total operating expenses	511,579	495,152	1,588,418	1,505,114
Income from operations	128,305	110,831	473,523	350,757
Interest income	491	2,649	2,685	16,193
Interest expense	(16,639)	(8,822)	(48,326)	(37,144)
Other income, net	3,841	3,456	7,850	3,735
Income before income taxes	115,998	108,114	435,732	333,541
Income tax expense (benefit)	17,771	(162,743)	43,377	(141,159)
Net income	$ 98,227	$ 270,857	$ 392,355	$ 474,700
Earnings per share:
Basic (in dollars per share)	$ 0.80	$ 2.08	$ 3.17	$ 3.62
Diluted (in dollars per share)	$ 0.78	$ 2.04	$ 3.10	$ 3.48
Weighted average shares outstanding:
Basic (in shares)	123,255	130,277	123,835	131,020
Diluted (in shares)	125,863	132,655	126,407	136,297
Subscription [Member]
Revenues:
Revenue	$ 262,604	$ 159,873	$ 774,290	$ 457,312
Product and License [Member]
Revenues:
Revenue	87,218	131,057	390,009	406,733
Cost of net revenues:
Cost of net revenues	16,238	27,411	57,554	75,033
Support and Services [Member]
Revenues:
Revenue	417,348	441,971	1,262,745	1,336,696
Subscription, Support and Service [Member]
Cost of net revenues:
Cost of net revenues	102,755	76,885	282,672	227,130
Product [Member]
Cost of net revenues:
Amortization and impairment of product related intangible assets	$ 8,293	$ 22,622	$ 24,877	$ 42,707

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Unuaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 98,227	$ 270,857	$ 392,355	$ 474,700
Available for sale securities:
Change in net unrealized gains	14	57	145	2,859
Less: reclassification adjustment for net losses (gains) included in net income	1	7	(20)	(577)
Net change (net of tax effect)	15	64	125	2,282
Gain on pension liability	0	0	8	0
Cash flow hedges:
Change in unrealized gains (losses)	1,733	(1,774)	(394)	(1,439)
Less: reclassification adjustment for net losses (gains) included in net income	390	(162)	1,061	829
Net change (net of tax effect)	2,123	(1,936)	667	(610)
Other comprehensive income (loss)	2,138	(1,872)	800	1,672
Comprehensive income	$ 100,365	$ 268,985	$ 393,155	$ 476,372

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating Activities
Net income	$ 392,355	$ 474,700
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	159,283	188,443
Stock-based compensation expense	228,854	202,523
Deferred income tax benefit	(34,372)	(184,573)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	(9,225)	2,712
Other non-cash items	16,196	7,888
Total adjustments to reconcile net income to net cash provided by operating activities	360,736	216,993
Changes in operating assets and liabilities:
Accounts receivable	150,347	256,628
Inventories	(592)	443
Prepaid expenses and other current assets	(39,049)	(13,539)
Other assets	(67,139)	(50,068)
Income taxes, net	16,640	(42,119)
Accounts payable	17,973	(2,645)
Accrued expenses and other current liabilities	73,737	(48,485)
Deferred revenues	(103,487)	(219,000)
Other liabilities	14,252	4,111
Total changes in operating assets and liabilities	62,682	(114,674)
Net cash provided by operating activities	815,773	577,019
Investing Activities
Purchases of available-for-sale investments	(476,432)	(19,999)
Proceeds from sales of available-for-sale investments	0	938,031
Proceeds from maturities of available-for-sale investments	166,077	165,944
Purchases of property and equipment	(30,783)	(50,453)
Cash paid for licensing agreements, patents and technology	(5,581)	(2,405)
Other	923	919
Net cash (used in) provided by investing activities	(345,796)	1,032,037
Financing Activities
Proceeds from term loan credit agreement, net of issuance costs	998,846	0
Repayment of term loan credit agreement	(750,000)	0
Proceeds from 2030 Notes, net of issuance costs	738,107	0
Proceeds from credit facility	0	200,000
Repayment of credit facility	0	(200,000)
Repayment on convertible notes	0	(1,164,497)
Stock repurchases, net	(1,199,903)	(353,904)
Cash paid for tax withholding on vested stock awards	(104,848)	(74,794)
Cash paid for dividends	(129,108)	(137,224)
Net cash used in financing activities	(446,906)	(1,730,419)
Effect of exchange rate changes on cash and cash equivalents	(8)	(3,569)
Change in cash and cash equivalents	23,063	(124,932)
Cash and cash equivalents at beginning of period	545,761	618,766
Cash and cash equivalents at end of period	$ 568,824	$ 493,834

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying unaudited condensed consolidated financial statements of Citrix Systems, Inc. (the "Company") have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. All adjustments, which, in the opinion of management, are considered necessary for a fair presentation of the results of operations for the periods shown, are of a normal recurring nature and have been reflected in the condensed consolidated financial statements and accompanying notes. The results of operations for the periods presented are not necessarily indicative of the results expected for the full year or for any future period partially because of the seasonality of the Company’s business. Historically, the Company’s revenue for the fourth quarter of any year is typically higher than the revenue for the first quarter of the subsequent year. However, during the three months ended March 31, 2020, this trend was impacted by the novel coronavirus ("COVID-19") pandemic, and the Company's first quarter revenues were higher than the fourth quarter of 2019 due to the Company's decision to make limited use Workspace licenses of Citrix Workspace available in the form of shorter-duration, discounted on-premises term offerings to quickly help the Company's customers with their immediate business needs. The information included in these condensed consolidated financial statements should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in this report and the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019. The condensed consolidated financial statements of the Company include the accounts of its wholly-owned subsidiaries in the Americas; Europe, the Middle East and Africa (“EMEA”); and Asia-Pacific and Japan (“APJ”). All significant transactions and balances between the Company and its subsidiaries have been eliminated in consolidation.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIESDuring the first quarter of 2020, the Company adopted new accounting guidance related to current expected credit losses and fair value measurements, which are described below. There have been no other significant changes in the Company’s accounting policies during the nine months ended September 30, 2020 as compared to the significant accounting policies described in its Annual Report on Form 10-K for the year ended December 31, 2019. Recent Accounting Pronouncements Current Expected Credit Losses In June 2016, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update on the measurement of credit losses on financial instruments. Previously, credit losses were measured using an incurred loss approach when it was probable that a credit loss had been incurred. The new guidance changes the credit loss model from an incurred loss to an expected loss approach. It requires the application of a current expected credit loss (“CECL”) impairment model to financial assets measured at amortized cost (including trade accounts receivable) and certain off-balance-sheet credit exposures. Under the CECL model, lifetime expected credit losses on such financial assets are measured and recognized at each reporting date based on historical, current, and forecasted information. The standard also changes the impairment model for available-for-sale debt securities, eliminating the concept of other than temporary impairment and requiring credit losses to be recorded through an allowance for credit losses. The amount of the allowance for credit losses for available-for-sale debt securities is limited to the amount by which fair value is below amortized cost. The Company adopted this standard as of January 1, 2020 using the required modified retrospective adoption method. Results for periods beginning after January 1, 2020 are presented under the new guidance, while prior period amounts are not adjusted and continue to be reported under the previous accounting guidance. Adoption of the new standard did not have a material impact on the Company's condensed consolidated financial position, results of operations and cash flows. See Note 5 for additional information regarding the Company’s allowance for credit losses. Fair Value Measurements In August 2018, the FASB issued an accounting standard update on fair value measurements. The new guidance modifies the disclosure requirements on fair value measurements by removing certain disclosure requirements related to the fair value hierarchy, modifying existing disclosure requirements related to measurement uncertainty, and adding new disclosure requirements. The Company adopted this standard as of January 1, 2020, and it did not have a material impact on the Company's condensed consolidated financial position, results of operations and cash flows. Income Taxes In December 2019, the FASB issued an accounting standard update on income taxes. The new guidance eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. The new standard will be effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial position, results of operations and cash flows. Facilitation of the Effects of Reference Rate Reform on Financial Reporting In March 2020, the FASB issued an accounting standard update to guidance applicable to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. This update provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. An entity may elect to apply the amendments for contract modifications by topic or industry subtopic of the codification as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020, or prospectively from a date within an interim period that includes or is subsequent to March 12, 2020, up to the date that the financial statements are available to be issued. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial position, results of operations and cash flows. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Significant estimates made by management include estimation for reserves for legal contingencies, the standalone selling price related to revenue recognition, the provision for credit losses related to accounts receivable, contract assets, and available-for-sale debt securities, the provision to reduce obsolete or excess inventory to market, the provision for estimated returns, as well as sales allowances, the assumptions used in the valuation of stock-based awards and measurement of expense related to performance stock units, the assumptions used in the discounted cash flows to mark certain of its investments to market, the valuation of the Company’s goodwill, net realizable value of product related and other intangible assets, the provision for income taxes, valuation allowance for deferred tax assets, uncertain tax positions, and the amortization and depreciation periods for contract acquisition costs, intangible and long-lived assets. While the Company believes that such estimates are fair when considered in conjunction with the condensed consolidated financial position and results of operations taken as a whole, the actual amounts of such items, when known, will vary from these estimates. Available-for-sale Investments Short-term and long-term available-for-sale investments in debt securities as of September 30, 2020 and December 31, 2019 primarily consist of agency securities, corporate securities and government securities. Investments classified as available-for-sale debt securities are stated at fair value, with unrealized gains and losses, net of taxes, reported in Accumulated other comprehensive loss. The Company classifies its available-for-sale investments as current and non-current based on their actual remaining time to maturity. The Company does not recognize unrealized changes in the fair value of its available-for-sale debt securities in income unless a security is deemed to be impaired. The Company’s investment policy is designed to limit exposure to any one issuer depending on credit quality. The Company uses information provided by third parties to adjust the carrying value of certain of its investments to fair value at the end of each period. Fair values are based on a variety of inputs and may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes. See Note 6 for additional information regarding the Company’s investments. The functional currency for all of the Company’s wholly-owned foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities of such subsidiaries are remeasured into U.S. dollars at exchange rates in effect at the balance sheet date, and revenues and expenses are remeasured at average rates prevailing during the year. Accounting for Stock-Based Compensation Plans The Company has various stock-based compensation plans for its employees and outside directors and accounts for stock-based compensation arrangements in accordance with the authoritative guidance, which requires the Company to measure and record compensation expense in its condensed consolidated financial statements using a fair value method. See Note 8 for further information regarding the Company’s stock-based compensation plans.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE The following is a description of the principal activities from which the Company generates revenue. Subscription Subscription revenues primarily consist of cloud-hosted offerings, which provide customers a right to access one or more of the Company’s cloud-hosted subscription offerings, with routine customer support, as well as revenues from the Citrix Service Provider ("CSP") program and on-premise subscription software licenses. For the Company’s cloud-hosted performance obligations, revenue is generally recognized on a ratable basis over the contract term beginning on the date that the Company's service is made available to the customer, as the Company continuously provides online access to the web-based software that the customer can use at any time. The CSP program provides subscription-based services in which the CSP partners host software services to their end users. Product and license Product and license revenues are primarily derived from perpetual offerings related to the Company’s Workspace solutions and Networking products. For performance obligations related to perpetual software license agreements, the Company determined that its licenses are functional intellectual property that are distinct as the user can benefit from the software on its own. Support and services Support and services revenues include license updates, maintenance and professional services which are primarily related to the Company's perpetual offerings. License updates and maintenance revenues are primarily comprised of software and hardware maintenance, when and if-available updates and technical support. For performance obligations related to license updates and maintenance, revenue is generally recognized on a straight-line basis over the period of service because the Company transfers control evenly by providing a stand-ready service. The Company is continuously working on improving its products and pushing those updates through to the customer, and stands ready to provide software updates on a when and if-available basis. Services revenues are comprised of fees from consulting services primarily related to the implementation of the Company’s products and fees from product training and certification. The Company’s typical performance obligations include the following: Performance Obligation When Performance Obligation is Typically Satisfied Subscription Cloud-hosted offerings Over the contract term, beginning on the date that service is made available to the customer (over time) CSP As the usage occurs (over time) On-premise subscription software licenses When software activation keys have been made available for download (point in time) Product and license Software licenses When software activation keys have been made available for download (point in time) Hardware When control of the product passes to the customer; typically upon shipment (point in time) Support and services License updates and maintenance Ratably over the course of the service term (over time) Professional services As the services are provided (over time) Significant Judgments The Company generates all of its revenues from contracts with customers. At contract inception, the Company assesses the solutions or services, or bundles of solutions and services, obligated in the contract with a customer to identify each performance obligation within the contract, and then evaluates whether the performance obligations are capable of being distinct and distinct within the context of the contract. Solutions and services that are not both capable of being distinct and distinct within the context of the contract are combined and treated as a single performance obligation in determining the allocation and recognition of revenue. The standalone selling price is the price at which the Company would sell a promised product or service separately to the customer. For the majority of the Company's software licenses and hardware, CSP and on-premise subscription software licenses, the Company uses the observable price in transactions with multiple performance obligations. For the majority of the Company’s support and services, and cloud-hosted subscription offerings, the Company uses the observable price when the Company sells that support and service or cloud-hosted subscription separately to similar customers. If the standalone selling price for a performance obligation is not directly observable, the Company estimates it. The Company estimates a standalone selling price by taking into consideration market conditions, economics of the offering and customers’ behavior. The Company maximizes the use of observable inputs and applies estimation methods consistently in similar circumstances. The Company allocates the transaction price to each distinct performance obligation on a relative standalone selling price basis. Revenues are recognized when control of the promised products or services are transferred to customers, in an amount that reflects the consideration that the Company expects to receive in exchange for those products or services. Sales tax The Company records revenue net of sales tax. Timing of revenue recognition Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 (In thousands) Products and services transferred at a point in time $ 155,087 $ 159,326 $ 630,193 $ 500,450 Products and services transferred over time 612,083 573,575 1,796,851 1,700,291 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741 Contract balances The Company's short-term and long-term contract assets, net of allowance for credit losses, were $22.1 million and $29.5 million, respectively, as of September 30, 2020, and $12.2 million and $20.5 million, respectively, as of December 31, 2019, and are included in Prepaid expenses and other current assets and Other assets, respectively, in the accompanying condensed consolidated balance sheets. The Current portion of deferred revenues and the Long-term portion of deferred revenues were $1.31 billion and $378.4 million, respectively, as of September 30, 2020 and $1.35 billion and $443.5 million, respectively, as of December 31, 2019. The difference in the opening and closing balances of the Company’s contract assets and liabilities primarily results from the timing difference between the Company’s performance and the customer’s payment. During the three and nine months ended September 30, 2020, the Company recognized $512.4 million and $1.13 billion, respectively, of revenue that was included in the deferred revenue balances as of June 30, 2020 and December 31, 2019, respectively. The Company performs its obligations under a contract with a customer by transferring solutions and services in exchange for consideration from the customer. Accounts receivable are recorded when the right to consideration becomes unconditional. The timing of the Company’s performance often differs from the timing of the customer’s payment, which results in the recognition of a contract asset or a contract liability. The Company recognizes a contract asset when the Company transfers products or services to a customer and the right to consideration is conditional on something other than the passage of time. The Company recognizes a contract liability when it has received consideration or an amount of consideration is due from the customer and the Company has a future obligation to transfer products or services. The Company had no material asset impairment charges related to contract assets for either the three and nine months ended September 30, 2020 or September 30, 2019. For the Company’s software and hardware products, the timing of payment is typically upfront for its perpetual offerings and the Company’s on-premise subscriptions. Therefore, deferred revenue is created when a contract includes performance obligations such as license updates and maintenance or certain professional services that are satisfied over time. For subscription contracts, the timing of payment is typically in advance of services, and deferred revenue is created as these services are provided over time. A significant portion of the Company’s contracts have an original duration of one year or less; therefore, the Company applies a practical expedient to determine whether a significant financing component exists and does not consider the effects of the time value of money. For multi-year contracts, the Company bills annually. Transaction price allocated to the remaining performance obligations The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period (in thousands): <1-3 years 3-5 years 5 years or more Total Subscription $ 1,165,198 $ 76,272 $ 909 $ 1,242,379 Support and services 1,334,259 30,214 1,559 1,366,032 Total net revenues $ 2,499,457 $ 106,486 $ 2,468 $ 2,608,411 Contract acquisition costs The Company is required to capitalize certain contract acquisition costs consisting primarily of commissions paid and related payroll taxes when contracts are signed. The asset recognized from capitalized incremental and recoverable acquisition costs is amortized on a basis consistent with the pattern of transfer of the products or services to which the asset relates. The Company’s typical contracts include performance obligations related to product and licenses and support. In these contracts, incremental costs of obtaining a contract are allocated to the performance obligations based on the relative estimated standalone selling prices and then recognized on a basis that is consistent with the transfer of the goods or services to which the asset relates. The commissions paid on annual renewals of support for product and licenses are not commensurate with the initial commission. The costs allocated to product and licenses are expensed at the time of sale, when revenue for the product and functional software licenses is recognized. The costs allocated to customer support for product and licenses are amortized ratably over a period of the greater of the contract term or the average customer life, the expected period of benefit of the asset capitalized. The Company currently estimates an average customer life of three years to five years, which it believes is appropriate based on consideration of the historical average customer life and the estimated useful life of the underlying product and license sold as part of the transaction. Amortization of contract acquisition costs related to support is limited to the contractual period of the arrangement as the Company intends to pay a commensurate commission upon renewal of the related support. For contracts that contain multi-year services or subscriptions, the amortization period of the capitalized costs is the expected period of benefit, which is the greater of the contractual term or the expected customer life. The Company elects to apply a practical expedient to expense contract acquisition costs as incurred where the expected period of benefit is one year or less. For the three and nine months ended September 30, 2020, the Company recorded amortization of capitalized contract acquisition costs of $14.7 million and $41.6 million, respectively, and for the three and nine months ended September 30, 2019, the Company recorded amortization of capitalized contract acquisition costs of $11.4 million and $33.0 million, respectively, which is recorded in Sales, marketing and services expense in the accompanying condensed consolidated statements of income. The Company's short-term and long-term contract acquisition costs were $60.5 million and $99.8 million, respectively, as of September 30, 2020, and $50.4 million and $81.0 million, respectively, as of December 31, 2019, and are included in Prepaid expenses and other current assets and Other assets, respectively, in the accompanying condensed consolidated balance sheets. There was no impairment loss in relation to costs capitalized during the three and nine months ended September 30, 2020 and 2019, respectively.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Basic earnings per share is calculated by dividing income available to stockholders by the weighted-average number of common shares outstanding during each period. Diluted earnings per share is computed using the weighted-average number of common and dilutive common share equivalents outstanding during the period. Dilutive common share equivalents consist of shares issuable upon the exercise or settlement of stock awards and shares issuable under the employee stock purchase plan (calculated using the treasury stock method) during the period they were outstanding and potential dilutive common shares from the conversion spread on the Company’s 0.500% Convertible Notes due 2019 (the “Convertible Notes”) and the Company's warrants during the period they were outstanding. The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share information): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Numerator: Net income $ 98,227 $ 270,857 $ 392,355 $ 474,700 Denominator: Denominator for basic earnings per share - weighted-average shares outstanding 123,255 130,277 123,835 131,020 Effect of dilutive employee stock awards 2,608 1,823 2,572 2,050 Effect of dilutive Convertible Notes — — — 1,901 Effect of dilutive warrants — 555 — 1,326 Denominator for diluted earnings per share - weighted-average shares outstanding 125,863 132,655 126,407 136,297 Basic earnings per share $ 0.80 $ 2.08 $ 3.17 $ 3.62 Diluted earnings per share $ 0.78 $ 2.04 $ 3.10 $ 3.48 For the three and nine months ended September 30, 2020, there were no weighted-average number of shares outstanding used in the computation of diluted earnings per share for the Company's warrants, as they expired on November 18, 2019. For the three and nine months ended September 30, 2019, the weighted-average number of shares outstanding used in the computation of diluted earnings per share includes the dilutive effect of the Company's warrants, as the average stock price during the quarters was above the weighted-average warrant strike price of $94.18 per share and $94.52 per share, respectively. Anti-dilutive stock-based awards excluded from the calculations of diluted earnings per share were immaterial during the periods presented. The Company used the treasury stock method for calculating any potential dilutive effect of the conversion spread on its Convertible Notes on diluted earnings per share because upon conversion the Company paid cash up to the aggregate principal amount of the Convertible Notes converted and delivered shares of common stock in respect of the remainder of the Company’s conversion obligation in excess of the aggregate principal amount of the Convertible Notes converted. The conversion spread had a dilutive impact on diluted earnings per share when the average market price of the Company’s common stock for a given

Credit Losses

Credit Losses	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Credit Losses	CREDIT LOSSESThe Company is exposed to credit losses primarily through its accounts receivable, investments in available-for-sale debt securities, and contract assets. See Note 3 for additional information related to the Company's contract assets. Accounts receivable, net The Company's accounts receivable, which are typically due within one year, consist of the following (in thousands): September 30, 2020 Accounts receivable, gross $ 580,425 Less: allowance for returns (3,634) Less: allowance for credit losses (12,009) Accounts receivable, net $ 564,782 The allowance for credit losses on accounts receivable is determined using a combination of specific reserves for accounts that are deemed to exhibit credit loss indicators and general reserves that are judgmentally determined using loss rates based on historical write-offs by geography and customer accounts subject to credit check versus non-credit check status and consideration of recent forecasted information, including underlying economic expectations. The credit loss reserves are updated quarterly for most recent write-offs and collections information and underlying economic expectations , which for the nine months ended September 30, 2020 included consideration of the current and expected future economic and market conditions surrounding the COVID-19 pandemic. The Company will compare its current estimate of expected credit losses with the estimate of credit losses from the prior period and will report in net income the amount necessary to adjust the allowance for current expected credit losses. Credit loss expense is included within General and administrative expenses in the accompanying condensed consolidated statements of income. The activity in the Company's allowance for credit losses for the nine months ended September 30, 2020 is summarized as follows (in thousands): Total Balance of allowance for credit losses at January 1, 2020 $ 6,161 Adjustment for ASC 326 adoption 1,245 Current period provision for expected losses 5,884 Write-offs charged against allowance (1,349) Recoveries of any amounts previously written off 68 Balance of allowance for credit losses at September 30, 2020 $ 12,009 As of September 30, 2020, one distributor accounted for 19% of the Company's total gross accounts receivable. Available-for-sale Investments The allowance for credit losses on the Company's investments in available-for-sale debt securities is determined using a quantitative discounted cash flow analysis if impairment triggers exist after a qualitative screen is completed. Impairment on available-for-sale debt securities is determined on an individual security basis and the security is subject to impairment when its fair value declines below its amortized cost basis. If the fair value is less than the amortized cost basis, management must then determine whether it intends to sell the security or whether it is more likely than not that it will be required to sell the security before it recovers its value. If management intends to sell the security or will more-likely-than-not be required to sell the impaired security before it recovers its value, a credit loss is recorded to Other income, net in the accompanying condensed consolidated statements of inc ome. If management does not intend to sell the security, nor will it more-likely-than-not be required to sell the security before the security recovers its value, management must then determine whether the loss is due to credit loss or other factors. For impairment indicators due to credit loss factors, management establishes an allowance for credit losses with a charge to Other income, net. F or impairment indicators due to other factors, management records the loss with a charge to Other comprehensive loss in the accompanying condensed consolidated balance sheets. Upon adoption of the credit loss standard, the Company established an allowance for credit losses and did not ha ve any credit loss expense recorded related to available-for-sale debt securities for the nine months ended September 30, 2020. See Note 6 for more information on allowances for credit losses related to available-for-sale debt securities.

Investments

Investments	9 Months Ended
	Sep. 30, 2020
Investments [Abstract]
INVESTMENTS	INVESTMENTS Available-for-sale Investments Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands): September 30, 2020 Description of the Securities Amortized Gross Gross Allowance Fair Value Agency securities $ 39,993 $ 2 $ — $ — $ 39,995 Corporate securities 197,239 4 (12) (147) 197,084 Government securities 132,475 1 (7) — 132,469 Total $ 369,707 $ 7 $ (19) $ (147) $ 369,548 December 31, 2019 Description of the Securities Amortized Gross Gross Fair Value Agency securities $ 1,681 $ 1 $ — $ 1,682 Corporate securities 49,027 6 (149) 48,884 Government securities 9,124 5 — 9,129 Total $ 59,832 $ 12 $ (149) $ 59,695 The change in net unrealized gains (losses) on available-for-sale securities recorded in Other comprehensive income (loss) includes unrealized gains (losses) that arose from changes in market value, excluding credit-related factors, of specifically identified securities that were held during the period, gains (losses) that were previously unrealized, but have been recognized in current period net income due to sales, and prepayments of available-for-sale investments purchased at a premium. See Note 13 for more information related to comprehensive income. The average remaining maturities of the Company’s short-term and long-term available-for-sale investments at September 30, 2020 were approximately three months and two years, respectively. For the three and nine months ended September 30, 2020, the Company did not receive any proceeds from the sales of available-for-sale investments. For the three months ended September 30, 2019, the Company had no proceeds from the sales of available-for-sale investments. For the nine months ended September 30, 2019, the Company received proceeds from the sales of available-for-sale investments of $938.0 million. Realized and Unrealized Gains and Losses on Available-for-sale Investments For the three and nine months ended September 30, 2020, the Company did not have any realized gains on available-for-sale investments. For the three months ended September 30, 2019, the Company had no realized gains of available-for-sale investments. For the nine months ended September 30, 2019, the Company had realized gains on available-for-sale investments of $1.5 million. Effective January 1, 2020, the new CECL guidance requires the recognition of an allowance for estimated credit losses on investments in available-for-sale debt securities. For the three and nine months ended September 30, 2020, the Company did not have any realized losses on available-for-sale investments. For the three months ended September 30, 2019, the Company did not have any realized losses on available-for-sale investments. For the nine months ended September 30, 2019, the Company had realized losses on available-for-sale investments of $0.9 million. Realized losses primarily related to sales of these investments during the respective periods. All realized gains and losses related to the sales of available-for-sale investments are included in Other income, net, in the accompanying condensed consolidated statements of income. As of December 31, 2019, the Company's gross unrealized losses on available-for-sale investments were $0.1 million and were not deemed to be other-than-temporarily impaired under the prior accounting guidance. Equity Securities without Readily Determinable Fair Values The Company held direct investments in privately-held companies of $12.3 million as of September 30, 2020 and December 31, 2019, which are accounted for at cost, less impairment plus or minus adjustments resulting from observable price changes in orderly transactions for an identical or a similar investment of the same issuer. These investments are included in Other assets in the accompanying condensed consolidated balance sheets. The Company periodically reviews these investments for impairment and observable price changes on a quarterly basis, and adjusts the carrying value accordingly. The fair value of these investments represent a Level 3 valuation as the assumptions used in valuing these investments are not directly or indirectly observable. See Note 7 for detailed information on fair value measurements. Equity Securities Accounted for at Net Asset Value

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The authoritative guidance defines fair value as an exit price, representing the amount that would either be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: • Level 1. Observable inputs such as quoted prices in active markets for identical assets or liabilities; • Level 2 . Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 . Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. Available-for-sale securities included in Level 2 are valued utilizing inputs obtained from an independent pricing service (the “Service”) which uses quoted market prices for identical or comparable instruments rather than direct observations of quoted prices in active markets. The Service applies a four level hierarchical pricing methodology to all of the Company’s fixed income securities based on the circumstances. The hierarchy starts with the highest priority pricing source, then subsequently uses inputs obtained from other third-party sources and large custodial institutions. The Service’s providers utilize a variety of inputs to determine their quoted prices. These inputs may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes. Substantially all of the Company’s available-for-sale investments are valued utilizing inputs obtained from the Service and accordingly are categorized as Level 2 in the table below. The Company periodically independently assesses the pricing obtained from the Service and historically has not adjusted the Service's pricing as a result of this assessment. Available-for-sale securities are included in Level 3 when relevant observable inputs for a security are not available. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy. In certain instances, the inputs used to measure fair value may meet the definition of more than one level of the fair value hierarchy. The input with the lowest level priority is used to determine the applicable level in the fair value hierarchy. Assets and Liabilities Measured at Fair Value on a Recurring Basis As of September 30, 2020 Quoted Significant Significant (In thousands) Assets: Cash and cash equivalents: Cash $ 548,220 $ 548,220 $ — $ — Money market funds 8,264 8,264 — — Corporate securities 2,342 — 2,342 — Government securities 9,998 — 9,998 — Available-for-sale securities: Agency securities 39,995 — 39,995 — Corporate securities 197,084 — 196,584 500 Government securities 132,469 — 132,469 — Prepaid expenses and other current assets: Foreign currency derivatives 2,165 — 2,165 — Total assets $ 940,537 $ 556,484 $ 383,553 $ 500 Accrued expenses and other current liabilities: Foreign currency derivatives 6,069 — 6,069 — Total liabilities $ 6,069 $ — $ 6,069 $ — As of December 31, 2019 Quoted Significant Significant (In thousands) Assets: Cash and cash equivalents: Cash $ 474,756 $ 474,756 $ — $ — Money market funds 42,019 42,019 — — Agency securities 19,993 — 19,993 — Corporate securities 8,993 — 8,993 — Available-for-sale securities: Agency securities 1,682 — 1,682 — Corporate securities 48,884 — 47,884 1,000 Government securities 9,129 — 9,129 — Prepaid expenses and other current assets: Foreign currency derivatives 1,889 — 1,889 — Total assets $ 607,345 $ 516,775 $ 89,570 $ 1,000 Accrued expenses and other current liabilities: Foreign currency derivatives 1,390 — 1,390 — Total liabilities $ 1,390 $ — $ 1,390 $ — The Company’s fixed income available-for-sale security portfolio generally consists of investment grade securities from diverse issuers with a minimum credit rating of A-/A3 and a weighted-average credit rating of AA-/Aa3. The Company values these securities based on pricing from the Service, whose sources may use quoted prices in active markets for identical assets (Level 1 inputs) or inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs) in determining fair value, and accordingly, the Company classifies the majority of its fixed income available-for-sale securities as Level 2. Assets Measured at Fair Value on a Non-recurring Basis Using Significant Unobservable Inputs (Level 3) During the three months ended September 30, 2020, certain direct investments in privately-held companies with a carrying value of $5.0 million were determined to be impaired and written down to a fair value of $4.6 million, resulting in an impairment charge of $0.4 million. During the nine months ended September 30, 2020, certain direct investments in privately-held companies with a carrying value of $6.3 million were determined to be impaired and written down to a fair value of $4.6 million, resulting in an impairment charge of $1.7 million. The impairment charges were included in Other income, net in the accompanying condensed consolidated statements of income. During the three months ended September 30, 2019, certain direct investments in privately-held companies with a carrying value of $0.5 million were determined to be impaired and written down to their fair value of $0.1 million, resulting in impairment charges of $0.4 million. During the nine months ended September 30, 2019, certain direct investments in privately-held companies with a carrying value of $2.4 million were determined to be impaired and written down to their fair value of $0.4 million, resulting in impairment charges of $2.0 million. The impairment charges were included in Other income, net in the accompanying condensed consolidated statements of income. In determining the fair value of the investments, the Company considers many factors, including, but not limited to, operating performance of the investee, the amount of cash that the investee has on-hand, the ability to obtain additional financing and the overall market conditions in which the investee operates. Additional Disclosures Regarding Fair Value Measurements The carrying value of accounts receivable, accounts payable and accrued expenses approximate their fair value due to the short maturity of these items. As of September 30, 2020, the fair value of the $750.0 million unsecured senior notes due March 1, 2030 (the "2030 Notes") and $750.0 million unsecured senior notes due December 1, 2027 (the “2027 Notes") was determined based on inputs that are observable in the market (Level 2). Based on the closing trading price per $100 as of the last day of trading for the quarter ended September 30, 2020, the carrying value was as follows (in thousands): Fair Value Carrying Value 2030 Notes $ 798,443 $ 738,811 2027 Notes $ 862,103 $ 743,593

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION Plans The Company’s stock-based compensation program is a long-term retention program that is intended to attract and reward talented employees and align stockholder and employee interests. As of September 30, 2020, the Company had one stock-based compensation plan under which it was granting equity awards. The Company is currently granting stock-based awards from its Second Amended and Restated 2014 Equity Incentive Plan (the "2014 Plan"), which was recently amended at the Company's Annual Meeting of Stockholders on June 3, 2020. Pursuant to the June 2020 amendment, the maximum number of shares of common stock available for issuance under the 2014 Plan was increased to 51,300,000. In addition, the amendment extended the term of the 2014 Plan to June 3, 2030 and updated the vesting provisions from monthly to annual vesting for annual director awards, consistent with the Company's current compensation program for non-employee directors. As of September 30, 2020, there were 18,516,165 shares of common stock reserved for issuance pursuant to the Company’s stock-based compensation plans, including authorization under its 2014 Plan to grant stock-based awards covering 12,718,506 shares of common stock. The Company also has an Employee Stock Purchase Plan (the “ESPP”), which provides for the issuance of a maximum of 16,000,000 shares of common stock. As of September 30, 2020, 2,675,657 shares have been issued under the ESPP. The Company recorded stock-based compensation costs related to the ESPP of $4.2 million and $4.0 million for the three months ended September 30, 2020 and 2019, respectively, and $8.8 million and $9.5 million for the nine months ended September 30, 2020 and 2019, respectively. The Company used the Black-Scholes model to estimate the fair value of the ESPP awards with the following weighted-average assumptions: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Expected volatility factor 0.21 - 0.35 0.22 - 0.29 0.21 - 0.35 0.22 - 0.29 Risk free interest rate 0.13% - 1.56% 2.06% - 2.49% 0.13% - 2.06% 2.06% - 2.49% Expected dividend yield 0.92% - 1.20% 1.31% - 1.39% 0.92% - 1.39% 1.27% - 1.39% Expected life (in years) 0.5 0.5 0.5 0.5 The Company determined the expected volatility factor by considering the implied volatility in six-month market-traded options of the Company's common stock based on third-party volatility quotes. The Company's decision to use implied volatility was based upon the availability of actively traded options on the Company's common stock and its assessment that implied volatility is more representative of future stock price trends than historical volatility. The risk-free interest rate was based on a U.S. Treasury instrument whose term is consistent with the expected term of the stock options. The current dividend yield has been updated for expected dividend yield payout. The expected term was based on the term of the purchase period for grants made under the ESPP. Stock-Based Compensation The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, Income Statement Classifications 2020 2019 2020 2019 Cost of subscription, support and services $ 3,542 $ 2,898 $ 9,708 $ 8,056 Research and development 28,803 25,505 81,386 78,761 Sales, marketing and services 28,411 23,838 76,640 68,188 General and administrative 24,413 16,728 61,120 47,518 Total $ 85,169 $ 68,969 $ 228,854 $ 202,523 Non-vested Stock Units Service-Based Stock Units The Company awards senior level employees and certain other employees non-vested stock units granted under the 2014 Plan that vest based on service. These non-vested stock unit awards vest 33.33% on each of the first, second and third anniversary subsequent to the grant date of the award. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company’s common stock. In addition, the Company awards non-vested stock units to all of its continuing non-employee directors, which represent the right to receive one share of the Company's common stock upon vesting. Previously, non-vested stock unit awards granted to the Company's continuing non-employee directors vested monthly in 12 equal installments. Beginning in 2020, new awards granted to non-employee directors will vest in full in one installment on the earlier of: (i) the first anniversary of the award date; or (ii) the day immediately prior to the Company’s next annual meeting of the stockholders following the award date. Company Performance Stock Units On April 1, 2020, the Company awarded senior level employees 294,605 non-vested performance stock unit awards granted under the 2014 Plan. The number of non-vested performance stock units that ultimately vest will be determined within sixty days following completion of the performance period ending December 31, 2022 and will be based on the achievement of specific corporate financial performance goals related to the Company’s annualized recurring revenue (ARR) growth measured during the period from January 1, 2020 to December 31, 2022. The number of non-vested stock units issued will be based on a graduated slope, with the maximum number of non-vested stock units issuable pursuant to the award capped at 200% of the target number of non-vested stock units set forth in the award agreement. The Company is required to estimate the attainment expected to be achieved related to the defined performance goals and the number of non-vested stock units that will ultimately be awarded in order to recognize compensation expense over the vesting period. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company’s common stock. Compensation expense will be recorded through the end of the performance period on December 31, 2022 if it is deemed probable that the performance goals will be met. If the performance goals are not met, no compensation cost will be recognized and any previously recognized compensation cost will be reversed. On April 6, 2020, the Company awarded certain senior level employees 90,756 non-vested performance stock unit awards granted under the 2014 Plan that vest based on the Company’s ARR growth during the relevant performance periods, which span January 1, 2020 through December 31, 2021. The number of non-vested stock units issued upon the vesting of the award will be based on a graduated slope, with the maximum number of non-vested stock units issuable pursuant to the award capped at 125% of the target number of non-vested stock units set forth in the award agreement. The Company is required to estimate the attainment expected to be achieved related to the defined performance goals and the number of non-vested stock units that will ultimately be awarded in order to recognize compensation expense over the vesting period. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company’s common stock. Compensation expense will be recorded through the end of the performance period on December 31, 2021 if it is deemed probable that the performance goals will be met. If the performance goals are not met, no compensation cost will be recognized and any previously recognized compensation cost will be reversed. Unrecognized Compensation Related to Stock Units

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill The Company accounts for goodwill in accordance with the authoritative guidance, which requires that goodwill and certain intangible assets are not amortized, but are subject to an annual impairment test. The Company performed a qualitative assessment in connection with its annual goodwill impairment test in the fourth quarter of 2019. As a result of the qualitative analysis, a quantitative impairment test was not deemed necessary. There was no impairment of goodwill or indefinite lived intangible assets as a result of the annual impairment test analysis completed during the fourth quarter of 2019. The balance of goodwill at September 30, 2020 and December 31, 2019 was $1.80 billion. Intangible Assets The Company has intangible assets which were primarily acquired in conjunction with business combinations and technology purchases. Intangible assets with finite lives are recorded at cost, less accumulated amortization. Amortization is computed over the estimated useful lives of the respective assets, generally three seven Intangible assets consist of the following (in thousands): September 30, 2020 December 31, 2019 Gross Carrying Accumulated Gross Carrying Accumulated Product related intangible assets $ 740,593 $ 658,509 $ 734,973 $ 633,633 Other 187,173 182,133 187,173 180,035 Total $ 927,766 $ 840,642 $ 922,146 $ 813,668 Amortization and impairment of product related intangible assets, which consists primarily of product related technologies and patents, was $8.3 million and $22.6 million for the three months ended September 30, 2020 and 2019, respectively, and $24.9 million and $42.7 million for the nine months ended September 30, 2020 and 2019, respectively, and is classified as a component of Cost of net revenues in the accompanying condensed consolidated statements of income. Amortization of other intangible assets, which consist primarily of customer relationships, trade names and covenants not to compete was $0.7 million and $4.9 million for the three months ended September 30, 2020 and 2019, respectively, and $2.1 million and $11.7 million for the nine months ended September 30, 2020 and 2019, respectively, and is classified as a component of Operating expenses in the accompanying condensed consolidated statements of income. The Company monitors its intangible assets for indicators of impairment. If the Company determines impairment has occurred, it will write-down the intangible asset to its fair value. For certain intangible assets where the unamortized balances exceeded the undiscounted future net cash flows, the Company measures the amount of the impairment by calculating the amount by which the carrying values exceed the estimated fair values, which are based on projected discounted future net cash flows. During the three months ended September 30, 2019, the Company tested certain intangible assets for recoverability and, as a result, identified certain definite-lived intangible assets, primarily technology developed by Cedexis Inc., which was acquired by the Company on February 6, 2018, that were impaired and recorded non-cash impairment charges of $13.2 million to write down the intangible assets to their estimated fair value of $4.1 million. The impairment charge is included in Amortization and impairment of product related intangible assets in the accompanying condensed consolidated statements of income. These non-recurring fair value measurements were categorized as Level 3, as significant unobservable inputs were used in the valuation analysis. Key assumptions used in the valuation include forecasts of revenue and expenses over an extended period of time, customer churn rates, rate of migration to future technology, tax rates, and estimated costs of debt and equity capital to discount the projected cash flows. Certain of these assumptions involve significant judgment, are based on management’s estimate of current and forecasted market conditions and are sensitive and susceptible to change; therefore, further disruptions in the business could potentially result in additional amounts becoming impaired. Estimated future amortization expense of intangible assets with finite lives as of September 30, 2020 is as follows (in thousands): Year ending December 31, 2020 (remaining three months) $ 8,569 2021 23,590 2022 21,391 2023 17,124 2024 6,090 Thereafter 10,360 Total $ 87,124

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION Citrix has one reportable segment. The Company's chief operating decision maker (“CODM”) reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. The Company's CEO is the CODM.Revenues by Product Grouping Revenues by product grouping were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Net revenues: Workspace (1) $ 573,342 $ 512,838 $ 1,811,936 $ 1,562,508 Networking (2) 166,166 188,191 532,169 537,628 Professional services (3) 27,662 31,872 82,939 100,605 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741 (1) Workspace revenues are primarily comprised of sales from the Company’s application virtualization solutions, which include Citrix Workspace, Citrix Virtual Apps and Desktops, the Company's unified endpoint management solutions, which include Citrix Endpoint Management and Citrix Content Collaboration. (2) Networking revenues primarily include Citrix ADC and Citrix SD-WAN. Beginning in the fourth quarter of 2020, the Company is renaming its Networking product grouping to App Delivery and Security to better align with industry categorization of its solutions. (3) Professional services revenues are comprised of revenues from consulting services primarily related to the Company's perpetual offerings and product training and certification services. The following table presents revenues by geographic location, for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Net revenues: Americas $ 414,341 $ 418,301 $ 1,330,666 $ 1,251,729 EMEA 276,494 236,081 847,454 713,282 APJ 76,335 78,519 248,924 235,730 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741 Strategic Service Providers The Company defines Strategic Service Providers (SSP) as its three historically largest hyperscale Networking customers. The following table summarizes SSP revenue for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Net revenues: SSP revenue $ 21,589 $ 38,475 $ 71,091 $ 84,307 Non-SSP revenue 745,581 694,426 2,355,953 2,116,434 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741 Subscription Revenue Subscription revenue relates to fees which are generally recognized ratably over the contractual term. The Company's subscription revenue includes Software as a Service (SaaS), which primarily consists of subscriptions delivered via a cloud-hosted service whereby the customer does not take possession of the software and hybrid subscription offerings; and non-SaaS, which consists primarily of on-premise licensing, hybrid subscription offerings, CSP services and the related support. The Company's hybrid subscription offerings are allocated between SaaS and non-SaaS, which are generally recognized at a point in time. The following table presents subscription revenues by SaaS and non-SaaS components, for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Subscription: SaaS $ 137,831 $ 100,857 $ 391,019 $ 277,512 Non-SaaS 124,773 59,016 383,271 179,800 Total Subscription revenue $ 262,604 $ 159,873 $ 774,290 $ 457,312

Debt

Debt	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
DEBT	DEBT The components of the Company's long-term debt were as follows (in thousands): September 30, 2020 December 31, 2019 Term Loan Credit Agreement $ 250,000 $ — 2027 Senior Notes 750,000 750,000 2030 Senior Notes 750,000 — Total face value 1,750,000 750,000 Less: unamortized discount (5,755) (1,291) Less: unamortized issuance costs (12,176) (5,783) Total long-term debt $ 1,732,069 $ 742,926 Term Loan Credit Agreement On January 21, 2020, the Company entered into a Term Loan Credit Agreement (the "Term Loan Credit Agreement") with Bank of America, N.A., as administrative agent, and the other lenders party thereto from time to time (collectively, the “Lenders”). The Term Loan Credit Agreement provides the Company with facilities to borrow term loans on an unsecured basis in an aggregate principal amount of up to $1.00 billion, consisting of (i) a $500.0 million 364-day term loan facility (the “364-day Term Loan”), and (ii) a $500.0 million 3-year term loan (the “3-year Term Loan”), in each case in a single borrowing, subject to satisfaction of certain conditions set forth in the Term Loan Credit Agreement. On January 30, 2020, the Company borrowed $1.00 billion under the term loans and used the proceeds to enter into accelerated share repurchase transactions (the "ASR") with each of Goldman Sachs & Co. LLC and Wells Fargo Bank, National Association (each, a "Dealer") for an aggregate of $1.00 billion. See Note 15 for detailed information on the accelerated share repurchase. Borrowings under the Term Loan Credit Agreement bear interest at a rate equal to (a) either (i) LIBOR or, upon a phase-out of LIBOR, an alternative benchmark rate as provided in the Term Loan Credit Agreement, or (ii) a customary base rate formula, plus (b) the applicable margin with respect thereto, which initially will be determined based on the Company’s consolidated leverage ratio but may, if so elected by the Company, be based on the Company’s non-credit enhanced, senior unsecured long-term debt rating as determined by Moody’s Investors Service, Inc., Standard & Poor’s Financial Services, LLC and Fitch Ratings Inc., in each case as set forth in the Term Loan Credit Agreement. The Term Loan Credit Agreement includes a covenant limiting the Company’s consolidated leverage ratio to not more than 3.5:1.0, subject to, upon the occurrence of a qualified acquisition, if so elected by the Company, a step-up to 4.0:1.0 for the four fiscal quarters following such qualified acquisition, and a covenant limiting the Company’s consolidated interest coverage ratio to not less than 3.0:1.0. The Term Loan Credit Agreement includes customary events of default, with corresponding grace periods in certain circumstances, including, without limitation, payment defaults, cross-defaults, the occurrence of a change of control of the Company and bankruptcy-related defaults. The Lenders are entitled to accelerate repayment of the loans under the Term Loan Credit Agreement upon the occurrence of any of the events of default. In addition, the Term Loan Credit Agreement contains customary affirmative and negative covenants, including covenants that limit or restrict the ability of the Company to grant liens, merge or consolidate, dispose of all or substantially all of its assets, change its business and incur subsidiary indebtedness, in each case subject to customary exceptions. In addition, the Term Loan Credit Agreement requires the Company to make prepayments of any net cash proceeds received in connection with the Company issuing or incurring debt or issuing equity, subject to certain ordinary course exceptions described in the Term Loan Credit Agreement. The Term Loan Credit Agreement also contains representations and warranties customary for an unsecured financing of this type. The Company was in compliance with these covenants as of September 30, 2020. Senior Notes On February 25, 2020, the Company issued $750.0 million of unsecured senior notes due March 1, 2030. The 2030 Notes accrue interest at a rate of 3.300% per annum. Interest on the 2030 Notes is due semi-annually on March 1 and September 1 of each year, beginning on September 1, 2020. The net proceeds from this offering were $738.1 million, after deducting the underwriting discount and estimated offering expenses payable by the Company. Net proceeds from this offering were primarily used to repay amounts outstanding under the Company's unsecured Term Loan Credit Agreement. The 2030 Notes will mature on March 1, 2030, unless earlier redeemed in accordance with their terms prior to such date. The Company may redeem the 2030 Notes at its option at any time in whole or from time to time in part prior to December 1, 2029 at a redemption price equal to the greater of (i) 100% of the aggregate principal amount of the 2030 Notes to be redeemed and (ii) the sum of the present values of the remaining scheduled payments of such Notes under such 2030 Notes, plus in each case, accrued and unpaid interest to, but excluding, the redemption date. At any time on or after December 1, 2029, the redemption price shall be equal to 100% of the aggregate principal amount of the 2030 Notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. Among other terms, under certain circumstances, holders of the 2030 Notes may require the Company to repurchase their 2030 Notes upon the occurrence of a change of control prior to maturity for cash at a repurchase price equal to 101% of the principal amount of the 2030 Notes to be repurchased plus accrued and unpaid interest to, but excluding, the repurchase date. During the nine months ended September 30, 2020, the Company used the net proceeds from the 2030 Notes and cash to repay $500.0 million under the 364-day Term Loan and $250.0 million under the 3-year Term Loan. As of September 30, 2020, $250.0 million in principal amount was outstanding under the 3-year Term Loan. On November 15, 2017, the Company issued $750.0 million of unsecured senior notes due December 1, 2027. The 2027 Notes accrue interest at a rate of 4.500% per annum. Interest on the 2027 Notes is due semi-annually on June 1 and December 1 of each year. The 2027 Notes will mature on December 1, 2027, unless earlier redeemed in accordance with their terms prior to such date. The Company may redeem the 2027 Notes at its option at any time in whole or from time to time in part prior to September 1, 2027 at a redemption price equal to the greater of (i) 100% of the aggregate principal amount of the 2027 Notes to be redeemed and (ii) the sum of the present values of the remaining scheduled payments under such 2027 Notes, plus in each case, accrued and unpaid interest to, but excluding, the redemption date. Among other terms, under certain circumstances, holders of the 2027 Notes may require the Company to repurchase their 2027 Notes upon the occurrence of a change of control prior to maturity for cash at a repurchase price equal to 101% of the principal amount of the 2027 Notes to be repurchased plus accrued and unpaid interest to, but excluding, the repurchase date. Credit Facility On November 26, 2019, the Company entered into an amended and restated credit agreement (the "Credit Agreement") with a group of financial institutions, which amends and restates the Company’s Credit Agreement, dated January 7, 2015. The Credit Agreement provides for a five Convertible Notes During 2014, the Company completed a private placement of approximately $1.44 billion principal amount of 0.500% Convertible Notes due 2019. All Convertible Notes were converted by their beneficial owners prior to their maturity on April 15, 2019. In accordance with the terms of the indenture governing the Convertible Notes, on April 15, 2019 the Company paid $1.16 billion in the outstanding aggregate principal amount of the Convertible Notes and delivered 4.9 million newly issued shares of its common stock in respect of the remainder of the Company's conversion obligation in excess of the aggregate principal amount of the Convertible Notes being converted, in full satisfaction of such converted notes. The Company received shares of its common stock under the Bond Hedges (as defined below) that offset the issuance of shares of common stock upon conversion of the Convertible Notes. The following table includes total interest expense recognized related to the Term Loan Credit Agreement, the 2030 Notes, the 2027 Notes and the Convertible Notes (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Contractual interest expense $ 15,918 $ 8,438 $ 45,734 $ 26,945 Amortization of debt issuance costs 393 182 1,780 1,488 Amortization of debt discount 161 41 410 8,232 $ 16,472 $ 8,661 $ 47,924 $ 36,665 See Note 7 for fair value disclosures related to the Company's 2030 Notes and 2027 Notes. Convertible Note Hedge and Warrant Transactions To minimize the impact of potential dilution upon conversion of the Convertible Notes, the Company entered into convertible note hedge transactions relating to approximately 16.0 million shares of common stock (the "Bond Hedges") and also entered into separate warrant transactions (the "Warrant Transactions") with each of the Option Counterparties relating to approximately 16.0 million shares of common stock to offset any payments in cash or shares of common stock at the Company’s election. As a result of the spin-off of its GoTo Business in January 2017, the number of shares of the Company's common stock covered by the Bond Hedges and Warrant Transactions was adjusted to approximately 20.0 million shares. As noted above, the Bond Hedges reduced the dilution upon conversion of the Convertible Notes, as the market price per share of common stock, as measured under the terms of the Bond Hedges, was greater than the strike price of the Bond Hedges, which initially corresponded to the conversion price of the Convertible Notes and was subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the Convertible Notes. The Warrant Transactions would have separately had a dilutive effect to the extent that the market value per share of common stock, as measured under the terms of the Warrant Transactions, exceeded the applicable strike price of the warrants issued pursuant to the Warrant Transactions (the “Warrants”).

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS Derivatives Designated as Hedging Instruments As of September 30, 2020, the Company’s derivative assets and liabilities primarily resulted from cash flow hedges related to its forecasted operating expenses transacted in local currencies. A substantial portion of the Company’s overseas expenses are and will continue to be transacted in local currencies. To protect against fluctuations in operating expenses and the volatility of future cash flows caused by changes in currency exchange rates, the Company has established a program that uses foreign exchange forward contracts to hedge its exposure to these potential changes. The terms of these instruments, and the hedged transactions to which they relate, generally do not exceed 12 months. Generally, when the dollar is weak, foreign currency denominated expenses will be higher, and these higher expenses will be partially offset by the gains realized from the Company’s hedging contracts. Conversely, if the dollar is strong, foreign currency denominated expenses will be lower. These lower expenses will in turn be partially offset by the losses incurred from the Company’s hedging contracts. Derivative instruments are recognized as either assets or liabilities and are measured at fair value. The accounting for changes in the fair value of a derivative depends on the intended use of the derivative and the resulting designation. Gains and losses on derivatives that are designated as cash flow hedges are initially reported as a component of Accumulated other comprehensive loss and are subsequently recognized in income when the hedged exposure is recognized in income. Gains and losses from changes in fair values of derivatives that are not designated as hedges are recognized in Other income, net. The total cumulative unrealized gain on cash flow derivative instruments was $1.5 million at September 30, 2020, and is included in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets. The net unrealized gain as of September 30, 2020 is expected to be recognized in income over the next 12 months at the same time the hedged items are recognized in income. See Note 13 for more information related to comprehensive income. Derivatives not Designated as Hedging Instruments A substantial portion of the Company’s overseas assets and liabilities are and will continue to be denominated in local currencies. To protect against fluctuations in earnings caused by changes in currency exchange rates when remeasuring the Company’s balance sheet, the Company utilizes foreign exchange forward contracts to hedge its exposure to this potential volatility. These contracts are not designated for hedge accounting treatment under the authoritative guidance. Accordingly, changes in the fair value of these contracts are recorded in Other income, net. Fair Values of Derivative Instruments Asset Derivatives Liability Derivatives (In thousands) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Derivatives Designated as Hedging Instruments Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Foreign currency forward contracts Prepaid $2,112 Prepaid $1,335 Accrued $429 Accrued $371 Asset Derivatives Liability Derivatives (In thousands) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Derivatives Not Designated as Hedging Instruments Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Foreign currency forward contracts Prepaid $53 Prepaid $554 Accrued $5,640 Accrued $1,019 The Effect of Derivative Instruments on Financial Performance For the Three Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Location of (Loss) Gain Reclassified Amount of (Loss) Gain Reclassified from Accumulated Other 2020 2019 2020 2019 Foreign currency forward contracts $ 2,123 $ (1,936) Operating expenses $ (390) $ 162 For the Nine Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other 2020 2019 2020 2019 Foreign currency forward contracts $ 667 $ (610) Operating expenses $ (1,061) $ (829) For the Three Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Amount of (Loss) Gain Recognized 2020 2019 Foreign currency forward contracts Other income, net $ (7,407) $ 4,108 For the Nine Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Amount of (Loss) Gain Recognized 2020 2019 Foreign currency forward contracts Other income, net $ (4,878) $ 2,128 Outstanding Foreign Currency Forward Contracts As of September 30, 2020, the Company had the following net notional foreign currency forward contracts outstanding (in thousands): Foreign Currency Currency Australian Dollar AUD 30,400 Brazilian Real BRL 2,800 Pounds Sterling GBP 5,200 Canadian Dollar CAD 350 Chinese Yuan Renminbi CNY 35,600 Czech Koruna CZK 2,900 Danish Krone DKK 5,650 Euro EUR 164 Hong Kong Dollar HKD 11,400 Indian Rupee INR 456,000 Japanese Yen JPY 171,000 Korean Won KRW 3,073,000 Singapore Dollar SGD 12,300 Swiss Franc CHF 167,055

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
COMPREHENSIVE INCOME	COMPREHENSIVE INCOME The changes in Accumulated other comprehensive loss by component, net of tax, are as follows: Foreign currency Unrealized loss on available-for-sale securities Unrealized gain on derivative instruments Other comprehensive loss on pension liability Total (In thousands) Balance at December 31, 2019 $ (2,946) $ (139) $ 868 $ (2,910) $ (5,127) Other comprehensive income (loss) before reclassifications — 145 (394) 8 (241) Amounts reclassified from accumulated other comprehensive loss — (20) 1,061 — 1,041 Net current period other comprehensive income — 125 667 8 800 Balance at September 30, 2020 $ (2,946) $ (14) $ 1,535 $ (2,902) $ (4,327) Income tax expense or benefit allocated to each component of other comprehensive income is not material. Reclassifications out of Accumulated other comprehensive loss are as follows: For the Three Months Ended September 30, 2020 (In thousands) Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss, net of tax Affected line item in the Condensed Consolidated Statements of Income Unrealized net losses on available-for-sale securities $ 1 Other income, net Unrealized net losses on cash flow hedges 390 Operating expenses * $ 391 For the Nine Months Ended September 30, 2020 (In thousands) Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss, net of tax Affected line item in the Condensed Consolidated Statements of Income Unrealized net gains on available-for-sale securities $ (20) Other income, net Unrealized net losses on cash flow hedges 1,061 Operating expenses * $ 1,041

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company is required to estimate its income taxes in each of the jurisdictions in which it operates as part of the process of preparing its condensed consolidated financial statements. The Company maintains certain strategic management and operational activities in overseas subsidiaries and its foreign earnings are taxed at rates that are generally lower than in the United States. The Company’s effective tax rate generally differs from the U.S. federal statutory rate primarily due to tax credits and lower tax rates on earnings generated by the Company’s foreign operations that are taxed primarily in Switzerland. The Company’s effective tax rate was 15.3% and (150.5)% for the three months ended September 30, 2020 and 2019, respectively. The increase in the effective tax rate when comparing the three months ended September 30, 2020 to the three months ended September 30, 2019, was primarily due to tax items unique to the period ended September 30, 2019. These amounts include an estimated income tax benefit of $157.7 million due to the recognition of Swiss deferred tax assets related to the enactment of the Federal Act on Tax Reform and AHV Financing (“TRAF”) , as well as a $17.3 million tax benefit attributable to the 2015 U.S. federal income tax return statute of limitations closing during the three months ended September 30, 2019. The Company’s effective tax rate was 10.0% and (42.3)% for the nine months ended September 30, 2020 and 2019, respectively. T he increase in the effective tax rate when comparing the nine months ended September 30, 2020 to the nine months ended September 30, 2019, was primarily due to tax items unique to the period ended September 30, 2019. These amounts include an estimated income tax benefit of $157.7 million due to the recognition of Swiss deferred tax assets related to the enactment of the TRAF, as well as a $17.3 million tax benefit attributable to the 2015 U.S. federal income tax return statute of limitations closing during the nine months ended September 30, 2019. These amounts are partially offset by additional discrete tax benefits for share-based payments during the nine months ended September 30, 2020. On May 19, 2019, Swiss voters approved the TRAF, which provides for broad changes to federal and cantonal taxation in Switzerland effective January 1, 2020. The TRAF requires the abolishment of certain favorable tax regimes, provides for certain transitional relief, and directs the cantons to implement certain mandatory measures while other provisions are at the discretion of the canton. During the period ended December 31, 2019, the Company recorded a deferred tax asset and a partial valuation allowance for the cantonal and federal impact of the TRAF. The income tax impact of the TRAF may be subject to change due to the issuance of further legislative guidance from the Swiss taxing authorities. The Company’s net unrecognized tax benefits totaled $75.0 million and $84.5 million as of September 30, 2020 and December 31, 2019, respectively. At September 30, 2020, $63.0 million included in the balance for tax positions would affect the annual effective tax rate if recognized. The Company recognizes interest accrued related to uncertain tax positions and penalties in income tax expense. As of September 30, 2020, the Company has accrued $3.9 million for the payment of interest. The Company and one or more of its subsidiaries are subject to U.S. federal income taxes in the United States, as well as income taxes of multiple state and foreign jurisdictions. The Company is currently under examination by the United States Internal Revenue Service for the 2017 and 2018 tax years. With few exceptions, the Company is generally not subject to examination for state and local income tax, or in non-U.S. jurisdictions, by tax authorities for years prior to 2017. The Company's U.S. liquidity needs are currently satisfied using cash flows generated from its U.S. operations, borrowings, or both. The Company also utilizes a variety of tax planning strategies in an effort to ensure that its worldwide cash is available in locations in which it is needed. The Company expects to repatriate a substantial portion of its foreign earnings over time, to the extent that the foreign earnings are not restricted by local laws or result in significant incremental costs associated with repatriating the foreign earnings. At September 30, 2020, the Company had $393.9 million in net deferred tax assets. The authoritative guidance requires a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company reviews deferred tax assets periodically for recoverability and makes estimates and judgments regarding the expected geographic sources of taxable income and gains from investments, as well as tax planning strategies in assessing the need for a valuation allowance. If the estimates and assumptions used in the Company's determination change in the future, the Company could be required to revise its estimates of the valuation allowances against its deferred tax assets and adjust its provisions for additional income taxes. On March 27, 2020, the United States enacted the Coronavirus Aid, Relief & Economic Security (“CARES”) Act. The CARES Act includes a wide variety of tax and non-tax provisions aimed to provide relief to individuals and businesses adversely affected by the COVID-19 pandemic. This legislation includes an array of tax benefits and incentives for businesses, including in part, the deferral of payment of certain employer payroll taxes. Similarly, the Swiss government enacted a number of measures to help mitigate the negative effects of COVID-19 on the Swiss economy. The Company is evaluating the impact of global COVID-19-related laws and proposed laws, however, no material impact to the Company's financial results is expected as a result of legislation enacted to date. The Company will review any guidance issued in the future by applicable tax authorities and continue to evaluate the impact of any new developments or legislation.

Treasury Stock

Treasury Stock	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
TREASURY STOCK	TREASURY STOCK Stock Repurchase Program The Company’s Board of Directors has authorized an ongoing stock repurchase program, of which $1.00 billion was approved in January 2020. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At September 30, 2020, $714.1 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock. A portion of the funds used to repurchase stock over the course of the program was provided by net proceeds from the Convertible Notes, the 2027 Notes and the Term Loan Credit Agreement, as well as proceeds from employee stock awards and the related tax benefit. The Company is authorized to make purchases of its common stock using general corporate funds through open market purchases, pursuant to a Rule 10b5-1 plan or in privately negotiated transactions. On January 30, 2020, the Company used the proceeds from its Term Loan Credit Agreement and entered into ASR transactions with a group of Dealers for an aggregate of $1.00 billion. Under the ASR transactions, the Company received an initial share delivery of 6.5 million shares of its common stock, with the remainder delivered upon completion of the ASR transactions. The total number of shares of common stock that the Company repurchased under each ASR agreement was based on the average of the daily volume-weighted average prices of its common stock during the term of the applicable ASR agreement, less a discount. The Company received delivery of 0.8 million shares of its common stock in August 2020 in final settlement of the ASR Agreement. See Note 11 for detailed information on the Term Loan Credit Agreement. During the three months ended September 30, 2020, the Company made no open market purchases under the stock repurchase program. During the nine months ended September 30, 2020, the Company expended $199.9 million on open market purchases under the stock repurchase program, repurchasing 1,731,500 shares of common stock at an average price of $115.45. During the three months ended September 30, 2019, the Company expended $103.9 million on open market purchases under the stock repurchase program, repurchasing 1,130,100 shares of common stock at an average price of $91.94. During the nine months ended September 30, 2019, the Company expended $353.9 million on open market purchases under the stock repurchase program, repurchasing 3,640,982 shares of common stock at an average price of $97.20. Shares for Tax Withholding During the three and nine months ended September 30, 2020, the Company withheld 25,826 and 765,426 shares, respectively, from equity awards that vested, totaling $3.7 million and $104.8 million, respectively, to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. During the three and nine months ended September 30, 2019, the Company withheld 44,829 and 742,946 shares, respectively, from equity awards that vested, totaling $4.2 million and $74.8 million respectively, to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.

Commitments And Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal Matters The Company accrues a liability for legal contingencies when it believes that it is both probable that a liability has been incurred and that it can reasonably estimate the amount of the loss. The Company reviews these accruals and adjusts them to reflect ongoing negotiations, settlements, rulings, advice of legal counsel and other relevant information. To the extent new information is obtained and the Company's views on the probable outcomes of any pending claims, suits, assessments, regulatory investigations, or other legal proceedings change, changes in the Company's accrued liabilities would be recorded in the period in which such determination is made. In addition, in accordance with the relevant authoritative guidance, for matters in which the likelihood of material loss is at least reasonably possible, the Company provides disclosure of the possible loss or range of loss. If a reasonable estimate cannot be made, however, the Company will provide disclosure to that effect. Due to the nature of the Company's business, the Company is subject to patent infringement claims, including current litigati on alleging infringement by various Company solutions and services. The Company believes that it has meritorious defenses to the allegations made in its pending litigation and intends to vigorously defend itself; however, it is unable currently to determine the ultimate outcome of these or similar matters or the potential exposure to loss, if any. In addition, the Company is subject to various other legal proceedings, including suits, assessments, regulatory actions and investigations generally arising out of the normal course of business. Although it is difficult to predict the ultimate outcomes of these matters, the Company believes that outcomes that will materially and adversely affect its results of operations or cash flows are reasonably possible but not estimable at this time. On July 25, 2019, a class action lawsuit was filed against Citrix, LogMeIn, Inc. (“LogMeIn”) and certain of their current and former directors and officers in the Circuit Court of the 15th Judicial Circuit, Palm Beach County, Florida. The complaint alleges that the defendants violated federal securities laws by making alleged misstatements and omissions in LogMeIn’s Registration Statement and Prospectus filed in connection with the 2017 spin-off of Citrix’s GoTo family of service offerings and subsequent merger of that business with LogMeIn. The complaint seeks among other things the recovery of monetary damages. On April 28, 2020, the defendants filed motions to dismiss the complaint, which remain pending. The Company believes that Citrix and its current and former directors named as defendants have meritorious defenses to these allegations; however, the Company is unable to currently determine the ultimate outcome of this matter or the potential exposure or loss, if any. Guarantees The authoritative guidance requires certain guarantees to be recorded at fair value and requires a guarantor to make disclosures, even when the likelihood of making any payments under the guarantee is remote. For those guarantees and indemnifications that do not fall within the initial recognition and measurement requirements of the authoritative guidance, the Company must continue to monitor the conditions that are subject to the guarantees and indemnifications, as required under existing generally accepted accounting principles, to identify if a loss has been incurred. If the Company determines that it is probable that a loss has been incurred, any such estimable loss would be recognized. The initial recognition and measurement requirements do not apply to the provisions contained in the majority of the Company’s software license agreements that indemnify licensees of the Company’s software from damages and costs resulting from claims alleging that the Company’s software infringes the intellectual property rights of a third p arty. The Company has not made material payments pursuant to these provisions. The Company has not identified any losses that are probable under these provisions and, accordingly, the Company has not recorded a liability related to these indemnification provisions. Other Purchase Commitments In May 2020, the Company entered into an amended agreement with a third-party provider, in the ordinary course of business, for the use of certain cloud services through June 2029. Under the am ended agreement, the Company is committed to a purchase of $1.00 billion throughout the term of the agreement. As of September 30, 2020 , the Company had $969.8 million of remaining obligations under the purchase agreement.

Restructuring

Restructuring	9 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
RESTRUCTURING	RESTRUCTURING The Company has implemented multiple restructuring plans to reduce its cost structure, align resources with its product strategy and improve efficiency, which has resulted in workforce reductions and the consolidation of certain leased facilities. All of the activities related to these restructuring plans are substantially complete. For the three and nine months ended September 30, 2020 and 2019, restructuring charges were comprised of the following (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Employee severance and related costs $ — $ 6,213 $ 3,100 $ 13,356 Consolidation of leased facilities — 2,666 — 2,666 Right-of-use asset impairment — — 8,881 — Total Restructuring charges $ — $ 8,879 $ 11,981 $ 16,022 The Company reviews for impairment of long-lived assets, including right-of-use (“ROU”) assets, whenever events or changes in circumstances indicate that the carrying amount of such assets may be impaired. Measurement of an impairment loss is based on the fair value of the asset compared to its carrying value. The fair value of the ROU assets is determined by utilizing the present value of the estimated future cash flows attributable to the assets. During the nine months ended September 30, 2020, in connection with the COVID-19 pandemic, the Company determined that a vacant facility partially impaired under a previous restructuring plan became fully impaired due to a reassessment of the timing and fees of the assumed sublease rentals and recorded impairment charges of $8.9 million. This non-recurring fair value measurement was categorized as Level 3, as significant unobservable inputs were utilized. Restructuring accruals The activity in the Company’s restructuring accruals for the nine months ended September 30, 2020 is summarized as follows (in thousands): Total Balance at January 1, 2020 $ 6,957 Employee severance and related costs 3,100 Payments (8,492) Balance at September 30, 2020 $ 1,565

Statement of Changes in Equity

Statement of Changes in Equity	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Statement of Changes in Equity	STATEMENT OF CHANGES IN EQUITY The following tables presents the changes in total stockholders' (deficit) equity during the three and nine months ended September 30, 2020 (in thousands): Common Stock Additional Paid In Capital Retained Earnings Accumulated Other Comprehensive Loss Common Stock in Treasury Total (Deficit) Equity Shares Amount Shares Amount Balance at June 30, 2020 321,210 $ 321 $ 6,216,838 $ 4,863,515 $ (6,465) (197,693) $ (11,167,805) $ (93,596) Shares issued under stock-based compensation plans 109 — — — — — — — Stock-based compensation expense — — 85,169 — — — — 85,169 Common stock issued under employee stock purchase plan 238 1 23,599 — — — — 23,600 Restricted shares turned in for tax withholding — — — — — (26) (3,692) (3,692) Cash dividends declared — — — (43,046) — — — (43,046) Accelerated stock repurchase program — — 200,000 — — (849) (200,000) — Other — — 1,756 (1,756) — — — — Other comprehensive income, net of tax — — — — 2,138 — — 2,138 Net income — — — 98,227 — — — 98,227 Balance at September 30, 2020 321,557 $ 322 $ 6,527,362 $ 4,916,940 $ (4,327) (198,568) $ (11,371,497) $ 68,800 Common Stock Additional Retained Accumulated Other Common Stock Total Equity Shares Amount Shares Amount Balance at December 31, 2019 318,760 $ 319 $ 6,249,065 $ 4,660,145 $ (5,127) (188,693) $ (10,066,746) $ 837,656 Shares issued under stock-based compensation plans 2,314 2 (2) — — — — — Stock-based compensation expense — — 228,854 — — — — 228,854 Common stock issued under employee stock purchase plan 483 1 44,634 — — — — 44,635 Stock repurchases, net — — — — — (1,732) (199,903) (199,903) Restricted shares turned in for tax withholding — — — — — (765) (104,848) (104,848) Cash dividends declared — — — (129,108) — — — (129,108) Accelerated stock repurchase program — — — — — (7,378) (1,000,000) (1,000,000) Cumulative-effect adjustment from adoption of accounting standard — — — (1,641) — — — (1,641) Other — — 4,811 (4,811) — — — — Other comprehensive income, net of tax — — — — 800 — — 800 Net income — — — 392,355 — — — 392,355 Balance at September 30, 2020 321,557 $ 322 $ 6,527,362 $ 4,916,940 $ (4,327) (198,568) $ (11,371,497) $ 68,800 The following tables presents the changes in total stockholders' equity during the three and nine months ended September 30, 2019 (in thousands): Common Stock Additional Paid In Capital Retained Earnings Accumulated Other Comprehensive Loss Common Stock in Treasury Total Equity Shares Amount Shares Amount Balance at June 30, 2019 316,969 $ 317 $ 6,078,960 $ 4,277,586 $ (4,610) (186,486) $ (9,844,231) $ 508,022 Shares issued under stock-based compensation plans 123 — — — — — — — Stock-based compensation expense — — 68,969 — — — — 68,969 Common stock issued under employee stock purchase plan 255 1 20,454 — — — — 20,455 Stock repurchases, net — — — — — (1,130) (103,905) (103,905) Restricted shares turned in for tax withholding — — — — — (45) (4,242) (4,242) Cash dividends declared — — — (45,373) — — — (45,373) Settlement of warrants 202 — — — — — — — Other — — 2,194 (2,194) — — — — Other comprehensive loss, net of tax — — — — (1,872) — — (1,872) Net income — — — 270,857 — — — 270,857 Balance at September 30, 2019 317,549 $ 318 $ 6,170,577 $ 4,500,876 $ (6,482) (187,661) $ (9,952,378) $ 712,911 Common Stock Additional Retained Accumulated Other Common Stock Total Shares Amount Shares Amount Balance at December 31, 2018 309,761 $ 310 $ 5,404,500 $ 4,169,019 $ (8,154) (178,327) $ (9,014,156) $ 551,519 Shares issued under stock-based compensation plans 2,167 2 (2) — — — — — Stock-based compensation expense — — 202,523 — — — — 202,523 Temporary equity reclassification — — 8,110 — — — — 8,110 Common stock issued under employee stock purchase plan 471 1 39,470 — — — — 39,471 Stock repurchases, net — — — — — (3,641) (353,904) (353,904) Restricted shares turned in for tax withholding — — — — — (743) (74,794) (74,794) Cash dividends declared — — — (137,224) — — — (137,224) Settlement of convertible notes and hedges 4,950 5 509,519 — — (4,950) (509,524) — Settlement of warrants 202 — — — — — — — Cumulative-effect adjustment from adoption of accounting standard — — — 838 — — — 838 Other (2) — 6,457 (6,457) — — — — Other comprehensive income, net of tax — — — — 1,672 — — 1,672 Net income — — — 474,700 — — — 474,700 Balance at September 30, 2019 317,549 $ 318 $ 6,170,577 $ 4,500,876 $ (6,482) (187,661) $ (9,952,378) $ 712,911 Cash Dividend The following table provides information with respect to quarterly dividends on common stock during the nine months ended September 30, 2020. Declaration Date Dividends per Share Record Date Payable Date January 22, 2020 $ 0.35 March 6, 2020 March 20, 2020 April 23, 2020 $ 0.35 June 5, 2020 June 19, 2020 July 23, 2020 $ 0.35 September 11, 2020 September 25, 2020 Subsequent Event On October 22, 2020, the Company announced that its Board of Directors approved a quarterly cash dividend of $0.35 per share which will be paid on December 22, 2020 to all shareholders of record as of the close of business on December 8, 2020.

Significant Accounting Polici_2

Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Current Expected Credit Losses In June 2016, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update on the measurement of credit losses on financial instruments. Previously, credit losses were measured using an incurred loss approach when it was probable that a credit loss had been incurred. The new guidance changes the credit loss model from an incurred loss to an expected loss approach. It requires the application of a current expected credit loss (“CECL”) impairment model to financial assets measured at amortized cost (including trade accounts receivable) and certain off-balance-sheet credit exposures. Under the CECL model, lifetime expected credit losses on such financial assets are measured and recognized at each reporting date based on historical, current, and forecasted information. The standard also changes the impairment model for available-for-sale debt securities, eliminating the concept of other than temporary impairment and requiring credit losses to be recorded through an allowance for credit losses. The amount of the allowance for credit losses for available-for-sale debt securities is limited to the amount by which fair value is below amortized cost. The Company adopted this standard as of January 1, 2020 using the required modified retrospective adoption method. Results for periods beginning after January 1, 2020 are presented under the new guidance, while prior period amounts are not adjusted and continue to be reported under the previous accounting guidance. Adoption of the new standard did not have a material impact on the Company's condensed consolidated financial position, results of operations and cash flows. See Note 5 for additional information regarding the Company’s allowance for credit losses. Fair Value Measurements In August 2018, the FASB issued an accounting standard update on fair value measurements. The new guidance modifies the disclosure requirements on fair value measurements by removing certain disclosure requirements related to the fair value hierarchy, modifying existing disclosure requirements related to measurement uncertainty, and adding new disclosure requirements. The Company adopted this standard as of January 1, 2020, and it did not have a material impact on the Company's condensed consolidated financial position, results of operations and cash flows. Income Taxes In December 2019, the FASB issued an accounting standard update on income taxes. The new guidance eliminates certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. It also clarifies and simplifies other aspects of the accounting for income taxes. The new standard will be effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years, and early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial position, results of operations and cash flows. Facilitation of the Effects of Reference Rate Reform on Financial Reporting
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Significant estimates made by management include estimation for reserves for legal contingencies, the standalone selling price related to revenue recognition, the provision for credit losses related to accounts receivable, contract assets, and available-for-sale debt securities, the provision to reduce obsolete or excess inventory to market, the provision for estimated returns, as well as sales allowances, the assumptions used in the valuation of stock-based awards and measurement of expense related to performance stock units, the assumptions used in the discounted cash flows to mark certain of its investments to market, the valuation of the Company’s goodwill, net realizable value of product related and other intangible assets, the provision for income taxes, valuation allowance for deferred tax assets, uncertain tax positions, and the amortization and depreciation periods for contract acquisition costs, intangible and long-lived assets. While the Company believes that such estimates are fair when considered in conjunction with the condensed consolidated financial position and results of operations taken as a whole, the actual amounts of such items, when known, will vary from these estimates.
Available-for-sale Investments	Available-for-sale Investments Short-term and long-term available-for-sale investments in debt securities as of September 30, 2020 and December 31, 2019 primarily consist of agency securities, corporate securities and government securities. Investments classified as available-for-sale debt securities are stated at fair value, with unrealized gains and losses, net of taxes, reported in Accumulated other comprehensive loss. The Company classifies its available-for-sale investments as current and non-current based on their actual remaining time to maturity. The Company does not recognize unrealized changes in the fair value of its available-for-sale debt securities in income unless a security is deemed to be impaired. The Company’s investment policy is designed to limit exposure to any one issuer depending on credit quality. The Company uses information provided by third parties to adjust the carrying value of certain of its investments to fair value at the end of each period. Fair values are based on a variety of inputs and may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes. See Note 6 for additional information regarding the Company’s investments.
Foreign Currency	Foreign Currency The functional currency for all of the Company’s wholly-owned foreign subsidiaries is the U.S. dollar. Monetary assets and liabilities of such subsidiaries are remeasured into U.S. dollars at exchange rates in effect at the balance sheet date, and revenues and expenses are remeasured at average rates prevailing during the year.
Accounting for Stock-Based Compensation Plans	Accounting for Stock-Based Compensation Plans The Company has various stock-based compensation plans for its employees and outside directors and accounts for stock-based compensation arrangements in accordance with the authoritative guidance, which requires the Company to measure and record compensation expense in its condensed consolidated financial statements using a fair value method. See Note 8 for further information regarding the Company’s stock-based compensation plans.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Summary of Performance Obligations	The Company’s typical performance obligations include the following: Performance Obligation When Performance Obligation is Typically Satisfied Subscription Cloud-hosted offerings Over the contract term, beginning on the date that service is made available to the customer (over time) CSP As the usage occurs (over time) On-premise subscription software licenses When software activation keys have been made available for download (point in time) Product and license Software licenses When software activation keys have been made available for download (point in time) Hardware When control of the product passes to the customer; typically upon shipment (point in time) Support and services License updates and maintenance Ratably over the course of the service term (over time) Professional services As the services are provided (over time)
Disaggregation of Revenue	Timing of revenue recognition Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 (In thousands) Products and services transferred at a point in time $ 155,087 $ 159,326 $ 630,193 $ 500,450 Products and services transferred over time 612,083 573,575 1,796,851 1,700,291 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction	The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period (in thousands): <1-3 years 3-5 years 5 years or more Total Subscription $ 1,165,198 $ 76,272 $ 909 $ 1,242,379 Support and services 1,334,259 30,214 1,559 1,366,032 Total net revenues $ 2,499,457 $ 106,486 $ 2,468 $ 2,608,411

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Income Per Share Basic And Diluted	The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share information): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Numerator: Net income $ 98,227 $ 270,857 $ 392,355 $ 474,700 Denominator: Denominator for basic earnings per share - weighted-average shares outstanding 123,255 130,277 123,835 131,020 Effect of dilutive employee stock awards 2,608 1,823 2,572 2,050 Effect of dilutive Convertible Notes — — — 1,901 Effect of dilutive warrants — 555 — 1,326 Denominator for diluted earnings per share - weighted-average shares outstanding 125,863 132,655 126,407 136,297 Basic earnings per share $ 0.80 $ 2.08 $ 3.17 $ 3.62 Diluted earnings per share $ 0.78 $ 2.04 $ 3.10 $ 3.48

Credit Losses (Tables)

Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2020
Credit Loss [Abstract]
Schedule of Accounts Receivable, Net	The Company's accounts receivable, which are typically due within one year, consist of the following (in thousands): September 30, 2020 Accounts receivable, gross $ 580,425 Less: allowance for returns (3,634) Less: allowance for credit losses (12,009) Accounts receivable, net $ 564,782
Activity in the Allowance for Credit Losses	The activity in the Company's allowance for credit losses for the nine months ended September 30, 2020 is summarized as follows (in thousands): Total Balance of allowance for credit losses at January 1, 2020 $ 6,161 Adjustment for ASC 326 adoption 1,245 Current period provision for expected losses 5,884 Write-offs charged against allowance (1,349) Recoveries of any amounts previously written off 68 Balance of allowance for credit losses at September 30, 2020 $ 12,009

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2020
Investments [Abstract]
Schedule of investments in available-for-sale securities at fair values	Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands): September 30, 2020 Description of the Securities Amortized Gross Gross Allowance Fair Value Agency securities $ 39,993 $ 2 $ — $ — $ 39,995 Corporate securities 197,239 4 (12) (147) 197,084 Government securities 132,475 1 (7) — 132,469 Total $ 369,707 $ 7 $ (19) $ (147) $ 369,548 December 31, 2019 Description of the Securities Amortized Gross Gross Fair Value Agency securities $ 1,681 $ 1 $ — $ 1,682 Corporate securities 49,027 6 (149) 48,884 Government securities 9,124 5 — 9,129 Total $ 59,832 $ 12 $ (149) $ 59,695

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Assets And Liabilities Measured At Fair Value On A Recurring Basis	Assets and Liabilities Measured at Fair Value on a Recurring Basis As of September 30, 2020 Quoted Significant Significant (In thousands) Assets: Cash and cash equivalents: Cash $ 548,220 $ 548,220 $ — $ — Money market funds 8,264 8,264 — — Corporate securities 2,342 — 2,342 — Government securities 9,998 — 9,998 — Available-for-sale securities: Agency securities 39,995 — 39,995 — Corporate securities 197,084 — 196,584 500 Government securities 132,469 — 132,469 — Prepaid expenses and other current assets: Foreign currency derivatives 2,165 — 2,165 — Total assets $ 940,537 $ 556,484 $ 383,553 $ 500 Accrued expenses and other current liabilities: Foreign currency derivatives 6,069 — 6,069 — Total liabilities $ 6,069 $ — $ 6,069 $ — As of December 31, 2019 Quoted Significant Significant (In thousands) Assets: Cash and cash equivalents: Cash $ 474,756 $ 474,756 $ — $ — Money market funds 42,019 42,019 — — Agency securities 19,993 — 19,993 — Corporate securities 8,993 — 8,993 — Available-for-sale securities: Agency securities 1,682 — 1,682 — Corporate securities 48,884 — 47,884 1,000 Government securities 9,129 — 9,129 — Prepaid expenses and other current assets: Foreign currency derivatives 1,889 — 1,889 — Total assets $ 607,345 $ 516,775 $ 89,570 $ 1,000 Accrued expenses and other current liabilities: Foreign currency derivatives 1,390 — 1,390 — Total liabilities $ 1,390 $ — $ 1,390 $ —
Fair Value, by Balance Sheet Grouping	As of September 30, 2020, the fair value of the $750.0 million unsecured senior notes due March 1, 2030 (the "2030 Notes") and $750.0 million unsecured senior notes due December 1, 2027 (the “2027 Notes") was determined based on inputs that are observable in the market (Level 2). Based on the closing trading price per $100 as of the last day of trading for the quarter ended September 30, 2020, the carrying value was as follows (in thousands): Fair Value Carrying Value 2030 Notes $ 798,443 $ 738,811 2027 Notes $ 862,103 $ 743,593

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions	The Company used the Black-Scholes model to estimate the fair value of the ESPP awards with the following weighted-average assumptions: Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Expected volatility factor 0.21 - 0.35 0.22 - 0.29 0.21 - 0.35 0.22 - 0.29 Risk free interest rate 0.13% - 1.56% 2.06% - 2.49% 0.13% - 2.06% 2.06% - 2.49% Expected dividend yield 0.92% - 1.20% 1.31% - 1.39% 0.92% - 1.39% 1.27% - 1.39% Expected life (in years) 0.5 0.5 0.5 0.5
Schedule of Total Stock-based Compensation Recognized by Income Statement Classification	The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, Income Statement Classifications 2020 2019 2020 2019 Cost of subscription, support and services $ 3,542 $ 2,898 $ 9,708 $ 8,056 Research and development 28,803 25,505 81,386 78,761 Sales, marketing and services 28,411 23,838 76,640 68,188 General and administrative 24,413 16,728 61,120 47,518 Total $ 85,169 $ 68,969 $ 228,854 $ 202,523

Goodwill And Other Intangible_2

Goodwill And Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Intangible Assets	Intangible assets consist of the following (in thousands): September 30, 2020 December 31, 2019 Gross Carrying Accumulated Gross Carrying Accumulated Product related intangible assets $ 740,593 $ 658,509 $ 734,973 $ 633,633 Other 187,173 182,133 187,173 180,035 Total $ 927,766 $ 840,642 $ 922,146 $ 813,668
Schedule Of Estimated Future Amortization Expense	Estimated future amortization expense of intangible assets with finite lives as of September 30, 2020 is as follows (in thousands): Year ending December 31, 2020 (remaining three months) $ 8,569 2021 23,590 2022 21,391 2023 17,124 2024 6,090 Thereafter 10,360 Total $ 87,124

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Revenues by Product Grouping	Revenues by product grouping were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Net revenues: Workspace (1) $ 573,342 $ 512,838 $ 1,811,936 $ 1,562,508 Networking (2) 166,166 188,191 532,169 537,628 Professional services (3) 27,662 31,872 82,939 100,605 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741 (1) Workspace revenues are primarily comprised of sales from the Company’s application virtualization solutions, which include Citrix Workspace, Citrix Virtual Apps and Desktops, the Company's unified endpoint management solutions, which include Citrix Endpoint Management and Citrix Content Collaboration. (2) Networking revenues primarily include Citrix ADC and Citrix SD-WAN. Beginning in the fourth quarter of 2020, the Company is renaming its Networking product grouping to App Delivery and Security to better align with industry categorization of its solutions. (3) Professional services revenues are comprised of revenues from consulting services primarily related to the Company's perpetual offerings and product training and certification services.
Revenues by Geographic Location	The following table presents revenues by geographic location, for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Net revenues: Americas $ 414,341 $ 418,301 $ 1,330,666 $ 1,251,729 EMEA 276,494 236,081 847,454 713,282 APJ 76,335 78,519 248,924 235,730 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741
Schedule of Revenue by Major Customers	The Company defines Strategic Service Providers (SSP) as its three historically largest hyperscale Networking customers. The following table summarizes SSP revenue for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Net revenues: SSP revenue $ 21,589 $ 38,475 $ 71,091 $ 84,307 Non-SSP revenue 745,581 694,426 2,355,953 2,116,434 Total net revenues $ 767,170 $ 732,901 $ 2,427,044 $ 2,200,741
Schedule of Subscription Revenues	The following table presents subscription revenues by SaaS and non-SaaS components, for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Subscription: SaaS $ 137,831 $ 100,857 $ 391,019 $ 277,512 Non-SaaS 124,773 59,016 383,271 179,800 Total Subscription revenue $ 262,604 $ 159,873 $ 774,290 $ 457,312

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Components of Long-term Debt	The components of the Company's long-term debt were as follows (in thousands): September 30, 2020 December 31, 2019 Term Loan Credit Agreement $ 250,000 $ — 2027 Senior Notes 750,000 750,000 2030 Senior Notes 750,000 — Total face value 1,750,000 750,000 Less: unamortized discount (5,755) (1,291) Less: unamortized issuance costs (12,176) (5,783) Total long-term debt $ 1,732,069 $ 742,926
Schedule of Interest Expense Recognized Related to Convertible Notes	The following table includes total interest expense recognized related to the Term Loan Credit Agreement, the 2030 Notes, the 2027 Notes and the Convertible Notes (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2020 2019 2020 2019 Contractual interest expense $ 15,918 $ 8,438 $ 45,734 $ 26,945 Amortization of debt issuance costs 393 182 1,780 1,488 Amortization of debt discount 161 41 410 8,232 $ 16,472 $ 8,661 $ 47,924 $ 36,665

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of The Fair Values Of Derivative Instruments	Fair Values of Derivative Instruments Asset Derivatives Liability Derivatives (In thousands) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Derivatives Designated as Hedging Instruments Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Foreign currency forward contracts Prepaid $2,112 Prepaid $1,335 Accrued $429 Accrued $371 Asset Derivatives Liability Derivatives (In thousands) September 30, 2020 December 31, 2019 September 30, 2020 December 31, 2019 Derivatives Not Designated as Hedging Instruments Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Balance Sheet Fair Foreign currency forward contracts Prepaid $53 Prepaid $554 Accrued $5,640 Accrued $1,019
Schedule Of Effect Of Derivative Instruments On Financial Performance	The Effect of Derivative Instruments on Financial Performance For the Three Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Location of (Loss) Gain Reclassified Amount of (Loss) Gain Reclassified from Accumulated Other 2020 2019 2020 2019 Foreign currency forward contracts $ 2,123 $ (1,936) Operating expenses $ (390) $ 162 For the Nine Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other 2020 2019 2020 2019 Foreign currency forward contracts $ 667 $ (610) Operating expenses $ (1,061) $ (829) For the Three Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Amount of (Loss) Gain Recognized 2020 2019 Foreign currency forward contracts Other income, net $ (7,407) $ 4,108 For the Nine Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Amount of (Loss) Gain Recognized 2020 2019 Foreign currency forward contracts Other income, net $ (4,878) $ 2,128
Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding	As of September 30, 2020, the Company had the following net notional foreign currency forward contracts outstanding (in thousands): Foreign Currency Currency Australian Dollar AUD 30,400 Brazilian Real BRL 2,800 Pounds Sterling GBP 5,200 Canadian Dollar CAD 350 Chinese Yuan Renminbi CNY 35,600 Czech Koruna CZK 2,900 Danish Krone DKK 5,650 Euro EUR 164 Hong Kong Dollar HKD 11,400 Indian Rupee INR 456,000 Japanese Yen JPY 171,000 Korean Won KRW 3,073,000 Singapore Dollar SGD 12,300 Swiss Franc CHF 167,055

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of changes in accumulated other comprehensive income by component	The changes in Accumulated other comprehensive loss by component, net of tax, are as follows: Foreign currency Unrealized loss on available-for-sale securities Unrealized gain on derivative instruments Other comprehensive loss on pension liability Total (In thousands) Balance at December 31, 2019 $ (2,946) $ (139) $ 868 $ (2,910) $ (5,127) Other comprehensive income (loss) before reclassifications — 145 (394) 8 (241) Amounts reclassified from accumulated other comprehensive loss — (20) 1,061 — 1,041 Net current period other comprehensive income — 125 667 8 800 Balance at September 30, 2020 $ (2,946) $ (14) $ 1,535 $ (2,902) $ (4,327)
Schedule of reclassification out of accumulated other comprehensive income	Reclassifications out of Accumulated other comprehensive loss are as follows: For the Three Months Ended September 30, 2020 (In thousands) Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss, net of tax Affected line item in the Condensed Consolidated Statements of Income Unrealized net losses on available-for-sale securities $ 1 Other income, net Unrealized net losses on cash flow hedges 390 Operating expenses * $ 391 For the Nine Months Ended September 30, 2020 (In thousands) Details about accumulated other comprehensive loss components Amount reclassified from accumulated other comprehensive loss, net of tax Affected line item in the Condensed Consolidated Statements of Income Unrealized net gains on available-for-sale securities $ (20) Other income, net Unrealized net losses on cash flow hedges 1,061 Operating expenses * $ 1,041

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Charges	For the three and nine months ended September 30, 2020 and 2019, restructuring charges were comprised of the following (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2020 2019 2020 2019 Employee severance and related costs $ — $ 6,213 $ 3,100 $ 13,356 Consolidation of leased facilities — 2,666 — 2,666 Right-of-use asset impairment — — 8,881 — Total Restructuring charges $ — $ 8,879 $ 11,981 $ 16,022
Schedule of Restructuring Accruals	The activity in the Company’s restructuring accruals for the nine months ended September 30, 2020 is summarized as follows (in thousands): Total Balance at January 1, 2020 $ 6,957 Employee severance and related costs 3,100 Payments (8,492) Balance at September 30, 2020 $ 1,565

Statement of Changes in Equity

Statement of Changes in Equity (Tables)	9 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Schedule of Stockholders Equity	The following tables presents the changes in total stockholders' (deficit) equity during the three and nine months ended September 30, 2020 (in thousands): Common Stock Additional Paid In Capital Retained Earnings Accumulated Other Comprehensive Loss Common Stock in Treasury Total (Deficit) Equity Shares Amount Shares Amount Balance at June 30, 2020 321,210 $ 321 $ 6,216,838 $ 4,863,515 $ (6,465) (197,693) $ (11,167,805) $ (93,596) Shares issued under stock-based compensation plans 109 — — — — — — — Stock-based compensation expense — — 85,169 — — — — 85,169 Common stock issued under employee stock purchase plan 238 1 23,599 — — — — 23,600 Restricted shares turned in for tax withholding — — — — — (26) (3,692) (3,692) Cash dividends declared — — — (43,046) — — — (43,046) Accelerated stock repurchase program — — 200,000 — — (849) (200,000) — Other — — 1,756 (1,756) — — — — Other comprehensive income, net of tax — — — — 2,138 — — 2,138 Net income — — — 98,227 — — — 98,227 Balance at September 30, 2020 321,557 $ 322 $ 6,527,362 $ 4,916,940 $ (4,327) (198,568) $ (11,371,497) $ 68,800 Common Stock Additional Retained Accumulated Other Common Stock Total Equity Shares Amount Shares Amount Balance at December 31, 2019 318,760 $ 319 $ 6,249,065 $ 4,660,145 $ (5,127) (188,693) $ (10,066,746) $ 837,656 Shares issued under stock-based compensation plans 2,314 2 (2) — — — — — Stock-based compensation expense — — 228,854 — — — — 228,854 Common stock issued under employee stock purchase plan 483 1 44,634 — — — — 44,635 Stock repurchases, net — — — — — (1,732) (199,903) (199,903) Restricted shares turned in for tax withholding — — — — — (765) (104,848) (104,848) Cash dividends declared — — — (129,108) — — — (129,108) Accelerated stock repurchase program — — — — — (7,378) (1,000,000) (1,000,000) Cumulative-effect adjustment from adoption of accounting standard — — — (1,641) — — — (1,641) Other — — 4,811 (4,811) — — — — Other comprehensive income, net of tax — — — — 800 — — 800 Net income — — — 392,355 — — — 392,355 Balance at September 30, 2020 321,557 $ 322 $ 6,527,362 $ 4,916,940 $ (4,327) (198,568) $ (11,371,497) $ 68,800 The following tables presents the changes in total stockholders' equity during the three and nine months ended September 30, 2019 (in thousands): Common Stock Additional Paid In Capital Retained Earnings Accumulated Other Comprehensive Loss Common Stock in Treasury Total Equity Shares Amount Shares Amount Balance at June 30, 2019 316,969 $ 317 $ 6,078,960 $ 4,277,586 $ (4,610) (186,486) $ (9,844,231) $ 508,022 Shares issued under stock-based compensation plans 123 — — — — — — — Stock-based compensation expense — — 68,969 — — — — 68,969 Common stock issued under employee stock purchase plan 255 1 20,454 — — — — 20,455 Stock repurchases, net — — — — — (1,130) (103,905) (103,905) Restricted shares turned in for tax withholding — — — — — (45) (4,242) (4,242) Cash dividends declared — — — (45,373) — — — (45,373) Settlement of warrants 202 — — — — — — — Other — — 2,194 (2,194) — — — — Other comprehensive loss, net of tax — — — — (1,872) — — (1,872) Net income — — — 270,857 — — — 270,857 Balance at September 30, 2019 317,549 $ 318 $ 6,170,577 $ 4,500,876 $ (6,482) (187,661) $ (9,952,378) $ 712,911 Common Stock Additional Retained Accumulated Other Common Stock Total Shares Amount Shares Amount Balance at December 31, 2018 309,761 $ 310 $ 5,404,500 $ 4,169,019 $ (8,154) (178,327) $ (9,014,156) $ 551,519 Shares issued under stock-based compensation plans 2,167 2 (2) — — — — — Stock-based compensation expense — — 202,523 — — — — 202,523 Temporary equity reclassification — — 8,110 — — — — 8,110 Common stock issued under employee stock purchase plan 471 1 39,470 — — — — 39,471 Stock repurchases, net — — — — — (3,641) (353,904) (353,904) Restricted shares turned in for tax withholding — — — — — (743) (74,794) (74,794) Cash dividends declared — — — (137,224) — — — (137,224) Settlement of convertible notes and hedges 4,950 5 509,519 — — (4,950) (509,524) — Settlement of warrants 202 — — — — — — — Cumulative-effect adjustment from adoption of accounting standard — — — 838 — — — 838 Other (2) — 6,457 (6,457) — — — — Other comprehensive income, net of tax — — — — 1,672 — — 1,672 Net income — — — 474,700 — — — 474,700 Balance at September 30, 2019 317,549 $ 318 $ 6,170,577 $ 4,500,876 $ (6,482) (187,661) $ (9,952,378) $ 712,911
Quarterly Dividends on Common Stock	The following table provides information with respect to quarterly dividends on common stock during the nine months ended September 30, 2020. Declaration Date Dividends per Share Record Date Payable Date January 22, 2020 $ 0.35 March 6, 2020 March 20, 2020 April 23, 2020 $ 0.35 June 5, 2020 June 19, 2020 July 23, 2020 $ 0.35 September 11, 2020 September 25, 2020

Basis of Presentation (Details)

Basis of Presentation (Details)	9 Months Ended
	Sep. 30, 2020segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	1

Revenue (Details)

Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total net revenues	$ 767,170,000	$ 732,901,000	$ 2,427,044,000	$ 2,200,741,000
Short-term contract assets	22,100,000		22,100,000		$ 12,200,000
Long-term contract assets	29,500,000		29,500,000		20,500,000
Current portion of deferred revenues	1,313,883,000		1,313,883,000		1,352,333,000
Long-term portion of deferred revenues	378,421,000		378,421,000		443,458,000
Deferred revenue recognized	512,400,000		1,130,000,000
Impairment charges related to contract assets	0	0	0	0
Short-term contract acquisition costs	60,500,000		60,500,000		50,400,000
Long-term contract acquisition costs	99,800,000		99,800,000		$ 81,000,000
Impairment of capitalized costs	0	0	0	0
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	155,087,000	159,326,000	630,193,000	500,450,000
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Total net revenues	612,083,000	573,575,000	$ 1,796,851,000	1,700,291,000
Minimum [Member]
Disaggregation of Revenue [Line Items]
Average customer life			3 years
Maximum [Member]
Disaggregation of Revenue [Line Items]
Average customer life			7 years
Customer Relationships [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Average customer life			3 years
Customer Relationships [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Average customer life			5 years
Sales, Marketing and Services Expense [Member]
Disaggregation of Revenue [Line Items]
Amortization of capitalized contract acquisition costs	$ 14,700,000	$ 11,400,000	$ 41,600,000	$ 33,000,000

Revenue - Remaining Performance

Revenue - Remaining Performance Obligations (Details)	Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Subscription [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01 | Support and Services [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01 | Subscription [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01 | Support and Services [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Subscription [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 | Support and Services [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period

Revenue - Remaining Performan_2

Revenue - Remaining Performance Obligation Revenue (Details) $ in Thousands	Sep. 30, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 2,608,411
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	2,499,457
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	106,486
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	2,468
Subscription [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,242,379
Subscription [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,165,198
Subscription [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	76,272
Subscription [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	909
Support and Services [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,366,032
Support and Services [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	1,334,259
Support and Services [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	30,214
Support and Services [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 1,559

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Apr. 15, 2019	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted-average warrant strike price (in USD per share)		$ 94.18		$ 94.52
Numerator:
Net income	$ 98,227	$ 270,857	$ 392,355	$ 474,700
Denominator:
Denominator for basic net earnings per share - weighted-average shares outstanding (shares)	123,255,000	130,277,000	123,835,000	131,020,000
Effect of dilutive employee stock awards (shares)	2,608,000	1,823,000	2,572,000	2,050,000
Effect of dilutive Convertible Notes (shares)	0	0	0	1,901,000
Effect of dilutive warrants (shares)	0	555,000	0	1,326,000
Denominator for net diluted earnings per share - weighted-average shares outstanding (shares)	125,863,000	132,655,000	126,407,000	136,297,000
Basic earnings per share (in dollars per share)	$ 0.80	$ 2.08	$ 3.17	$ 3.62
Diluted earnings per share (in dollars per share)	$ 0.78	$ 2.04	$ 3.10	$ 3.48
Senior Notes Due 2019 [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stated interest rate percentage					0.50%	0.50%

Credit Losses - Accounts Receiv

Credit Losses - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Credit Loss [Abstract]
Accounts receivable, gross	$ 580,425
Less: allowance for returns	(3,634)
Less: allowance for credit losses	(12,009)
Accounts receivable, net	564,782	$ 720,359
Credit loss expense	$ 5,884

Credit Losses - Allowance for C

Credit Losses - Allowance for Credit Losses (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance of allowance for credit losses at January 1, 2020	$ 6,161
Adjustment for ASC 326 adoption	1,245
Current period provision for expected losses	5,884
Write-offs charged against allowance	(1,349)
Recoveries of any amounts previously written off	68
Balance of allowance for credit losses at September 30, 2020	$ 12,009

Credit Losses - Concentration R

Credit Losses - Concentration Risk (Details)	9 Months Ended
	Sep. 30, 2020
Arrow Group [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Percent of gross accounts receivable (percent)	19.00%

Credit Losses - AFS Investments

Credit Losses - AFS Investments (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Credit Loss [Abstract]
Available-for-sale investments, credit loss expense	$ 0	$ 0

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Investment Holdings [Line Items]
Average remaining maturities for short-term available for sale investments			3 months
Average remaining maturities for long-term available for sale investments			2 years
Proceeds from available-for-sale of investments	$ 0	$ 0	$ 0	$ 938
Available-for-sale investments not deemed to be other-than-temporarily impaired					$ 0.1
Unfunded commitments	0.5		0.5
Private Equity Funds [Member]
Investment Holdings [Line Items]
Alternative Investment	10.7		10.7		11.2
Other Income (Expense) [Member]
Investment Holdings [Line Items]
Realized losses on available-for-sale securities	0	0	0	0.9
Realized gains on sales of available-for-sale investments	0	$ 0	0	$ 1.5
Other Assets [Member]
Investment Holdings [Line Items]
Direct investments in privately-held companies	$ 12.3		$ 12.3		$ 12.3

Investments (Schedule of Availa

Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 369,707	$ 59,832
Gross Unrealized Gains	7	12
Gross Unrealized Losses	(19)	(149)
Allowance for Credit Losses	(147)
Fair Value	369,548	59,695
Agency securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,993	1,681
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0
Fair Value	39,995	1,682
Corporate securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	197,239	49,027
Gross Unrealized Gains	4	6
Gross Unrealized Losses	(12)	(149)
Allowance for Credit Losses	(147)
Fair Value	197,084	48,884
Government securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	132,475	9,124
Gross Unrealized Gains	1	5
Gross Unrealized Losses	(7)	0
Allowance for Credit Losses	0
Fair Value	$ 132,469	$ 9,129

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	$ 556,484	$ 516,775
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	383,553	89,570
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	6,069	1,390
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	500	1,000
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Cash and Cash Equivalents [Member] | Cash [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	548,220	474,756
Cash and Cash Equivalents [Member] | Cash [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Cash [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	8,264	42,019
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Corporate Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Corporate Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	2,342	8,993
Cash and Cash Equivalents [Member] | Corporate Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Government securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0
Cash and Cash Equivalents [Member] | Government securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	9,998
Cash and Cash Equivalents [Member] | Government securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0
Cash and Cash Equivalents [Member] | Agency Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		0
Cash and Cash Equivalents [Member] | Agency Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		19,993
Cash and Cash Equivalents [Member] | Agency Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		0
Available-for-sale Securities [Member] | Corporate Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Corporate Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	196,584	47,884
Available-for-sale Securities [Member] | Corporate Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	500	1,000
Available-for-sale Securities [Member] | Government securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Government securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	132,469	9,129
Available-for-sale Securities [Member] | Government securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Agency Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Agency Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	39,995	1,682
Available-for-sale Securities [Member] | Agency Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	0	0
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	2,165	1,889
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	0	0
Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	0	0
Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	6,069	1,390
Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	0	0
Estimate of Fair Value Measurement [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	940,537	607,345
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	6,069	1,390
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Cash [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	548,220	474,756
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	8,264	42,019
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Corporate Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	2,342	8,993
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	9,998
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Agency Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents		19,993
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Corporate Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	197,084	48,884
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	132,469	9,129
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Agency Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	39,995	1,682
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	2,165	1,889
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	$ 6,069	$ 1,390

Fair Value Measurements (Asse_2

Fair Value Measurements (Assets and Liabilities on a Nonrecurring Basis) (Details) - Nonrecurring [Member] - Level 3 [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount of direct investments in privately-held companies, impaired during the period	$ 5,000,000	$ 500,000	$ 6,300,000	$ 2,400,000
Fair value of direct investments in privately-held companies	4,600,000	100,000	4,600,000	400,000
Upward adjustment to one of the company's investments in a privately-held company	0	0	1,800,000	0
Other (Expense) Income, Net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charge	$ 400,000	$ 400,000	$ 1,700,000	$ 2,000,000

Fair Value Measurements (Additi

Fair Value Measurements (Additional Information Regarding Fair Value Measurements) (Details) - USD ($)	Sep. 30, 2020	Feb. 25, 2020	Dec. 31, 2019	Nov. 15, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	$ 1,732,069,000		$ 742,926,000
Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Closing trading price per $100 as of the last day of trading for the quarter	100
Unsecured Debt [Member] | 2030 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, face amount	750,000,000	$ 750,000,000
Unsecured Debt [Member] | 2027 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, face amount	750,000,000			$ 750,000,000
Senior Notes [Member] | 2030 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	738,811,000
Senior Notes [Member] | 2030 Notes [Member] | Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	798,443,000
Senior Notes [Member] | 2027 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Carrying Value	743,593,000
Senior Notes [Member] | 2027 Notes [Member] | Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 862,103,000

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) $ in Thousands	Apr. 06, 2020shares	Apr. 01, 2020shares	Sep. 30, 2020USD ($)planshares	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)installmentplanshares	Sep. 30, 2019USD ($)	Jun. 30, 2020shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered | plan			1		1
Stock-based compensation cost | $			$ 85,169	$ 68,969	$ 228,854	$ 202,523
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share period to determine actual stock grant following end of interim measurement period		60 days
Performance share earned share cap based on minimum shareholder return (percent)	125.00%	200.00%
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based awards granted and outstanding (shares)			5,748,376		5,748,376
Total unrecognized compensation cost related to stock-based compensation | $			$ 480,000		$ 480,000
Total unrecognized compensation cost recognition period					1 year 7 months 28 days
2014 Plan [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares per non-vested stock unit					1
Stock-based compensation award vesting period, number of monthly installments | installment					12
2014 Plan [Member] | Annual vesting on each anniversary [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage					33.33%
2015 ESPP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares)			16,000,000		16,000,000
Employee Stock Purchase Plan, total shares issued under plan (shares)			2,675,657		2,675,657
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $			$ 4,200	$ 4,000	$ 8,800	$ 9,500
Common Stock [Member] | 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan (shares)							51,300,000
Shares reserved for issuance under the stock-based compensation plans (shares)			18,516,165		18,516,165
Shares available for grant under the 2014 Plan (shares)			12,718,506		12,718,506
Senior Level Employees [Member] | Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)	90,756	294,605

Stock-Based Compensation (Assum

Stock-Based Compensation (Assumptions Used To Value Option Grants, Stock Awards and ESPP Shares) (Details) - 2015 ESPP Plan [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected life (in years)	6 months	6 months	6 months	6 months
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor	21.00%	22.00%	21.00%	22.00%
Risk free interest rate	0.13%	2.06%	0.13%	2.06%
Expected dividend yield	0.92%	1.31%	0.92%	1.27%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor	35.00%	29.00%	35.00%	29.00%
Risk free interest rate	1.56%	2.49%	2.06%	2.49%
Expected dividend yield	1.20%	1.39%	1.39%	1.39%

Stock-Based Compensation (Detai

Stock-Based Compensation (Detail Of The Total Stock-Based Compensation Recognized By Income Statement Classification) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 85,169	$ 68,969	$ 228,854	$ 202,523
Cost of subscription, support and services revenues [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	3,542	2,898	9,708	8,056
Research and development [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	28,803	25,505	81,386	78,761
Sales, marketing and services [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	28,411	23,838	76,640	68,188
General and administrative [Member]
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 24,413	$ 16,728	$ 61,120	$ 47,518

Goodwill And Other Intangible_3

Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) - USD ($)	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of goodwill and intangible assets	$ 0
Goodwill	$ 1,798,408,000	$ 1,798,408,000

Goodwill And Other Intangible_4

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Intangible Assets [Abstract]
Gross carrying amount	$ 927,766		$ 927,766		$ 922,146
Accumulated amortization	840,642		840,642		813,668
Non-cash impairment of intangible assets		$ 13,200
Fair value of definite-lived intangible assets	87,124	4,100	87,124	$ 4,100
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	740,593		740,593		734,973
Accumulated amortization	658,509		658,509		633,633
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	187,173		187,173		187,173
Accumulated amortization	182,133		$ 182,133		$ 180,035
Minimum [Member]
Statement [Line Items]
Intangible asset life			3 years
Minimum [Member] | Patents [Member]
Statement [Line Items]
Intangible asset life			7 years
Maximum [Member]
Statement [Line Items]
Intangible asset life			7 years
Maximum [Member] | Patents [Member]
Statement [Line Items]
Intangible asset life			10 years
Cost of net revenues [Member] | Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Amortization expense	8,300	22,600	$ 24,900	42,700
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 700	$ 4,900	$ 2,100	$ 11,700

Goodwill And Other Intangible_5

Goodwill And Other Intangible Assets (Schedule Of Estimated Future Amortization Expense) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2020 (remaining three months)	$ 8,569
2021	23,590
2022	21,391
2023	17,124
2024	6,090
Thereafter	10,360
Total	$ 87,124	$ 4,100

Segment Information (Additional

Segment Information (Additional Information) (Details)	9 Months Ended
	Sep. 30, 2020segmentcustomer
Concentration Risk [Line Items]
Number of reportable segments | segment	1
Strategic Service Provider [Member]
Concentration Risk [Line Items]
Number of significant customers | customer	3

Segment Information (Revenues B

Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 767,170	$ 732,901	$ 2,427,044	$ 2,200,741
Workspace [Member]
Segment Reporting Information [Line Items]
Revenue	573,342	512,838	1,811,936	1,562,508
Networking [Member]
Segment Reporting Information [Line Items]
Revenue	166,166	188,191	532,169	537,628
Professional Services [Member]
Segment Reporting Information [Line Items]
Revenue	$ 27,662	$ 31,872	$ 82,939	$ 100,605

Segment Information (Revenues_2

Segment Information (Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 767,170	$ 732,901	$ 2,427,044	$ 2,200,741
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	414,341	418,301	1,330,666	1,251,729
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	276,494	236,081	847,454	713,282
APJ [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 76,335	$ 78,519	$ 248,924	$ 235,730

Segment Information (Revenue by

Segment Information (Revenue by Customer Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue, Major Customer [Line Items]
Revenue	$ 767,170	$ 732,901	$ 2,427,044	$ 2,200,741
Strategic Service Provider [Member]
Revenue, Major Customer [Line Items]
Revenue	21,589	38,475	71,091	84,307
Non-strategic Service Provider [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 745,581	$ 694,426	$ 2,355,953	$ 2,116,434

Segment Information (Subscripti

Segment Information (Subscription Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total Subscription revenue	$ 767,170	$ 732,901	$ 2,427,044	$ 2,200,741
Subscription [Member]
Segment Reporting Information [Line Items]
Total Subscription revenue	262,604	159,873	774,290	457,312
Subscription, SaaS [Member]
Segment Reporting Information [Line Items]
Total Subscription revenue	137,831	100,857	391,019	277,512
Subscription, Non-SaaS [Member]
Segment Reporting Information [Line Items]
Total Subscription revenue	$ 124,773	$ 59,016	$ 383,271	$ 179,800

Debt (Components of Long-term D

Debt (Components of Long-term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total face value	$ 1,750,000	$ 750,000
Less: unamortized discount	(5,755)	(1,291)
Less: unamortized issuance costs	(12,176)	(5,783)
Total long-term debt	1,732,069	742,926
2027 Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	750,000
2030 Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	0
2020 Credit Agreement [Member] | 3-year Term Loan Facility [Member]
Debt Instrument [Line Items]
Total face value	250,000	$ 0
Total long-term debt	$ 250,000

Debt (Narrative) (Details)

Debt (Narrative) (Details)

Feb. 25, 2020USD ($)

Jan. 30, 2020USD ($)

Jan. 21, 2020USD ($)quarter

Nov. 26, 2019USD ($)

Apr. 15, 2019USD ($)shares

Nov. 15, 2017USD ($)

Jan. 31, 2017shares

Sep. 30, 2019USD ($)$ / sharesshares

Sep. 30, 2020USD ($)shares

Sep. 30, 2019USD ($)$ / shares

Dec. 31, 2014USD ($)shares

Dec. 31, 2019USD ($)

Debt Instrument [Line Items]

Proceeds from term loan credit agreement

$ 0

$ 200,000,000

Amount expended on share repurchases in open market transactions

$ 103,905,000

199,903,000

353,904,000

Term loan outstanding

1,732,069,000

$ 742,926,000

Proceeds from 2030 Notes, net of issuance costs

$ 738,107,000

$ 0

Warrants outstanding (shares) | shares

0

Bond hedges (in shares) | shares

16,000,000

Warrant transaction (shares) | shares

16,000,000

Adjustment to number of shares of common stock covered by note hedges and warrant transactions (shares) | shares

20,000,000

Warrant strike price (in USD per share) | $ / shares

$ 93.92

$ 93.92

Shares of common stock covered by warrant transactions (shares) | shares

11,900,000

Warrants exercised (shares) | shares

7,000,000

Shares issued upon exercise of warrants (shares) | shares

200,000

ASR Counterparty [Member]

Debt Instrument [Line Items]

Amount expended on share repurchases in open market transactions

$ 1,000,000,000

Senior Notes Due 2019 [Member]

Debt Instrument [Line Items]

Stated interest rate percentage

0.50%

0.50%

Convertible debt

$ 1,440,000,000

Debt repaid

$ 1,160,000,000

Shares issued upon conversion of debt (shares) | shares

4,900,000

Unsecured Debt [Member] | 2027 Notes [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 750,000,000

$ 750,000,000

Stated interest rate percentage

4.50%

Unsecured Debt [Member] | 2030 Notes [Member]

Debt Instrument [Line Items]

Debt instrument, face amount

$ 750,000,000

750,000,000

Stated interest rate percentage

3.30%

Proceeds from 2030 Notes, net of issuance costs

$ 738,100,000

Line of Credit [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 250,000,000

Debt instrument, term

5 years

Additional borrowing capacity

$ 250,000,000

Amount outstanding

0

$ 0

Prior to September 1, 2027 [Member] | Unsecured Debt [Member] | 2027 Notes [Member]

Debt Instrument [Line Items]

Redemption price as percent of aggregate principle amount (percent)

100.00%

Prior to March 1, 2030 [Member] | Unsecured Debt [Member] | 2030 Notes [Member]

Debt Instrument [Line Items]

Redemption price as percent of aggregate principle amount (percent)

100.00%

On or After December 1, 2029 [Member] | Unsecured Debt [Member] | 2030 Notes [Member]

Debt Instrument [Line Items]

Redemption price as percent of aggregate principle amount (percent)

100.00%

Upon Change of Control Prior to Maturity [Member] | Unsecured Debt [Member] | 2027 Notes [Member]

Debt Instrument [Line Items]

Redemption price as percent of aggregate principle amount (percent)

101.00%

Upon Change of Control Prior to Maturity [Member] | Unsecured Debt [Member] | 2030 Notes [Member]

Debt Instrument [Line Items]

Redemption price as percent of aggregate principle amount (percent)

101.00%

Letter of Credit [Member] | Line of Credit [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

25,000,000

Swing Line Loans [Member] | Line of Credit [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 10,000,000

2020 Credit Agreement [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 1,000,000,000

Proceeds from term loan credit agreement

$ 1,000,000,000

Consolidated leverage ratio (not more than)

3.5

Optional step-up consolidated leverage ratio

4

Number of fiscal quarters following a qualified acquisition | quarter

4

Consolidated interest coverage ratio

3

2020 Credit Agreement [Member] | 364-day Term Loan Facility [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 500,000,000

Debt instrument, term

364 days

Repayment of term loan credit agreement

500,000,000

2020 Credit Agreement [Member] | 3-year Term Loan Facility [Member]

Debt Instrument [Line Items]

Credit facility, maximum borrowing capacity

$ 500,000,000

Debt instrument, term

3 years

Repayments of long-term notes

250,000,000

Term loan outstanding

$ 250,000,000

Minimum [Member] | Line of Credit [Member]

Debt Instrument [Line Items]

Quarterly facility fee (percent)

0.11%

Maximum [Member] | Line of Credit [Member]

Debt Instrument [Line Items]

Quarterly facility fee (percent)

0.20%

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Contractual interest expense	$ 15,918	$ 8,438	$ 45,734	$ 26,945
Amortization of debt issuance costs	393	182	1,780	1,488
Amortization of debt discount	161	41	410	8,232
Debt Instrument, Interest Expense, Total	$ 16,472	$ 8,661	$ 47,924	$ 36,665

Derivative Financial Instrume_3

Derivative Financial Instruments (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash flow hedge instrument term, maximum	12 months
Cumulative unrealized gain (loss) on cash flow derivative instruments	$ 1.5

Derivative Financial Instrume_4

Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Instruments) (Details) - Cash Flow Hedging [Member] - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives
Asset derivatives	$ 2,112	$ 1,335
Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liability Derivatives
Liability derivatives	429	371
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives
Asset derivatives	53	554
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liability Derivatives
Liability derivatives	$ 5,640	$ 1,019

Derivative Financial Instrume_5

Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ 2,123	$ (1,936)	$ 667	$ (610)
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss	(390)	162	(1,061)	(829)
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Income, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Income on Derivative	(7,407)	4,108	(4,878)	2,128
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss)	2,123	(1,936)	667	(610)
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Operating Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss	$ (390)	$ 162	$ (1,061)	$ (829)

Derivative Financial Instrume_6

Derivative Financial Instruments (Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding) (Details) - Sep. 30, 2020 € in Thousands, ₩ in Thousands, ₨ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, kr in Thousands, SFr in Thousands, R$ in Thousands, Kč in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands

AUD ($)

BRL (R$)

GBP (£)

CAD ($)

CNY (¥)

CZK (Kč)

DKK (kr)

EUR (€)

HKD ($)

INR (₨)

JPY (¥)

KRW (₩)

SGD ($)

CHF (SFr)

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional foreign currency forward contracts outstanding

$ 30,400

R$ 2800

£ 5,200

$ 350

¥ 35,600

Kč 2,900

kr 5,650

€ 164

$ 11,400

₨ 456,000

¥ 171,000

₩ 3,073,000

$ 12,300

SFr 167,055

Comprehensive Income (Changes i

Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (93,596)	$ 508,022	$ 837,656	$ 551,519
Other comprehensive income (loss) before reclassifications			(241)
Amounts reclassified from accumulated other comprehensive loss			1,041
Other comprehensive income (loss)	2,138	(1,872)	800	1,672
Ending balance	68,800	712,911	68,800	712,911
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(2,946)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			0
Ending balance	(2,946)		(2,946)
Unrealized Net (Loss) Gains on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(139)
Other comprehensive income (loss) before reclassifications			145
Amounts reclassified from accumulated other comprehensive loss			(20)
Other comprehensive income (loss)			125
Ending balance	(14)		(14)
Unrealized Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			868
Other comprehensive income (loss) before reclassifications			(394)
Amounts reclassified from accumulated other comprehensive loss			1,061
Other comprehensive income (loss)			667
Ending balance	1,535		1,535
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			(2,910)
Other comprehensive income (loss) before reclassifications			8
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			8
Ending balance	(2,902)		(2,902)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(6,465)	(4,610)	(5,127)	(8,154)
Other comprehensive income (loss)	2,138	(1,872)	800	1,672
Ending balance	$ (4,327)	$ (6,482)	$ (4,327)	$ (6,482)

Comprehensive Income (Reclassif

Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	$ (3,841)	$ (3,456)	$ (7,850)	$ (3,735)
Operating expenses	511,579	495,152	1,588,418	1,505,114
Net income	(98,227)	$ (270,857)	(392,355)	$ (474,700)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	391		1,041
Unrealized Net Gains on Available-for-sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income, net	1		(20)
Unrealized Net Losses on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operating expenses	$ 390		$ 1,061

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Income Tax Contingency [Line Items]
Effective tax rate	15.30%	(150.50%)	10.00%	(42.30%)
Tax benefit attributable to the 2015 U.S. federal income tax return statute of limitations closing		$ 17.3		$ 17.3
Net unrecognized tax benefit	$ 75		$ 75		$ 84.5
Unrecognized tax benefits that would impact effective tax rate	63		63
Income tax interest and penalties accrued	3.9		3.9
Net deferred tax assets	$ 393.9		$ 393.9
Swiss Federal Tax Administration (FTA) [Member]
Income Tax Contingency [Line Items]
Income tax benefit due to recognition of Swiss deferred tax assets		$ 157.7		$ 157.7

Treasury Stock (Details)

Treasury Stock (Details) - USD ($)	Jan. 30, 2020	Aug. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 31, 2020
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount							$ 1,000,000,000
Available to repurchase common stock			$ 714,100,000		$ 714,100,000
Amount expended on share repurchases in open market transactions				$ 103,905,000	$ 199,903,000	$ 353,904,000
Number of shares withheld to satisfy minimum tax withholding obligations			25,826	44,829	765,426	742,946
Payment for tax withholding related to vested stock units			$ 3,700,000	$ 4,200,000	$ 104,800,000	$ 74,800,000
Open Market Purchases [Member]
Equity, Class of Treasury Stock [Line Items]
Amount expended on share repurchases in open market transactions			$ 0	$ 103,900,000	$ 199,900,000	$ 353,900,000
Stock repurchases net (shares)				1,130,100	1,731,500	3,640,982
Average per share price on share repurchases in open market transactions (in dollars per share)				$ 91.94	$ 115.45	$ 97.20
ASR Counterparty [Member]
Equity, Class of Treasury Stock [Line Items]
Amount expended on share repurchases in open market transactions	$ 1,000,000,000
Stock repurchases net (shares)	6,500,000	800,000

Commitment and Contingencies (D

Commitment and Contingencies (Details) - USD ($)	1 Months Ended
	May 31, 2020	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Purchase commitment	$ 1,000,000,000
Remaining obligation under purchase agreement		$ 969,800,000

Restructuring (Components) (Det

Restructuring (Components) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Employee severance and related costs	$ 0	$ 6,213	$ 3,100	$ 13,356
Consolidation of leased facilities	0	2,666	0	2,666
Right-of-use asset impairment	0	0	8,881	0
Total Restructuring charges	$ 0	$ 8,879	$ 11,981	$ 16,022

Restructuring (Impairment Charg

Restructuring (Impairment Charges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Right-of-use asset impairment	$ 0	$ 0	$ 8,881	$ 0
Level 3 [Member]
Restructuring Cost and Reserve [Line Items]
Right-of-use asset impairment			$ 8,900

Restructuring (Activity in Rest

Restructuring (Activity in Restructuring Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Reserve [Roll Forward]
Balance at January 1, 2020			$ 6,957
Employee severance and related costs	$ 0	$ 6,213	3,100	$ 13,356
Payments			(8,492)
Balance at September 30, 2020	$ 1,565		$ 1,565

Statement of Changes in Equit_2

Statement of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 25, 2020	Jun. 19, 2020	Mar. 20, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Settlement of warrants (shares)					200,000
Beginning balance				$ (93,596)	$ 508,022	$ 837,656	$ 551,519
Stock-based compensation expense				85,169	68,969	228,854	202,523
Temporary equity reclassification							8,110
Common stock issued under employee stock purchase plan				23,600	20,455	44,635	39,471
Stock repurchases, net					(103,905)	(199,903)	(353,904)
Restricted shares turned in for tax withholding				(3,692)	(4,242)	(104,848)	(74,794)
Cash dividends declared				(43,046)	(45,373)	(129,108)	(137,224)
Accelerated stock repurchase program						(1,000,000)
Other comprehensive income, net of tax				2,138	(1,872)	800	1,672
Net income				98,227	270,857	392,355	474,700
Ending balance				$ 68,800	$ 712,911	$ 68,800	$ 712,911
Beginning balance, treasury shares (in shares)						(188,693,000)
Restricted shares turned in for tax withholding (in shares)				(25,826)	(44,829)	(765,426)	(742,946)
Ending balance, treasury shares (in shares)				(198,568,000)		(198,568,000)
Cash dividend paid (in dollars per share)	$ 0.35	$ 0.35	$ 0.35
Cumulative Effect, Period of Adoption, Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance						$ (1,641)	$ 838
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)				321,210,000	316,969,000	318,760,000	309,761,000
Shares issued under stock compensation plans (shares)				109,000	123,000	2,314,000	2,167,000
Common stock issued under employee stock purchase plan (shares)				238,000	255,000	483,000	471,000
Shares issued upon conversion of debt (shares)							4,950,000
Settlement of warrants (shares)					202,000		202,000
Other (in shares)							(2,000)
Ending balance (in shares)				321,557,000	317,549,000	321,557,000	317,549,000
Beginning balance				$ 321	$ 317	$ 319	$ 310
Shares issued under stock-based compensation plans						2	2
Common stock issued under employee stock purchase plan				1	1	1	1
Settlement of convertible notes and hedges							5
Ending balance				322	318	322	318
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				6,216,838	6,078,960	6,249,065	5,404,500
Shares issued under stock-based compensation plans						(2)	(2)
Stock-based compensation expense				85,169	68,969	228,854	202,523
Temporary equity reclassification							8,110
Common stock issued under employee stock purchase plan				23,599	20,454	44,634	39,470
Settlement of convertible notes and hedges							509,519
Accelerated stock repurchase program				200,000		0
Other				1,756	2,194	4,811	6,457
Ending balance				6,527,362	6,170,577	6,527,362	6,170,577
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				4,863,515	4,277,586	4,660,145	4,169,019
Cash dividends declared				(43,046)	(45,373)	(129,108)	(137,224)
Other				(1,756)	(2,194)	(4,811)	(6,457)
Net income				98,227	270,857	392,355	474,700
Ending balance				4,916,940	4,500,876	4,916,940	4,500,876
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance						(1,641)	838
Accumulated Other Comprehensive Loss [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				(6,465)	(4,610)	(5,127)	(8,154)
Other comprehensive income, net of tax				2,138	(1,872)	800	1,672
Ending balance				(4,327)	(6,482)	(4,327)	(6,482)
Common Stock in Treasury [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance				(11,167,805)	(9,844,231)	(10,066,746)	(9,014,156)
Stock repurchases, net					(103,905)	(199,903)	(353,904)
Restricted shares turned in for tax withholding				(3,692)	(4,242)	(104,848)	(74,794)
Settlement of convertible notes and hedges							(509,524)
Accelerated stock repurchase program				(200,000)		(1,000,000)
Ending balance				$ (11,371,497)	$ (9,952,378)	$ (11,371,497)	$ (9,952,378)
Beginning balance, treasury shares (in shares)				(197,693,000)	(186,486,000)	(188,693,000)	(178,327,000)
Stock repurchases net (in shares)					(1,130,000)	(1,732,000)	(3,641,000)
Restricted shares turned in for tax withholding (in shares)				(26,000)	(45,000)	(765,000)	(743,000)
Settlement of convertible notes and hedges (in shares)							(4,950,000)
Accelerated stock repurchases (in shares)				(849,000)		(7,378,000)
Ending balance, treasury shares (in shares)				(198,568,000)	(187,661,000)	(198,568,000)	(187,661,000)

Statement of Changes in Equit_3

Statement of Changes in Equity - Subsequent Event (Details)	Oct. 22, 2020$ / shares
Subsequent Event [Member]
Quarterly dividend approved (per share)	$ 0.35