Citrix Systems (CTXS) 10-Q 4 Aug 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	CTXS
Entity Registrant Name	CITRIX SYSTEMS INC
Entity Central Index Key	877,890
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		151,511,325

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 844,771	$ 836,095
Short-term investments, available-for-sale	511,092	726,923
Accounts receivable, net of allowances of $4,048 and $5,883 at June 30, 2017 and December 31, 2016, respectively	541,315	681,206
Inventories, net	13,229	12,522
Prepaid expenses and other current assets	176,080	124,842
Current assets of discontinued operations	0	179,689
Total current assets	2,086,487	2,561,277
Long-term investments, available-for-sale	1,045,384	980,142
Property and equipment, net	252,925	261,954
Goodwill	1,617,105	1,585,893
Other intangible assets, net	187,550	173,681
Deferred tax assets, net	177,375	233,900
Other assets	64,083	54,449
Long-term assets of discontinued operations	0	538,931
Total assets	5,430,909	6,390,227
Current liabilities:
Accounts payable	65,265	72,724
Accrued expenses and other current liabilities	240,808	256,799
Income taxes payable	4,724	39,771
Current portion of deferred revenues	1,205,692	1,208,229
Short-term debt	30,000	0
Convertible notes, short-term	0	1,348,156
Current liabilities of discontinued operations	0	172,670
Total current liabilities	1,546,489	3,098,349
Long-term portion of deferred revenues	510,209	476,135
Convertible notes, long-term	1,367,092	0
Other liabilities	125,418	119,813
Long-term liabilities of discontinued operations	0	7,708
Commitments and contingencies
Temporary equity from Convertible notes	0	79,495
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; 304,891 and 302,851 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	305	303
Additional paid-in capital	4,922,187	4,761,588
Retained earnings	3,663,732	4,010,737
Accumulated other comprehensive loss	(8,779)	(28,704)
Stockholders' equity before treasury stock	8,577,445	8,743,924
Less - common stock in treasury, at cost (153,687 and 146,552 shares at June 30, 2017 and December 31, 2016, respectively)	(6,695,744)	(6,135,197)
Total stockholders' equity	1,881,701	2,608,727
Total liabilities, temporary equity and stockholders' equity	$ 5,430,909	$ 6,390,227

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 4,048	$ 5,883
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	304,891,000	302,851,000
Common stock, shares outstanding	304,891,000	302,851,000
Common stock in treasury, shares	153,687,000	146,552,000

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Product and licenses	$ 211,009	$ 219,507	$ 402,606	$ 421,540
Software as a service	41,513	32,764	80,243	63,879
License updates and maintenance	409,028	386,864	811,783	779,882
Professional services	31,677	34,852	61,272	67,459
Total net revenues	693,227	673,987	1,355,904	1,332,760
Cost of net revenues:
Cost of product and license revenues	32,735	33,623	62,446	65,018
Cost of services and maintenance revenues	64,167	59,178	123,826	113,537
Amortization of product related intangible assets	12,410	14,390	25,498	28,447
Total cost of net revenues	109,312	107,191	211,770	207,002
Gross margin	583,915	566,796	1,144,134	1,125,758
Operating expenses:
Research and development	106,696	100,651	209,365	202,883
Sales, marketing and services	268,300	245,921	515,065	479,848
General and administrative	81,146	78,883	157,655	157,158
Amortization of other intangible assets	3,692	3,822	7,338	7,542
Restructuring	2,140	3,580	10,126	49,136
Total operating expenses	461,974	432,857	899,549	896,567
Income from operations	121,941	133,939	244,585	229,191
Interest income	5,560	4,164	11,172	7,915
Interest expense	(12,007)	(11,196)	(23,560)	(22,351)
Other (expense) income, net	(1,141)	(272)	2,185	(1,275)
Income from continuing operations before income taxes	114,353	126,635	234,382	213,480
Income tax expense	5,524	20,346	55,228	33,937
Income from continuing operations	108,829	106,289	179,154	179,543
Income (loss) from discontinued operations, net of income taxes	0	14,609	(42,704)	24,818
Net income	$ 108,829	$ 120,898	$ 136,450	$ 204,361
Basic earnings (loss) per share:
Income from continuing operations, basic (in dollars per share)	$ 0.72	$ 0.69	$ 1.18	$ 1.16
Income (loss) from discontinued operations, basic (in dollars per share)	0	0.09	(0.28)	0.16
Basic earnings per share (in dollars per share)	0.72	0.78	0.90	1.32
Diluted earnings (loss) per share:
Income from continuing operations, diluted (in dollars per share)	0.70	0.68	1.14	1.15
Income (loss) from discontinued operations, diluted (in dollars per share)	0	0.09	(0.27)	0.16
Diluted earnings per share (in dollars per share)	$ 0.70	$ 0.77	$ 0.87	$ 1.31
Weighted average shares outstanding:
Basic (in shares)	151,212	154,998	152,247	154,485
Diluted (in shares)	156,036	156,666	157,239	156,258

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unuaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 108,829	$ 120,898	$ 136,450	$ 204,361
Available for sale securities:
Change in net unrealized gains	350	1,793	1,440	5,892
Less: reclassification adjustment for net gains included in net income	(85)	(270)	(460)	(292)
Net change (net of tax effect)	265	1,523	980	5,600
Loss on pension liability	0	0	9	0
Cash flow hedges:
Change in unrealized gains (losses)	1,884	(2,218)	3,876	4
Less: reclassification adjustment for net losses (gains) included in net income	6	(142)	1,678	1,023
Net change (net of tax effect)	1,890	(2,360)	5,554	1,027
Other comprehensive income (loss)	2,155	(837)	6,525	6,627
Comprehensive income	$ 110,984	$ 120,061	$ 142,975	$ 210,988

Condensed Consolidated Stateme6

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net income	$ 136,450	$ 204,361
Loss (income) from discontinued operations	42,704	(24,818)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	97,403	112,465
Stock-based compensation expense	75,487	74,428
Excess tax benefit from stock-based compensation	0	(10,308)
Deferred income tax expense (benefit)	56,584	(9,508)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	(6,049)	(2,242)
Other non-cash items	7,812	2,801
Total adjustments to reconcile net income to net cash provided by operating activities	231,237	167,636
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	140,471	162,958
Inventories	(1,398)	(1,463)
Prepaid expenses and other current assets	(5,957)	(13,672)
Other assets	(9,597)	2,597
Income taxes, net	(73,567)	45,392
Accounts payable	(9,272)	(24,532)
Accrued expenses and other current liabilities	(20,536)	13,368
Deferred revenues	26,084	(28,052)
Other liabilities	(790)	(2,525)
Total changes in operating assets and liabilities, net of the effects of acquisitions	45,438	154,071
Net cash provided by operating activities of continuing operations	455,829	501,250
Net cash (used in) provided by operating activities of discontinued operations	(56,070)	67,077
Net cash provided by operating activities	399,759	568,327
Investing Activities
Purchases of available-for-sale investments	(590,004)	(907,498)
Proceeds from sales of available-for-sale investments	562,098	446,932
Proceeds from maturities of available-for-sale investments	179,330	322,100
Purchases of property and equipment	(38,650)	(48,687)
Cash paid for acquisitions, net of cash acquired	(60,449)	0
Cash paid for licensing agreements and technology	(5,155)	(24,577)
Other	987	544
Net cash provided by (used in) investing activities of continuing operations	48,157	(211,186)
Net cash used for investing activities of discontinued operations	(3,891)	(28,249)
Net cash provided by (used in) investing activities	44,266	(239,435)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	1,490	30,559
Proceeds from credit facility	125,000	0
Repayment of credit facility	(95,000)	0
Repayment of acquired debt	(4,000)	0
Excess tax benefit from stock-based compensation	0	10,308
Stock repurchases, net	(500,000)	(28,689)
Cash paid for tax withholding on vested stock awards	(60,547)	(43,842)
Transfer of cash to GoTo Business resulting from the separation	(28,523)	0
Net cash used in financing activities	(561,580)	(31,664)
Effect of exchange rate changes on cash and cash equivalents	5,370	486
Change in cash and cash equivalents	(112,185)	297,714
Cash and cash equivalents at beginning of period, including cash of discontinued operations of $120,861 and $57,762, respectively	956,956	368,518
Cash and cash equivalents at end of period	844,771	666,232
Less cash of discontinued operations	0	(71,126)
Cash and cash equivalents at end of period	$ 844,771	$ 595,106

Condensed Consolidated Stateme7

Condensed Consolidated Statements Of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Cash of discontinued operations	$ 0	$ 120,861	$ 71,126	$ 57,762

Background and Basis of Present

Background and Basis of Presentation	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BACKGROUND AND BASIS OF PRESENTATION	BACKGROUND AND BASIS OF PRESENTATION Background On January 31, 2017, Citrix Systems, Inc. (the "Company") completed the spin-off of its GoTo family of service offerings (the “Spin-off”) and subsequent merger of that business with LogMeIn, Inc. (the “Merger”) pursuant to a pro rata distribution to its stockholders of 100% of the shares of common stock of GetGo, Inc., or GetGo, its wholly-owned subsidiary. Pursuant to the transaction, the Company transferred its GoTo Business to GetGo, and after the close of business on January 31, 2017, the Company distributed approximately 26.9 million shares of GetGo common stock to the Company’s stockholders of record as of the close of business on January 20, 2017 (the “Record Date”). Immediately following the distribution, Lithium Merger Sub, Inc., a wholly-owned subsidiary of LogMeIn, merged with and into GetGo, with GetGo as the surviving corporation (the “Merger”). In connection with the Merger, GetGo became a wholly-owned subsidiary of LogMeIn, and each share of GetGo common stock was converted into the right to receive one share of LogMeIn common stock. As a result of these transactions, the Company’s stockholders received approximately 26.9 million shares of LogMeIn common stock in the aggregate, or 0.171844291 of a share of LogMeIn common stock for each share of the Company’s common stock held of record by such stockholders on the Record Date. No fractional shares of LogMeIn were issued, and the Company’s stockholders instead received cash in lieu of any fractional shares. The Company's revenues are derived from sales of its Workspace Services products, Networking products (formerly Delivery Networking), Data offerings (formerly Cloud) and related License updates and maintenance and Professional services. Prior to the Spin-off, the Company also derived its revenues from sales of the GoTo Business, which were delivered as cloud-based Software as a service ("SaaS"), and included Communications Cloud and Workflow Cloud service offerings. Subsequent to the Spin-off, the Company determined that it has one reportable segment. The Company identified its segment using the “management approach” which designates the internal organization that is used by management for making operating decisions and assessing performance. See Note 10 for more information on the Company's segments. Basis of presentation The accompanying unaudited condensed consolidated financial statements of 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. 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, 2016 . 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. All significant transactions and balances between the Company and its subsidiaries have been eliminated in consolidation. In these condensed consolidated financial statements, unless otherwise indicated, references to Citrix and the Company, refer to Citrix Systems, Inc. and its consolidated subsidiaries after giving effect to the Spin-off. As a result of the Spin-off, the condensed consolidated financial statements reflect the GoTo Business operations, assets and liabilities, and cash flows as discontinued operations for all periods presented. Refer to Note 3 for additional information regarding the Spin-off.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES 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 the provision for doubtful accounts receivable, 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, 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 fair value of convertible senior notes, the provision for lease losses, the provision for income taxes and the amortization and depreciation periods for 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 as of June 30, 2017 and December 31, 2016 primarily consist of agency securities, corporate securities, municipal securities and government securities. Investments classified as available-for-sale 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 changes in the fair value of its available-for-sale investments in income unless a decline in value is considered other-than-temporary in accordance with the authoritative guidance. 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 investment information. Revenue Recognition Net revenues include the following categories: Product and licenses, SaaS, License updates and maintenance and Professional services. Product and licenses revenues primarily represent fees related to the licensing of the Company’s software and hardware appliances. These revenues are reflected net of sales allowances, cooperative advertising agreements, partner incentive programs and provisions for returns. SaaS revenues consist primarily of fees related to online service agreements, which are recognized ratably over the contract term. Should the Company charge set-up fees, they would be recognized ratably over the contract term or the expected customer life, whichever is longer. License updates and maintenance revenues consist of fees related to the Subscription Advantage program and maintenance fees, which include technical support and hardware and software maintenance. Subscription Advantage and maintenance fees are recognized ratably over the term of the contract, which is typically 12 to 24 months. The Company capitalizes certain third-party commissions related to Subscription Advantage, maintenance and support renewals. The capitalized commissions are amortized to Sales, marketing and services expense at the time the related deferred revenue is recognized as revenue. Hardware and software maintenance and support contracts are typically sold separately. Hardware maintenance includes technical support, the latest software upgrades when and if they become available, and replacement of malfunctioning appliances. Dedicated account management is available as an add-on to the program for a higher level of service. Software maintenance, including the new Customer Success Services, includes unlimited technical support, immediate access to software upgrades, enhancements and maintenance releases when and if they become available during the term of the contract and configuration and installation support along with acceleration and automation tools. Professional services revenues are comprised of fees from consulting services related to the implementation of the Company’s products and fees from product training and certification, which are recognized as the services are provided. The Company recognizes revenue when it is earned and when all of the following criteria are met: (1) persuasive evidence of the arrangement exists; (2) delivery has occurred or the service has been provided and the Company has no remaining obligations; (3) the fee is fixed or determinable; and (4) collectability is probable. The majority of the Company’s product and license revenue consists of revenue from the sale of software products. Software sales generally include a perpetual license to the Company’s software and is subject to the industry specific software revenue recognition guidance. In accordance with this guidance, the Company allocates revenue to license updates related to its stand-alone software and any other undelivered elements of the arrangement based on vendor specific objective evidence (“VSOE”) of fair value of each element and such amounts are deferred until the applicable delivery criteria and other revenue recognition criteria described above have been met. The balance of the revenues, net of any discounts inherent in the arrangement, is recognized at the outset of the arrangement using the residual method as the product licenses are delivered. If management cannot objectively determine the fair value of each undelivered element based on VSOE of fair value, revenue recognition is deferred until all elements are delivered, all services have been performed, or until fair value can be objectively determined. For hardware appliance and software transactions, the arrangement consideration is allocated to stand-alone software deliverables as a group and the non-software deliverables based on the relative selling prices using the selling price hierarchy in the revenue recognition guidance. The selling price hierarchy for a deliverable is based on its VSOE if available, third-party evidence of selling price ("TPE") if VSOE is not available, or estimated selling price ("ESP") if neither VSOE nor TPE is available. The Company then recognizes revenue on each deliverable in accordance with its policies for product and service revenue recognition. VSOE of selling price is based on the price charged when the element is sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices fall within a reasonable range based on historical discounting trends for specific products and services. TPE of selling price is established by evaluating competitor products or services in stand-alone sales to similarly situated customers. However, as the Company’s products contain a significant element of proprietary technology and its solutions offer substantially different features and functionality, the comparable pricing of products with similar functionality typically cannot be obtained. Additionally, as the Company is unable to reliably determine what competitors products’ selling prices are on a stand-alone basis, the Company is not typically able to determine TPE. The estimate of selling price is established considering multiple factors including, but not limited to, pricing practices in different geographies and through different sales channels and competitor pricing strategies. The Citrix Service Provider ("CSP") program provides subscription-based services in which the CSP partners host software services to their end users. The fees from the CSP program are recognized based on usage and as the CSP services are provided to their end users. For the Company’s non-software transactions, it allocates the arrangement consideration based on the relative selling price of the deliverables. For the Company’s hardware appliances, it uses ESP as its selling price. For the Company’s support and services, it generally uses VSOE as its selling price. When the Company is unable to establish selling price using VSOE for its support and services, the Company uses ESP in its allocation of arrangement consideration. The majority of the Company's SaaS offerings are considered hosted service arrangements per the authoritative guidance. In the normal course of business, the Company is not obligated to accept product returns from its resellers or end customers under any conditions, unless the product item is defective in manufacture. The Company establishes provisions for estimated returns, as well as other sales allowances, concurrently with the recognition of revenue. The provisions are established based upon consideration of a variety of factors, including, among other things, recent and historical return rates for both specific products and distributors and the impact of any new product releases and projected economic conditions. Product returns are provided for in the condensed consolidated financial statements and have historically been within management’s expectations. Allowances for estimated product returns amounted to $0.9 million and $2.0 million at June 30, 2017 and December 31, 2016 , respectively. The Company also records estimated reductions to revenue for customer programs and incentive offerings, including volume-based incentives. The Company could take actions to increase its customer incentive offerings, which could result in an incremental reduction to revenue at the time the incentive is offered. 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. Foreign currency transaction gains and losses are the result of exchange rate changes on transactions denominated in currencies other than the functional currency, including U.S. dollars. The remeasurement of those foreign currency transactions is included in determining net income or loss for the period of exchange. Prior to January 1, 2015, the functional currency of the Company’s wholly-owned foreign subsidiaries of its former GoTo Business was the currency of the country in which each subsidiary is located. The Company translated assets and liabilities of these foreign subsidiaries at exchange rates in effect at the balance sheet date and included accumulated net translation adjustments in equity as a component of Accumulated other comprehensive loss. As a result of the change in functional currency, the gains and losses that were previously recorded in Accumulated other comprehensive loss prior to January 1, 2015 were kept constant. As a result of the Spin-off , accumulated net translation adjustments associated with the GoTo Business recorded in Accumulated other comprehensive loss of $13.4 million were reclassified to Retained earnings during the period ended June 30, 2017 . See Note 3 for additional information regarding discontinued operations. 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. Reclassifications Certain reclassifications of the prior years' amounts have been made to conform to the current year's presentation.

Discontinued Operations

Discontinued Operations	6 Months Ended
	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS	DISCONTINUED OPERATIONS On January 31, 2017, the Company completed the Spin-off of the GoTo Business. Refer to Note 1 for additional information regarding the Spin-off. The financial results of the GoTo Business are presented as Income (loss) from discontinued operations, net of income taxes in the condensed consolidated statements of income. The following table presents the financial results of the GoTo Business through the date of the Spin-off for the indicated periods and do not include corporate overhead allocations: Major classes of line items constituting Income (loss) from discontinued operations related to the GoTo Business Three Months Ended June 30, Six Months Ended June 30, 2016 2017 2016 (in thousands) Net revenues $ 168,993 $ 58,215 $ 335,898 Cost of net revenues 37,131 15,456 76,412 Gross margin 131,862 42,759 259,486 Operating expenses: Research and development 24,110 9,108 45,837 Sales, marketing and services 52,528 20,881 111,349 General and administrative 18,626 7,636 31,586 Amortization of other intangible assets 3,464 1,176 7,138 Restructuring 436 3,189 945 Separation 13,550 40,573 27,781 Total operating expenses 112,714 82,563 224,636 Income (loss) from discontinued operations before income taxes 19,148 (39,804 ) 34,850 Income tax expense 4,539 2,900 10,032 Income (loss) from discontinued operations, net of income tax $ 14,609 $ (42,704 ) $ 24,818 The Company incurred significant costs in connection with the separation of its GoTo Business. These costs relate primarily to third-party advisory and consulting services, retention payments to certain employees, incremental stock-based compensation and other costs directly related to the separation of the GoTo Business. During the three months ended June 30, 2016 , the Company also incurred an additional $13.6 million of separation costs, which are included in discontinued operations. During the six months ended June 30, 2017 and 2016 , the Company incurred $40.6 million and $27.8 million , respectively, of separation costs, which are included in discontinued operations. During the three months ended June 30, 2017 and 2016 , the Company incurred $0.2 million and $0.4 million of separation costs, respectively, which are included in continuing operations. During the six months ended June 30, 2017 and 2016 , the Company incurred $0.5 million and $0.8 million of separation costs, respectively, which are included in continuing operations. The assets and liabilities of the GoTo Business were re-classified as discontinued operations as of December 31, 2016 . Carrying amounts of major classes of assets and liabilities included as part of discontinued operations related to the GoTo Business December 31, 2016 (in thousands) Assets Current assets: Cash $ 120,861 Accounts receivable, net 44,734 Prepaid expenses and other current assets 14,094 Total current assets of discontinued operations 179,689 Property and equipment, net 81,866 Goodwill 380,917 Other intangible assets, net 54,312 Deferred tax assets, net 18,496 Other assets 3,340 Long-term assets of discontinued operations $ 538,931 Total major classes of assets of discontinued operations $ 718,620 Liabilities Current liabilities: Accounts payable $ 11,333 Accrued expenses and other current liabilities 46,088 Current portion of deferred revenues 115,249 Total current liabilities of discontinued operations 172,670 Long-term portion of deferred revenues 4,224 Other liabilities 3,484 Long-term liabilities of discontinued operations $ 7,708 Total major classes of liabilities of discontinued operations $ 180,378 As a result of the Spin-off, the Company recorded a $478.2 million reduction in retained earnings which included net assets of $464.8 million . Of this amount, $28.5 million represents cash transferred to the GoTo Business, with the remainder considered a non-cash activity in the Condensed Consolidated Statements of Cash Flows. In accordance with the definitive agreements governing the Spin-off, the Company continues to evaluate certain assets and liabilities, which is expected to be finalized in the third quarter of fiscal year 2017. The Spin-off also resulted in a reduction of Accumulated other comprehensive loss associated with foreign currency translation adjustments of $13.4 million , which was reclassified to Retained earnings. Citrix and GetGo entered into several agreements in connection with the Spin-off, including a transition services agreement ("TSA"), separation and distribution agreement, tax matters agreement, intellectual property matters agreement, and an employee matters agreement. Pursuant to the TSA, Citrix, GetGo and their respective subsidiaries are providing various services to each other on an interim, transitional basis. Services being provided by Citrix include, among others, finance, information technology and certain other administrative services. The services generally commenced on February 1, 2017 and are generally expected to terminate within 12 months of that date. Billings by Citrix under the TSA were not material for the three or six months ended June 30, 2017 .

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
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 (calculated using the treasury stock method) 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Numerator: Income from continuing operations $ 108,829 $ 106,289 $ 179,154 $ 179,543 Income (loss) from discontinued operations, net of income taxes — 14,609 (42,704 ) 24,818 Net income $ 108,829 $ 120,898 $ 136,450 $ 204,361 Denominator: Denominator for basic net earnings per share - weighted-average shares outstanding 151,212 154,998 152,247 154,485 Effect of dilutive employee stock awards 2,180 1,668 2,815 1,773 Effect of dilutive Convertible Notes 2,644 — 2,177 — Denominator for diluted net earnings per share - weighted-average shares outstanding 156,036 156,666 157,239 156,258 Basic earnings (loss) per share: Income from continuing operations $ 0.72 $ 0.69 $ 1.18 $ 1.16 Income (loss) from discontinued operations — 0.09 (0.28 ) 0.16 Basic net earnings per share $ 0.72 $ 0.78 $ 0.90 $ 1.32 Diluted earnings (loss) per share: Income from continuing operations $ 0.70 $ 0.68 $ 1.14 $ 1.15 Income (loss) from discontinued operations — 0.09 (0.27 ) 0.16 Diluted net earnings per share: $ 0.70 $ 0.77 $ 0.87 $ 1.31 Anti-dilutive weighted-average shares from stock awards 274 296 977 574 The weighted-average number of shares outstanding used in the computation of basic and diluted earnings per share does not include common stock issuable upon the exercise of the Company's warrants. The effects of these potentially issuable shares were not included in the calculation of diluted earnings per share because the effect would have been anti-dilutive. The Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on its Convertible Notes on diluted earnings per share, if applicable, because upon conversion the Company will pay cash up to the aggregate principal amount of the Convertible Notes to be converted and pay or deliver, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at the Company’s election, in respect of the remainder, if any, of the Company’s conversion obligation in excess of the aggregate principal amount of the Convertible Notes being converted. The conversion spread will have a dilutive impact on diluted earnings per share when the average market price of the Company’s common stock for a given period exceeds the conversion price. Prior to the separation of the GoTo Business on January 31, 2017, the conversion price was $90.00 per share. As a result of the Spin-off, the conversion rate for the Convertible Notes was re-set as of the opening of business on February 1, 2017 to 13.9061 shares of the Company’s common stock per $1,000 principal amount of Convertible Notes, which corresponds to a conversion price of $71.91 per share of common stock. Similar adjustments were made to the conversion rates for the Convertible Note Hedge and Warrant Transactions as of the opening of business on February 1, 2017. For the three and six months ended June 30, 2017 , the average market price of the Company's common stock exceeded the new conversion price, therefore the dilutive effect of the Convertible Notes was included in the denominator of diluted earnings per share. For the three and six months ended June 30, 2016 , the Convertible Notes have been excluded from the computation of diluted earnings per share as the effect would be anti-dilutive since the prior conversion price of the Convertible Notes exceeded the average market price of the Company’s common stock. In addition, the Company uses the treasury stock method for calculating any potential dilutive effect related to the warrants. See Note 11 to the Company's condensed consolidated financial statements for detailed information on the Convertible Notes offering.

Acquisitions and Divestitures

Acquisitions and Divestitures	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
ACQUISITIONS AND DIVESTITURES	ACQUISITIONS AND DIVESTITURES 2017 Business Combination On January 3, 2017, the Company acquired all of the issued and outstanding securities of Unidesk Corporation (“Unidesk” or the “2017 Business Combination"). Citrix acquired Unidesk to enhance its application management and delivery offerings. The total cash consideration for this transaction was $60.4 million , net of $2.7 million cash acquired. Transaction costs associated with the acquisition were $0.4 million . No transaction costs were incurred during the three months ended June 30, 2017 . The Company expensed $0.1 million of transaction costs during the six months ended June 30, 2017 , which were included in General and administrative expense in the accompanying condensed consolidated statements of income. Purchase Accounting for the 2017 Business Combination The purchase price for Unidesk was allocated to the acquired net tangible and intangible assets based on estimated fair values as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands): Unidesk Purchase Price Allocation Asset Life Current assets $ 5,321 Property and equipment 131 Intangible assets 39,470 4 years Goodwill 31,212 Indefinite Other assets 90 Assets acquired 76,224 Other current liabilities assumed 2,290 Current portion of deferred revenues 3,042 Long term portion of deferred revenues 2,412 Long-term liabilities assumed 4,086 Deferred taxes 1,247 Net assets acquired $ 63,147 Current assets acquired in connection with the Unidesk acquisition consisted primarily of cash, accounts receivable and other short term assets. Current liabilities assumed in connection with the acquisition consisted primarily of accounts payable and other accrued expenses. Long-term liabilities assumed in connection with the acquisition consisted primarily of long-term debt, which was paid in full subsequent to the acquisition date. The Company continues to evaluate certain income tax assets and liabilities related to the Unidesk acquisition. The goodwill related to the Unidesk acquisition is not deductible for tax purposes and is comprised primarily of expected synergies from combining operations and other intangible assets that do not qualify for separate recognition. The Company has included the effect of the Unidesk acquisition in its results of operations prospectively from the date of acquisition. The effect of the acquisition was not material to the Company's consolidated results for the periods presented; accordingly, pro forma financial disclosures have not been presented. Identifiable intangible assets acquired in connection with the Unidesk acquisition (in thousands) and the weighted-average lives are as follows: Unidesk Asset Life Developed technology $ 35,230 4 years Customer contracts 4,240 4 years Total $ 39,470 2016 Business Combination On September 7, 2016, the Company acquired all of the issued and outstanding securities of a privately held company. The acquisition provides a software solution that cuts the cost of desktop and application virtualization and delivers workspace performance by accelerating desktop logon and application response times for any Microsoft Windows-based environment. The total cash consideration for this transaction was $11.5 million , net of $0.8 million cash acquired. Transaction costs were $0.4 million , none of which were incurred during the three and six months ended June 30, 2017 . The Company expensed $0.1 million of transaction costs during the three and six months ended June 30, 2016 . The assets related to this acquisition relate primarily to $8.2 million of product technology identifiable intangible assets with a 4 year life and goodwill of $4.7 million . 2016 Asset Acquisition On January 8, 2016, the Company acquired certain monitoring technology assets from a privately-held company for total cash consideration of $23.6 million . The acquisition provides a monitoring solution for Citrix's products as it relates to Microsoft Windows applications and desktop delivery. The identifiable intangible assets acquired related primarily to product technologies. 2016 Divestiture On February 29, 2016, the Company sold its CloudPlatform and CloudPortal Business Manager products to Persistent Telecom Solutions, Inc. The agreement included contingent consideration in the form of an earnout provision based on revenue for a period of five years following the closing date. Any income associated with the contingent consideration will be recognized if the earnout provisions are met. No earnout provisions were met during the three and six months ended June 30, 2017 . Therefore, no income was recognized during the three and six months ended June 30, 2017 .

Investments

Investments	6 Months Ended
	Jun. 30, 2017
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): June 30, 2017 December 31, 2016 Description of the Securities Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency securities $ 479,435 $ 625 $ (1,293 ) $ 478,767 $ 411,963 $ 699 $ (1,169 ) $ 411,493 Corporate securities 805,137 509 (1,164 ) 804,482 842,887 193 (2,114 ) 840,966 Municipal securities 3,965 12 — 3,977 9,989 3 (4 ) 9,988 Government securities 269,920 73 (743 ) 269,250 445,083 135 (600 ) 444,618 Total $ 1,558,457 $ 1,219 $ (3,200 ) $ 1,556,476 $ 1,709,922 $ 1,030 $ (3,887 ) $ 1,707,065 The change in net unrealized gains (losses) on available-for-sale securities recorded in Other comprehensive income includes unrealized gains (losses) that arose from changes in market value 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, as well as prepayments of available-for-sale investments purchased at a premium. This reclassification has no effect on total comprehensive income or equity and was not material for all periods presented. See Note 14 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 June 30, 2017 were approximately six months and two years, respectively. Realized Gains and Losses on Available-for-sale Investments For the three and six months ended June 30, 2017 , the Company received proceeds from the sales of available-for-sale investments of $104.1 million and $562.1 million , respectively, and for the three and six months ended June 30, 2016 , it received proceeds from the sales of available-for-sale investments of $212.7 million and $446.9 million , respectively. The Company had realized gains on the sales of available-for-sale investments during the three and six months ended June 30, 2017 of $0.2 million and $0.7 million , respectively, and for the three and six months ended June 30, 2016 , it had realized gains on the sales of available-for-sale investments of $0.3 million and $0.5 million , respectively. For the three and six months ended June 30, 2017 , the Company had realized losses on available-for-sale investments of $0.1 million and $0.2 million , respectively, and for the three and six months ended June 30, 2016 , it had realized losses on available-for-sale investments of $0.1 million and $0.3 million , respectively, primarily related to sales of these investments during these periods. All realized gains and losses related to the sales of available-for-sale investments are included in Other (expense) income, net , in the accompanying condensed consolidated statements of income. Unrealized Losses on Available-for-Sale Investments The gross unrealized losses on the Company’s available-for-sale investments that are not deemed to be other-than-temporarily impaired as of June 30, 2017 and December 31, 2016 were $3.2 million and $3.9 million , respectively. Because the Company does not intend to sell any of its investments in an unrealized loss position and it is more likely than not that it will not be required to sell the securities before the recovery of its amortized cost basis, which may not occur until maturity, it does not consider the securities to be other-than-temporarily impaired. Cost Method Investments The Company held direct investments in privately-held companies of $18.5 million and $19.2 million as of June 30, 2017 and December 31, 2016 , respectively, which are accounted for based on the cost method and are included in Other assets in the accompanying condensed consolidated balance sheets. The Company periodically reviews these investments for impairment. If the Company determines that an other-than-temporary impairment has occurred, it will write-down the investment to its fair value. For the three months ended June 30, 2017 , no cost method investments were determined to be impaired. For the six months ended June 30, 2017 , certain cost method investments with a combined carrying value of $2.6 million were determined to be impaired and written down to their estimated fair values of $1.2 million . Accordingly, the Company recorded $1.4 million , respectively, in impairment charges during the six months ended June 30, 2017 , which are included in Other (expense) income, net in the accompanying condensed consolidated statements of income. For the three months ended June 30, 2016 , no cost method investments were determined to be impaired. For the six months ended June 30, 2016 , the Company determined that certain cost method investments were impaired and recorded a charge of $0.3 million , which was included in Other (expense) income, net in the accompanying condensed consolidated statements of income. During the three and six months ended June 30, 2017 , certain companies in which the Company held direct investments were acquired by third parties and as a result of these sales transactions the Company recorded gains of $0.1 million and $1.2 million , respectively, which were included in Other (expense) income, net , in the accompanying condensed consolidated statements of income.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Assets: Cash and cash equivalents: Cash $ 753,839 $ 753,839 $ — $ — Money market funds 89,406 89,406 — — Corporate securities 1,526 — 1,526 — Available-for-sale securities: Agency securities 478,767 — 478,767 — Corporate securities 804,482 — 804,088 394 Municipal securities 3,977 — 3,977 — Government securities 269,250 — 269,250 — Prepaid expenses and other current assets: Foreign currency derivatives 3,264 — 3,264 — Total assets $ 2,404,511 $ 843,245 $ 1,560,872 $ 394 Accrued expenses and other current liabilities: Foreign currency derivatives 989 — 989 — Total liabilities $ 989 $ — $ 989 $ — As of December 31, 2016 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Assets: Cash and cash equivalents: Cash $ 528,637 $ 528,637 $ — $ — Money market funds 224,765 224,765 — — Corporate securities 82,693 — 82,693 — Available-for-sale securities: Agency securities 411,493 — 411,493 — Corporate securities 840,966 — 839,968 998 Municipal securities 9,988 — 9,988 — Government securities 444,618 — 444,618 — Prepaid expenses and other current assets: Foreign currency derivatives 2,506 — 2,506 — Total assets $ 2,545,666 $ 753,402 $ 1,791,266 $ 998 Accrued expenses and other current liabilities: Foreign currency derivatives 4,435 — 4,435 — Total liabilities $ 4,435 $ — $ 4,435 $ — 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 all of its fixed income available-for-sale securities as Level 2. The Company measures its cash flow hedges, which are classified as Prepaid expenses and other current assets and Accrued expenses and other current liabilities, at fair value based on indicative prices in active markets (Level 2 inputs). Assets Measured at Fair Value on a Non-recurring Basis Using Significant Unobservable Inputs (Level 3) For the three months ended June 30, 2017 , no cost method investments were determined to be impaired. During the six months ended June 30, 2017 , certain cost method investments with a combined carrying value of $2.6 million were determined to be impaired and written down to their estimated fair values of $1.2 million . Accordingly, the Company recorded $1.4 million of impairment charges during the six months ended June 30, 2017 , which are included in Other (expense) income, net in the accompanying condensed consolidated statements of income. For the three months ended June 30, 2016 , no cost method investments were determined to be impaired. For the six months ended June 30, 2016 , the Company determined that certain cost method investments were impaired and recorded a charge of $0.3 million , which was included in Other (expense) income, net in the accompanying condensed consolidated statements of income. In determining the fair value of cost method 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. The fair value of the cost method investments represent a Level 3 valuation as the assumptions used in valuing these investments were not directly or indirectly observable. 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. These non-recurring fair value measurements are categorized as Level 3 significant unobservable inputs. See Note 9 to the Company's condensed consolidated financial statements for detailed information related to Goodwill and Other Intangible Assets. 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 June 30, 2017 , the fair value of the Convertible Notes, which 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 June 30, 2017 , and carrying value of debt instruments (carrying value excludes the equity component of the Company’s Convertible Notes classified in equity) was as follows (in thousands): Fair Value Carrying Value Convertible Senior Notes $ 1,738,506 $ 1,367,092

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION 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 June 30, 2017 , 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 Amended and Restated 2014 Equity Incentive Plan (the "2014 Plan"), which was approved at the Company's Annual Meeting of Stockholders on June 22, 2017. In connection with certain of the Company’s acquisitions, the Company has assumed certain plans from acquired companies. The Company’s Board of Directors has provided that no new awards will be granted under the Company’s acquired stock plans. Awards previously granted under the Company's superseded stock plans that are still outstanding typically expire between five and ten years from the date of grant and will continue to be subject to all the terms and conditions of such plans, as applicable. The Company’s superseded stock plans with outstanding awards include the Amended and Restated 2005 Equity Incentive Plan ("2005 Plan"). Under the terms of the 2014 Plan, the Company is authorized to grant incentive stock options (“ISOs”), non-qualified stock options (“NSOs”), non-vested stock, non-vested stock units, stock appreciation rights (“SARs”), and performance units and to make stock-based awards to full and part-time employees of the Company and its subsidiaries or affiliates, where legally eligible to participate, as well as to consultants and non-employee directors of the Company. SARs and ISOs are not currently being granted. Currently, the 2014 Plan provides for the issuance of 46,000,000 shares of common stock. In addition, shares of common stock underlying any awards granted under the Company’s 2014 Plan or the 2005 Plan that are forfeited, canceled or otherwise terminated (other than by exercise) are added to the shares of common stock available for issuance under the 2014 Plan. Under the 2014 Plan, NSOs must be granted at exercise prices no less than fair market value on the date of grant. Non-vested stock awards may be granted for such consideration in cash, other property or services, or a combination thereof, as determined by the Company’s Compensation Committee of its Board of Directors. Stock-based awards are generally exercisable or issuable upon vesting. The Company’s policy is to recognize compensation cost for awards with only service conditions and a graded vesting schedule on a straight-line basis over the requisite service period for the entire award. As of June 30, 2017 , there were 30,340,575 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 25,119,327 shares of common stock. In connection with the completion of the Spin-off, these awards were modified as described below. Under the 2015 ESPP, all full-time and certain part-time employees of the Company are eligible to purchase common stock of the Company twice per year at the end of a six -month payment period (a “Payment Period”). During each Payment Period, eligible employees who so elect may authorize payroll deductions in an amount no less than 1% nor greater than 10% of his or her base pay for each payroll period in the Payment Period. At the end of each Payment Period, the accumulated deductions are used to purchase shares of common stock from the Company up to a maximum of 12,000 shares for any one employee during a Payment Period. Shares are purchased at a price equal to 85% of the fair market value of the Company's common stock, on either the first business day of the Payment Period or the last business day of the Payment Period, whichever is lower. Employees who, after exercising their rights to purchase shares of common stock in the 2015 ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to continue to participate under the 2015 ESPP. The 2015 ESPP provides for the issuance of a maximum of 16,000,000 shares of common stock. As of June 30, 2017 , 974,830 shares have been issued under the 2015 ESPP. The Company recorded stock-based compensation costs related to its employee stock purchase plans of $1.9 million and $2.1 million for the three months ended June 30, 2017 and 2016 , respectively, and it recorded $3.5 million and $4.4 million for the six months ended June 30, 2017 and 2016 , respectively. The Company used the Black-Scholes model to estimate the fair value of its Employee Stock Purchase Plan awards with the following weighted-average assumptions: Six Months Ended June 30, 2017 June 30, 2016 Expected volatility factor 0.29 0.41 Risk free interest rate 0.60 % 0.35 % Expected dividend yield 0 % 0 % Expected life (in years) 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 Company's expected dividend yield input was zero as it has not historically paid, nor expects in the future to pay, cash dividends on its common stock. The expected term is based on the term of the purchase period for grants made under the ESPP. Modifications of Share-Based Awards In connection with the completion of the Spin-off, the terms of the Company's existing stock-based compensation arrangements required adjustments to the number and exercise price of outstanding stock options, non-vested stock units, non-vested stock, performance units, and other share-based awards to preserve the intrinsic value of the awards immediately before and after the Spin-off. The outstanding awards continue to vest over the original vesting periods. Certain outstanding awards at the time of the Spin-off held by employees of the GoTo Business were forfeited at the time of the separation. The stock awards held as of January 31, 2017 were adjusted as follows: • The number of shares of common stock subject to each outstanding stock option was increased and the corresponding exercise price was decreased to maintain the intrinsic value of each outstanding stock option immediately before and after the Spin-off. There was no incremental expense related to this adjustment. • The number of shares of common stock underlying each outstanding non-vested stock unit and performance unit was increased to preserve the intrinsic value of such award immediately prior to the Spin-off. • The opening prices of the performance units granted in 2015 and 2016 were adjusted to reflect the value of the shares of LogMeIn stock distributed to the Company's shareholders as a result of the Spin-off. These adjustments resulted in $6.5 million in incremental compensation expense to be recognized over the remaining vesting life of the underlying awards. Stock-Based Compensation The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands): Three Months Ended Six Months Ended Income Statement Classifications June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 Cost of services and maintenance revenues $ 815 $ 542 $ 1,407 $ 1,036 Research and development 11,660 9,689 21,326 17,444 Sales, marketing and services 14,728 12,560 26,325 23,504 General and administrative 13,476 15,576 26,429 32,444 Total $ 40,679 $ 38,367 $ 75,487 $ 74,428 Non-vested Stock Units Market Performance and Service Condition Stock Units In March 2017, the Company granted senior level employees non-vested stock unit awards representing, in the aggregate, 275,148 non-vested stock units that vest based on certain target performance and service conditions. The number of non-vested stock units underlying the award will be determined within sixty days of the three -year performance period ending December 31, 2019. The attainment level under the award will be based on the Company's relative total return to stockholders over the performance period compared to a pre-established custom index group. If the Company’s relative total return to stockholders is between the 41st percentile and the 80th percentile when compared to the index companies, the number of non-vested stock units earned will be based on interpolation. The maximum number of non-vested stock units that may vest pursuant to the awards is capped at 200% of the target number of non-vested stock units set forth in the award agreement and is earned if the Company's relative total return to stockholders when compared to the index companies is at or greater than the 80th percentile. If the Company’s total return to stockholders is negative, the number of non-vested stock units earned will be no more than 100% regardless of the Company’s relative total return to stockholders compared to the index companies. If the awardee is not employed by the Company at the end of the performance period, the extent to which the awardee will vest in the award, if at all, is dependent upon the timing and character of the termination as provided in the award agreement. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company's common stock. In January 2016, the Company granted its former Chief Executive Officer 220,235 non-vested stock units that vest based on certain target performance conditions; and in March 2016, the Company granted senior level employees 234,816 non-vested stock units that vest based on certain target performance conditions. These awards were modified as described above as a result of the Spin-off. The attainment level under the awards will be based on the Company's compound annualized total return to stockholders over a three -year performance period, with 100% of such stock units earned if the Company achieves total shareholder return of 10% over the performance period. Further, if the Company achieves annualized total shareholder return of less than 10% during the performance period, the awardees may earn all or a portion of the target award, but not in excess of 100% of such stock units, depending upon the Company’s relative total shareholder return compared to companies listed in the S&P Computer Software Select Index. If the Company's compound annualized total shareholder return is 5% or above, the number of non-vested stock units earned will be based on interpolation, with the maximum number of non-vested stock units earned capped at 200% of the target number of non-vested stock units for a compound annualized total return to stockholders of 30% over a three-year performance period as set forth in the award agreement. Within sixty days following an interim measurement period of 18 months, the Compensation Committee will determine the number of restricted stock units that would be deemed earned based on performance to date, and up to 33% of the target award may be earned based on such performance; however, any stock units that are deemed earned will remain subject to continued service vesting until the end of the three-year performance period, or a change in control, if earlier. Within sixty days following the conclusion of the performance period, the Company’s Compensation Committee will determine the number of restricted stock units that would vest upon the final day of the performance period based on the Company’s performance during the period and in accordance with the terms of the award. On the vesting date, the greater of the full period restricted stock units, or the interim earned restricted stock units, will vest in one installment. The market condition requirements are reflected in the grant date fair value of the award, and the compensation expense for the award will be recognized assuming that the requisite service is rendered regardless of whether the market conditions are achieved. The grant date fair value of the non-vested performance stock unit awards was determined through the use of a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements applicable to each award as follows: March 2017 Grant March 2016 Grant January 2016 Grant Expected volatility factor 0.27-0.32 0.29 - 0.39 0.29 - 0.37 Risk free interest rate 1.48 % 0.91 % 1.10 % Expected dividend yield 0 % 0 % 0 % For the March 2017 grant, the range of expected volatilities utilized was based on the historical volatilities of the Company's common stock and the average of its peer group. The Company chose to use historical volatility to value these awards because historical stock prices were used to develop the correlation coefficients between the Company and its peer group in order to model the stock price movements. The volatilities used were calculated over the most recent 2.75 year period, which is commensurate with the awards' performance period at the date of grant. The risk free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the performance period. The Company does not intend to pay dividends on its common stock in the foreseeable future. Accordingly, the Company used a dividend yield of zero in its model. The estimated fair value of each award as of the date of grant was $104.05 . For the March 2016 and January 2016 grants, the range of expected volatilities utilized was based on the historical volatilities of the Company's common stock and the average of its peer group. The Company chose to use historical volatility to value these awards because historical stock prices were used to develop the correlation coefficients between the Company and its peer group in order to model the stock price movements. The volatilities used were calculated over a three year period, which is commensurate with the awards’ performance period at the date of grant. The risk free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the performance period. The Company does not intend to pay dividends on its common stock in the foreseeable future. Accordingly, the Company used a dividend yield of zero in its model. The estimated fair value of each award as of the date of grant was $66.18 for the March 2016 grant and $49.68 for the January 2016 grant. Service Based Stock Units The Company also awards senior level employees, certain other employees and new non-employee directors, non-vested stock units granted under the 2014 Plan that vest based on service. The majority of these non-vested stock unit awards generally vest 33.33% on each anniversary subsequent to the date of the award. The Company also assumes non-vested stock units in connection with certain of its acquisitions. The assumed awards have the same three year vesting schedule. 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. These awards vest monthly in 12 equal installments based on service and, upon vesting, each stock unit represents the right to receive one share of the Company's common stock. Unrecognized Compensation Related to Stock Units As of June 30, 2017 , the number of all non-vested stock units outstanding, including market performance and service condition awards and service-based awards, including service-based awards assumed in connection with acquisitions, were 5,152,745 . As of June 30, 2017 , there was $296.9 million of total unrecognized compensation cost related to non-vested stock units. The unrecognized cost is expected to be recognized over a weighted-average period of 2.26 years. Non-vested Stock During the six months ended June 30, 2016 , the Company granted non-vested stock awards of 118,588 shares to its former Chief Executive Officer, with a vesting period of approximately three years from the date of grant, subject to the holder’s continued employment with the Company and accelerated vesting under certain circumstances. Non-vested stock is issued and outstanding upon grant; however, award holders are restricted from selling the shares until they vest. If the vesting conditions are not met, the award will be forfeited. Compensation expense is measured based on the closing market price of the Company’s common stock at the date of grant and is recognized on a straight-line basis over the vesting period. For the three and six months ended June 30, 2017 , the Company recognized $0.7 million and $1.3 million , respectively, of stock-based compensation expense related to non-vested stock awards. At June 30, 2017 , there was $4.0 million of total unrecognized compensation expense related to these awards, which is expected to be recognized during the third quarter of 2017.

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	6 Months Ended
	Jun. 30, 2017
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. As part of its continued transformation, effective January 1, 2016, the Company reorganized a part of its business by creating a new Data (formerly Cloud) product grouping. In connection with this change, during the fourth quarter of 2016, the Company performed an assessment of its goodwill reporting units and determined that the reorganization resulted in the identification of two goodwill reporting units (excluding the GoTo Business). 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 2016 . On January 31, 2017, the Company completed the Spin-off of the GoTo Business and $380.9 million of the goodwill attributable to the GoTo Business as of December 31, 2016 was distributed to GetGo. As a result of the Spin-off, the Company performed an assessment of the two remaining goodwill reporting units for the quarter ended March 31, 2017 and determined that these goodwill reporting units remain unchanged. There were no changes in reporting units nor indicators of impairment during the three months ended June 30, 2017 . See Note 5 for more information regarding the Company's acquisitions. The following table presents the change in goodwill during the three and six months ended June 30, 2017 (in thousands): Balance at January 1, 2017 Additions Other Balance at June 30, 2017 Goodwill $ 1,585,893 $ 31,212 (1) $ — $ 1,617,105 (1) Amount relates to preliminary purchase price allocation of goodwill associated with the 2017 Business Combination. See Note 5 for more information regarding the Company's acquisitions. 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 to seven years, except for patents, which are amortized over the lesser of their remaining life or ten years. In-process R&D is initially capitalized at fair value as an intangible asset with an indefinite life and assessed for impairment thereafter. When in-process R&D projects are completed, the corresponding amount is reclassified as an amortizable intangible asset and is amortized over the asset's estimated useful life. Intangible assets consist of the following (in thousands): June 30, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Product related intangible assets $ 690,060 $ 546,244 $ 647,594 $ 520,746 Other 227,932 184,198 223,692 176,859 Total $ 917,992 $ 730,442 $ 871,286 $ 697,605 Amortization of product-related intangible assets, which consists primarily of product-related technologies and patents, was $12.4 million and $14.4 million for the three months ended June 30, 2017 and 2016 , respectively, and $25.5 million and $28.4 million for the six months ended June 30, 2017 and 2016 , respectively, 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 $3.7 million and $3.8 million for the three months ended June 30, 2017 and 2016 , respectively, and $7.3 million and $7.5 million for the six months ended June 30, 2017 and 2016 , respectively, 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 that an 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. Estimated future amortization expense of intangible assets with finite lives as of June 30, 2017 is as follows (in thousands): Year ending December 31, Amount 2017 (remaining six months) $ 31,886 2018 59,636 2019 39,010 2020 24,851 2021 8,890 Thereafter 23,277 Total $ 187,550

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION On January 31, 2017, Citrix completed the Spin-off of the GoTo Business. As a result, the Company re-evaluated its operating segments in the first quarter of 2017, and determined that it 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. During the first quarter of 2017, the Company classified the results of the GoTo Business, formerly a reportable segment, as discontinued operations in its financial statements for all periods presented. See Note 3 for more information regarding discontinued operations. On July 7, 2017, the Company's board of directors appointed David J. Henshall, formerly the chief financial officer and chief operating officer of the Company, as the Company's president, chief executive officer and a member of the board of directors. In connection with this change, the Company will reevaluate its segments during the third quarter of 2017. Revenues by Product Grouping Revenues by product grouping were as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Net revenues: Workspace Services revenues (1) $ 420,908 $ 410,426 $ 820,412 $ 809,940 Networking revenues (2) 196,876 194,898 390,296 390,368 Data revenues (3) 43,614 33,748 83,649 64,882 Professional services (4) 31,829 34,915 61,547 67,570 Total net revenues $ 693,227 $ 673,987 $ 1,355,904 $ 1,332,760 (1) Workspace Services revenues are primarily comprised of sales from the Company’s application virtualization products, which include XenDesktop and XenApp, and the Company's enterprise mobility management products, which include XenMobile and related license updates and maintenance and support. (2) Networking revenues primarily include NetScaler ADC and NetScaler SD-WAN, and related license updates and maintenance and support. (3) Data revenues primarily include ShareFile, Podio and Citrix Cloud. (4) Professional services revenues are primarily comprised of revenues from consulting services 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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Net revenues: Americas $ 403,072 $ 402,684 $ 794,418 $ 791,370 EMEA 217,313 205,064 419,165 411,995 Asia-Pacific 72,842 66,239 142,321 129,395 Total net revenues $ 693,227 $ 673,987 $ 1,355,904 $ 1,332,760

Convertible Senior Notes

Convertible Senior Notes	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
CONVERTIBLE SENIOR NOTES	CONVERTIBLE SENIOR NOTES Convertible Notes Offering During 2014, the Company completed a private placement of approximately $1.44 billion principal amount of 0.500% Convertible Notes due 2019. The net proceeds from this offering were approximately $1.42 billion , after deducting the initial purchasers’ discounts and commissions and the estimated offering expenses payable by the Company. The Company used approximately $82.6 million of the net proceeds to pay the cost of the Bond Hedges described below (after such cost was partially offset by the proceeds to the Company from the Warrant Transactions described below). The Company used the remainder of the net proceeds from the offering and a portion of its existing cash and investments to purchase an aggregate of approximately $1.5 billion of its common stock, as authorized under its share repurchase program. The Company used approximately $101.0 million to purchase shares of common stock from certain purchasers of the Convertible Notes in privately negotiated transactions concurrently with the closing of the offering, and the remaining $1.4 billion to purchase additional shares of common stock through an Accelerated Share Repurchase ("ASR") which the Company entered into with Citibank, N.A. (the “ASR Counterparty”) on April 25, 2014 (the “ASR Agreement”). The Convertible Notes are governed by the terms of an indenture, dated as of April 30, 2014 (the “Indenture”), between the Company and Wilmington Trust, National Association, as trustee (the “Trustee”). The Convertible Notes are the senior unsecured obligations of the Company and bear interest at a rate of 0.500% per annum, payable semi-annually in arrears on April 15 and October 15 of each year. The Convertible Notes will mature on April 15, 2019, unless earlier repurchased or converted. Upon conversion, the Company will pay cash up to the aggregate principal amount of the Convertible Notes to be converted and pay or deliver, as the case may be, cash, shares of common stock or a combination of cash and shares of common stock, at the Company’s election, in respect of the remainder, if any, of the Company’s conversion obligation in excess of the aggregate principal amount of the Convertible Notes being converted. The initial conversion rate for the Convertible Notes was 11.1111 shares of common stock per $1,000 principal amount of Convertible Notes, which corresponds to a conversion price of $90.00 per share of common stock. The conversion rate is subject to adjustment from time to time upon the occurrence of certain events, including, but not limited to, the issuance of certain stock dividends on common stock, the issuance of certain rights or warrants, subdivisions, combinations, distributions of capital stock, indebtedness, or assets, the payment of cash dividends and certain issuer tender or exchange offers. As a result of the Spin-off, the conversion rate for the Convertible Notes was adjusted under the terms of the Indenture. As a result of this adjustment, the conversion rate for the Convertible Notes was re-set as of the opening of business on February 1, 2017 to 13.9061 shares of the Company’s common stock per $1,000 principal amount of Convertible Notes, which corresponds to a conversion price of $71.91 per share of common stock. Similar adjustments were made to the conversion rates for the Convertible Note Hedge and Warrant Transactions (as defined below) as of the opening of business on February 1, 2017. The Company may not redeem the Convertible Notes prior to the maturity date and no “sinking fund” is provided for the Convertible Notes, which means that the Company is not required to periodically redeem or retire the Convertible Notes. Upon the occurrence of certain fundamental changes involving the Company, holders of the Convertible Notes may require the Company to repurchase for cash all or part of their Convertible Notes in principal amounts of $1,000 or an integral multiple thereof at a repurchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In accounting for the issuance of the Convertible Notes, the Company separated the Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the estimated fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the face value of the Convertible Notes as a whole. The excess of the principal amount of the liability component over its carrying amount ("debt discount") is amortized to interest expense over the term of the Convertible Notes using the effective interest method with an effective interest rate of 3.0 percent per annum. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the transaction costs related to the Convertible Note issuance, the Company allocated the total amount incurred to the liability and equity components based on their relative values. Issuance costs attributable to the $1.4 billion liability component are being amortized to expense over the term of the Convertible Notes, and issuance costs attributable to the equity component are included along with the equity component in stockholders' equity. Additionally, a deferred tax liability of $8.2 million related to a portion of the equity component transaction costs which are deductible for tax purposes is included in Other liabilities in the accompanying condensed consolidated balance sheets. As a result of the structure of the Reverse Morris Trust (RMT) transaction with LogMeIn, Inc., and the notification on October 10, 2016 to noteholders in accordance with the Indenture, the Convertible Notes became convertible until the earlier of (1) the close of business on the business day immediately preceding the ex-dividend date for the distribution of the outstanding shares of GetGo common stock to the Company’s stockholders by way of a pro rata dividend, and (2) the Company’s announcement that such distribution will not take place, even though the Convertible Notes were not otherwise convertible at December 31, 2016. The $1.44 billion Convertible Notes became convertible with the notice to noteholders. Accordingly, as of December 31, 2016, the carrying amount of the Convertible Notes of $1.3 billion was reclassified from Other liabilities to Current liabilities and the difference between the face value and carrying value of $79.5 million was reclassified from stockholders’ equity to temporary equity in the accompanying condensed consolidated balance sheets. The conversion period terminated as of the close of business on January 31, 2017 in connection with the Spin-off. As a result, the Convertible Notes were reclassified to Other liabilities from Current liabilities, and the amount previously recorded as Temporary equity was reclassified to Stockholders' equity as of March 31, 2017. See Note 3 for more information on the Company's separation of its GoTo Business. The Convertible Notes consist of the following (in thousands): June 30, 2017 December 31, 2016 Liability component Principal $ 1,437,483 $ 1,437,500 Less: note discount and issuance costs (70,391 ) (89,344 ) Net carrying amount $ 1,367,092 $ 1,348,156 Equity component Temporary equity $ — $ 79,495 Additional paid-in capital 162,869 83,374 Total equity (including temporary equity) $ 162,869 $ 162,869 The following table includes total interest expense recognized related to the Convertible Notes (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Contractual interest expense $ 1,797 $ 1,797 $ 3,594 $ 3,594 Amortization of debt issuance costs 1,039 1,015 2,071 2,024 Amortization of debt discount 8,472 8,222 16,882 16,383 $ 11,308 $ 11,034 $ 22,547 $ 22,001 See Note 7 to the Company's condensed consolidated financial statements for fair value disclosures related to the Company's Convertible Notes. Convertible Note Hedge and Warrant Transactions In connection with the pricing 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"), with JPMorgan Chase Bank, National Association, London Branch; Goldman, Sachs & Co.; Bank of America, N.A.; and Royal Bank of Canada (the “Option Counterparties”) 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. As a result of the Spin-off, the number of shares of the Company's common stock covered by the Bond Hedges and Warrant Transactions were adjusted to approximately 20.0 million shares. The Bond Hedges are generally expected to reduce the potential dilution upon conversion of the Convertible Notes and/or offset any payments in cash, shares of common stock or a combination of cash and shares of common stock, at the Company’s election, that the Company is required to make in excess of the principal amount of the Convertible Notes upon conversion of any Convertible Notes, as the case may be, in the event that the market price per share of common stock, as measured under the terms of the Bond Hedges, is greater than the strike price of the Bond Hedges, which initially corresponds to the conversion price of the Convertible Notes and is subject to anti-dilution adjustments substantially similar to those applicable to the conversion rate of the Convertible Notes. The Warrant Transactions will separately have a dilutive effect to the extent that the market value per share of common stock, as measured under the terms of the Warrant Transactions, exceeds the applicable strike price of the warrants issued pursuant to the Warrant Transactions (the “Warrants”). The initial strike price of the Warrants is $120.00 per share. Subsequent to the Spin-off, the strike price of the Warrants was adjusted to a weighted-average strike price of $95.25 as of February 1, 2017. The Warrants will expire in ratable portions on a series of expiration dates commencing after the maturity of the Convertible Notes. The Bond Hedges and Warrants are not marked to market. The value of the Bond Hedges and Warrants were initially recorded in stockholders' equity and continue to be classified within stockholders' equity. As of June 30, 2017 , no warrants have been exercised. Aside from the initial payment of a premium to the Option Counterparties under the Bond Hedges, which amount is partially offset by the receipt of a premium under the Warrant Transactions, the Company is not required to make any cash payments to the Option Counterparties under the Bond Hedges and will not receive any proceeds if the Warrants are exercised.

Credit Facility

Credit Facility	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
CREDIT FACILITY	CREDIT FACILITY Effective January 7, 2015, the Company entered into a Credit Facility with a group of financial institutions (the “Lenders”). The Credit Facility provides for a five year revolving line of credit in the aggregate amount of $250.0 million , subject to continued covenant compliance. The Company may elect to increase the revolving credit facility by up to $250.0 million if existing or new lenders provide additional revolving commitments in accordance with the terms of the Credit Agreement. A portion of the revolving line of credit (i) in the aggregate amount of $25.0 million may be available for issuances of letters of credit and (ii) in the aggregate amount of $10.0 million may be available for swing line loans, as part of, not in addition to, the aggregate revolving commitments. The Credit Facility bears interest at LIBOR plus 1.10% and adjusts in the range of 1.00% to 1.30% above LIBOR based on the ratio of the Company’s total debt to its adjusted earnings before interest, taxes, depreciation, amortization and certain other items (“EBITDA”) as defined in the agreement. In addition, the Company is required to pay a quarterly facility fee ranging from 0.125% to 0.20% of the aggregate revolving commitments under the Credit Facility and based on the ratio of the Company’s total debt to the Company’s consolidated EBITDA. The weighted average interest rate for the period that amounts were outstanding under the Credit Facility was 1.96% . As of June 30, 2017 , there was $30.0 million outstanding under the Credit Facility. The Credit Agreement contains certain financial covenants that require the Company to maintain a consolidated leverage ratio of not more than 3.5 : 1.0 and a consolidated interest coverage ratio of not less than 3.0 : 1.0 . In addition, the Credit Agreement contains customary affirmative and negative covenants, including covenants that limit or restrict the ability of the Company to grant liens, merge, dissolve or consolidate, dispose of all or substantially all of its assets, pay dividends during the existence of a default under the Credit Agreement, change its business and incur subsidiary indebtedness, in each case subject to customary exceptions for a credit facility of this size and type. The Company was in compliance with these covenants as of June 30, 2017 .

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS Derivatives Designated as Hedging Instruments As of June 30, 2017 , 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. The change in the derivative component in Accumulated other comprehensive loss includes unrealized gains or losses that arose from changes in market value of the effective portion of derivatives that were held during the period, and gains or losses that were previously unrealized but have been recognized in the same line item as the forecasted transaction in current period net income due to termination or maturities of derivative contracts. This reclassification has no effect on total comprehensive income or equity. The total cumulative unrealized gain on cash flow derivative instruments was $2.4 million at June 30, 2017 , and is included in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets. The total cumulative unrealized loss on cash flow derivative instruments was $3.1 million at December 31, 2016 , and is included in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets. See Note 14 for more information related to comprehensive income. The net unrealized gain as of June 30, 2017 is expected to be recognized in income over the next 12 months at the same time the hedged items are recognized in 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, it 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 (expense) income, net . Fair Values of Derivative Instruments Asset Derivatives Liability Derivatives (In thousands) June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 Derivatives Designated as Hedging Instruments Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Foreign currency forward contracts Prepaid expenses and other current assets $2,791 Prepaid expenses and other current assets $460 Accrued expenses and other current liabilities $209 Accrued expenses and other current liabilities $3,816 Asset Derivatives Liability Derivatives (In thousands) June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 Derivatives Not Designated as Hedging Instruments Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Foreign currency forward contracts Prepaid expenses and other current assets $473 Prepaid expenses and other current assets $2,046 Accrued expenses and other current liabilities $780 Accrued expenses and other current liabilities $619 The Effect of Derivative Instruments on Financial Performance For the Three Months Ended June 30, 2017 (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) Location of (Loss) Gain Reclassified Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2017 2016 2017 2016 Foreign currency forward contracts $ 1,890 $ (2,360 ) Operating expenses $ (6 ) $ 142 For the Six Months Ended June 30, 2017 (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain Recognized in Other Comprehensive Income (Effective Portion) Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2017 2016 2017 2016 Foreign currency forward contracts $ 5,554 $ 1,027 Operating expenses $ (1,678 ) $ (1,023 ) There was no material ineffectiveness in the Company’s foreign currency hedging program in the periods presented. For the Three Months Ended June 30, 2017 (In thousands) Derivatives Not Designated as Hedging Instruments Location of Loss Recognized in Income on Derivative Amount of Loss Recognized in Income on Derivative 2017 2016 Foreign currency forward contracts Other (expense) income, net $ (2,064 ) $ (1,992 ) For the Six Months Ended June 30, 2017 (In thousands) Derivatives Not Designated as Hedging Instruments Location of Loss Recognized in Income on Derivative Amount of Loss Recognized in Income on Derivative 2017 2016 Foreign currency forward contracts Other (expense) income, net $ (5,150 ) $ (3,965 ) Outstanding Foreign Currency Forward Contracts As of June 30, 2017 , the Company had the following net notional foreign currency forward contracts outstanding (in thousands): Foreign Currency Currency Denomination Australian Dollar AUD 5,600 Brazilian Real BRL 11,200 Pounds Sterling GBP 7,400 Canadian Dollar CAD 2,350 Chinese Yuan Renminbi CNY 60,687 Danish Krone DKK 8,264 Euro EUR 4,678 Hong Kong Dollar HKD 26,000 Indian Rupee INR 205,765 Japanese Yen JPY 1,587,000 Singapore Dollar SGD 10,400 Swiss Franc CHF 16,550

Comprehensive Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2017
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) gain on available-for-sale securities Unrealized (loss) gain on derivative instruments Other comprehensive loss on pension liability Total (In thousands) Balance at December 31, 2016 $ (16,346 ) $ (3,108 ) $ (3,130 ) $ (6,120 ) $ (28,704 ) Other comprehensive income before reclassifications — 1,440 3,876 — 5,316 Amounts reclassified from accumulated other comprehensive loss — (460 ) 1,678 (9 ) 1,209 Net current period other comprehensive income — 980 5,554 (9 ) 6,525 Distribution of the GoTo Business $ 13,400 $ — $ — $ — $ 13,400 Balance at June 30, 2017 $ (2,946 ) $ (2,128 ) $ 2,424 $ (6,129 ) $ (8,779 ) Income tax expense or benefit allocated to each component of other comprehensive income (loss) is not material. Reclassifications out of Accumulated other comprehensive loss are as follows: For the Three Months Ended June 30, 2017 (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 $ (85 ) Other (expense) income, net Unrealized net losses on cash flow hedges 6 Operating expenses * $ (79 ) For the Six Months Ended June 30, 2017 (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 $ (460 ) Other (expense) income, net Unrealized net losses on cash flow hedges 1,678 Operating expenses * $ 1,218 * Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
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 does not expect to remit earnings from its foreign subsidiaries. In March 2016, the Financial Accounting Standards Board issued an accounting standard update on the accounting of stock-based compensation to provide guidance that changes the accounting for certain aspects of share-based payments to employees. The guidance requires, among other things, the recognition of the income tax effects of awards in the income statement when the awards vest or are settled, thus eliminating additional paid-in capital pools. The Company adopted this standard in the first quarter of 2017 . There was no material impact upon adoption of this guidance since the recognition of income tax effects of awards was not materially different from amounts previously recorded in the Company's financial statements. The Company’s continuing operations effective tax rate was 4.8% and 16.1% for the three months ended June 30, 2017 and 2016 , respectively. The decrease in the effective tax rate when comparing the three months ended June 30, 2017 to the three months ended June 30, 2016 was in part due to a change in the combination of income between the Company’s U.S. and foreign operations. The decrease was also due to a $9.8 million net tax benefit primarily related to an international statutory tax transaction recognized in the three months ended June 30, 2017. The Company’s continuing operations effective tax rate was 23.6% and 15.9% for the six months ended June 30, 2017 and June 30, 2016 , respectively. The increase in the effective tax rate when comparing the six months ended June 30, 2017 to the six months ended June 30, 2016 was primarily due to certain items in the six months ended June 30, 2017. These amounts include a $46.1 million income tax charge to establish a valuation allowance due to a change in expectation of realizability of state R&D credits arising from the separation of the GoTo Business. This charge was partially offset by an $18.5 million benefit due to the adoption of the accounting standard update requiring recognition of income tax effects related to stock-based compensation when the awards vest or settle. This charge was also partially offset by a $9.8 million net tax benefit primarily related to an international statutory tax transaction. The Company’s net unrecognized tax benefits totaled $76.1 million and $69.8 million as of June 30, 2017 and December 31, 2016 , respectively. All amounts included in the balance at June 30, 2017 for tax positions would affect the annual effective tax rate if recognized. The Company has $3.4 million accrued for the payment of interest and penalties as of June 30, 2017 . 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 no longer subject to U.S. federal income tax examination. With few exceptions, the Company is generally not under examination for state and local income tax, or non-U.S. jurisdictions by tax authorities for years prior to 2013. In the ordinary course of global business, there are transactions for which the ultimate tax outcome is uncertain; thus, judgment is required in determining the worldwide provision for income taxes. The Company provides for income taxes on transactions based on its estimate of the probable liability. The Company adjusts its provision as appropriate for changes that impact its underlying judgments. Changes that impact provision estimates include such items as jurisdictional interpretations on tax filing positions based on the results of tax audits and general tax authority rulings. Due to the evolving nature of tax rules combined with the large number of jurisdictions in which the Company operates, it is possible that the Company’s estimates of its tax liability and the realizability of its deferred tax assets could change in the future, which may result in additional tax liabilities and adversely affect the Company’s results of operations, financial condition or cash flows. At June 30, 2017 , the Company had $176.5 million in net deferred tax assets from continuing operations. 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. The Company’s effective tax rate generally differs from the U.S. federal statutory rate of 35% due primarily to lower tax rates on earnings generated by the Company’s foreign operations that are taxed primarily in Switzerland. The Company has not provided for U.S. taxes for those earnings because it plans to reinvest all of those earnings indefinitely outside the United States. From time to time, there may be other items that impact the Company's effective tax rate, such as the items specific to the current period discussed above.

Treasury Stock

Treasury Stock	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
TREASURY STOCK	TREASURY STOCK Stock Repurchase Program The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $6.8 billion , of which $500.0 million was approved in January 2017. 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 June 30, 2017 , $404.0 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 offering, as well as proceeds from employee stock option exercises and the related tax benefit. The Company is authorized to make open market 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. During the three months ended June 30, 2017 , the Company had no open market purchases. During the six months ended June 30, 2017 , the Company expended $500.0 million on open market purchases under the stock repurchase program, repurchasing 6,399,499 shares of outstanding common stock at an average price of $78.13 . During the three months ended June 30, 2016 , the Company had no open market purchases. During the six months ended June 30, 2016 , the Company expended $28.7 million on open market purchases under the stock repurchase program, repurchasing 426,300 shares of outstanding common stock at an average price of $67.30 . Shares for Tax Withholding During the three months ended June 30, 2017 , the Company withheld 43,446 shares from equity awards that vested, totaling $3.6 million , to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. During the six months ended June 30, 2017 , the Company withheld 734,600 shares from stock units that vested, totaling $60.5 million , to satisfy minimum tax withholding obligations that arose on the vesting of stock units. During the three months ended June 30, 2016 , the Company withheld 134,771 shares from equity awards that vested, totaling $11.0 million , to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. During the six months ended June 30, 2016 , the Company withheld 563,609 shares from stock units that vested, totaling $43.9 million , to satisfy minimum tax withholding obligations that arose on the vesting of stock units. 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	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Leases The Company leases certain office space and equipment under various operating leases. In addition to rent, the leases require the Company to pay for taxes, insurance, maintenance and other operating expenses. Certain of these leases contain stated escalation clauses while others contain renewal options. The Company recognizes rent expense on a straight-line basis over the term of the lease, excluding renewal periods, unless renewal of the lease is reasonably assured. 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 claims, suits, assessments, investigations or legal proceedings change, changes in the Company's accrued liabilities would be recorded in the period in which such determination is made. For the matters referenced below, the amount of liability is not probable or the amount cannot be reasonably estimated; and, therefore, accruals have not been 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 alleging infringement by various Company products and services. The Company believes that it has meritorious defenses to the allegations made in its pending cases and intends to vigorously defend these lawsuits; 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 a defendant in various litigation matters generally arising out of the normal course of business. Although it is difficult to predict the ultimate outcomes of these cases, the Company believes that it is not reasonably possible that the ultimate outcomes will materially and adversely affect its business, financial position, results of operations or cash flows. 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 party. The Company has not made 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.

Restructuring

Restructuring	6 Months Ended
	Jun. 30, 2017
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. For the three and six months ended June 30, 2017 and June 30, 2016 , restructuring charges were comprised of the following (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Employee severance and related costs $ 2,107 $ 2,541 $ 8,553 $ 38,409 Consolidation of leased facilities 211 1,216 1,751 10,904 Reversal of previous charges (178 ) (177 ) (178 ) (177 ) Total Restructuring charges $ 2,140 $ 3,580 $ 10,126 $ 49,136 During the three and six months ended June 30, 2017 , the Company incurred costs of $1.8 million and $7.5 million , respectively, related to operational initiatives designed to improve infrastructure scalability and cost saving efficiencies. The charges primarily related to employee severance. Total charges related to this initiative are expected to be approximately $16.0 million . As of June 30, 2017 , total charges incurred since inception were $7.5 million . All remaining costs for the three and six months ended June 30, 2017 and 2016 relate to other restructuring plans, wherein the majority of the activities related to these previous programs are substantially complete. Restructuring accruals The activity in the Company’s restructuring accruals for the six months ended June 30, 2017 is summarized as follows (in thousands): Total Balance at January 1, 2017 $ 38,059 Restructuring charges 10,126 Payments (9,373 ) Balance at June 30, 2017 $ 38,812 As of June 30, 2017 , the $38.8 million in outstanding restructuring accruals primarily relate to future payments for leased facilities.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In January 2017, the Financial Accounting Standards Board issued an accounting standard update on the accounting for business combinations by clarifying the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The new guidance is effective for annual and interim periods beginning after December 15, 2017. The Company is currently evaluating the potential impact of this standard on its financial position and results of operations. In October 2016, the Financial Accounting Standards Board issued an accounting standard update on the accounting for income taxes, which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transaction occurs as opposed to deferring tax consequences and amortizing them into future periods. This update is effective for annual and interim periods beginning after December 15, 2017, with early adoption permitted. A modified retrospective approach with a cumulative-effect adjustment directly to retained earnings at the beginning of the period of adoption is required. The Company does not expect the adoption of this standard to have a material impact on its consolidated financial position or results of operations. In March 2016, the Financial Accounting Standards Board issued an accounting standard update on the accounting for stock-based compensation. The guidance requires the recognition of the income tax effects of awards in the income statement when the awards vest or are settled, thus eliminating additional paid in capital pools. The guidance also allows for the employer to repurchase more of an employee’s shares for tax withholding purposes without triggering liability accounting. In addition, the guidance allows for a policy election to account for forfeitures as they occur rather than on an estimated basis. The Company adopted this standard effective January 1, 2017. The impact of the adoption on the condensed consolidated financial statements was as follows: • Income tax accounting - The Company adopted the guidance related to the recognition of excess tax benefits and deficiencies as income tax expense or benefit in the Company's condensed consolidated statements of income on a prospective basis. The Company adopted on a modified retrospective basis the recognition of previously unrecognized excess tax benefits and recorded the cumulative effect of the change as a $0.4 million increase to Retained earnings with a corresponding adjustment to Deferred tax assets, net as of January 1, 2017. • Forfeitures - The Company elected to account for forfeitures as they occur on a modified retrospective basis, rather than estimate expected forfeitures and recorded the cumulative effect of the change as a $5.7 million decrease to Retained earnings as of January 1, 2017 with a corresponding adjustment to Additional paid-in capital. • Cash flow presentation - The Company elected to adopt the guidance related to the presentation of excess tax benefits in the condensed consolidated statements of cash flows on a prospective basis. The presentation requirements for cash flows related to employee taxes paid for withheld shares had no impact to any of the periods presented on the Company's condensed consolidated statements of cash flows since such cash flows have historically been presented as a financing activity. In February 2016, the Financial Accounting Standards Board issued an accounting standard update on the accounting of leases. The new guidance requires that lessees in a leasing arrangement recognize a right-of-use asset and a lease liability for most leases (other than leases that meet the definition of a short-term lease). The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. The new guidance is effective for annual reporting periods beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition, and provides for certain practical expedients. Transition will require application of the new guidance at the beginning of the earliest comparative period presented. The Company is currently evaluating the potential impact of this standard on its financial position and results of operations, however, it is expected to have a material impact. In July 2015, the Financial Accounting Standards Board issued an accounting standard update modifying the accounting for inventory. Under the new guidance, the measurement principle for inventory will change from lower of cost or market value to lower of cost and net realizable value. The standard defines net realizable value as the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The standard is applicable to inventory that is accounted for under the first-in, first-out method and is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years, with early adoption permitted. The Company adopted this standard effective January 1, 2017. The adoption of this guidance did not have a significant impact on the Company’s financial position or results of operations. In May 2014, the Financial Accounting Standards Board issued an accounting standard update on revenue recognition. The new guidance creates a single, principle-based model for revenue recognition and expands and improves disclosures about revenue. In July 2015, the Financial Accounting Standards Board issued an accounting standard update that defers the effective date of the new revenue recognition standard by one year. The new guidance is effective for annual reporting periods beginning on or after December 15, 2017, and must be adopted using either a full retrospective approach for all periods presented in the period of adoption or a modified retrospective approach. The Company has completed its assessment of its information technology systems, data and processes related to the implementation of this accounting standard. Additionally, the Company has substantially completed its information technology system design and solution development, and commenced implementation of the solution in the first quarter of fiscal year 2017. The Company expects to adopt the accounting standard update on a modified retrospective basis in the first quarter of fiscal year 2018, and is currently evaluating the potential impact of this standard on its financial position and results of operations. Under the new standard the Company expects to capitalize and amortize certain commissions over the expected customer life rather than expensing them as incurred. Additionally, under the new standard, the Company would be required to recognize term license revenues upfront at time of delivery rather than ratably over the related contract period. The Company expects revenue recognition related to perpetual software, hardware, cloud offerings and professional services to remain substantially unchanged. The Company is currently evaluating and developing internal controls during implementation to ensure its portfolio of contracts are adequately evaluated. The Company's internal controls will be modified and augmented, as necessary, upon adoption of the Company’s new revenue recognition policy effective January 1, 2018.

Significant Accounting Polici27

Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
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 the provision for doubtful accounts receivable, 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, 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 fair value of convertible senior notes, the provision for lease losses, the provision for income taxes and the amortization and depreciation periods for 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 as of June 30, 2017 and December 31, 2016 primarily consist of agency securities, corporate securities, municipal securities and government securities. Investments classified as available-for-sale 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 changes in the fair value of its available-for-sale investments in income unless a decline in value is considered other-than-temporary in accordance with the authoritative guidance. 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 investment information.
Revenue Recognition	Revenue Recognition Net revenues include the following categories: Product and licenses, SaaS, License updates and maintenance and Professional services. Product and licenses revenues primarily represent fees related to the licensing of the Company’s software and hardware appliances. These revenues are reflected net of sales allowances, cooperative advertising agreements, partner incentive programs and provisions for returns. SaaS revenues consist primarily of fees related to online service agreements, which are recognized ratably over the contract term. Should the Company charge set-up fees, they would be recognized ratably over the contract term or the expected customer life, whichever is longer. License updates and maintenance revenues consist of fees related to the Subscription Advantage program and maintenance fees, which include technical support and hardware and software maintenance. Subscription Advantage and maintenance fees are recognized ratably over the term of the contract, which is typically 12 to 24 months. The Company capitalizes certain third-party commissions related to Subscription Advantage, maintenance and support renewals. The capitalized commissions are amortized to Sales, marketing and services expense at the time the related deferred revenue is recognized as revenue. Hardware and software maintenance and support contracts are typically sold separately. Hardware maintenance includes technical support, the latest software upgrades when and if they become available, and replacement of malfunctioning appliances. Dedicated account management is available as an add-on to the program for a higher level of service. Software maintenance, including the new Customer Success Services, includes unlimited technical support, immediate access to software upgrades, enhancements and maintenance releases when and if they become available during the term of the contract and configuration and installation support along with acceleration and automation tools. Professional services revenues are comprised of fees from consulting services related to the implementation of the Company’s products and fees from product training and certification, which are recognized as the services are provided. The Company recognizes revenue when it is earned and when all of the following criteria are met: (1) persuasive evidence of the arrangement exists; (2) delivery has occurred or the service has been provided and the Company has no remaining obligations; (3) the fee is fixed or determinable; and (4) collectability is probable. The majority of the Company’s product and license revenue consists of revenue from the sale of software products. Software sales generally include a perpetual license to the Company’s software and is subject to the industry specific software revenue recognition guidance. In accordance with this guidance, the Company allocates revenue to license updates related to its stand-alone software and any other undelivered elements of the arrangement based on vendor specific objective evidence (“VSOE”) of fair value of each element and such amounts are deferred until the applicable delivery criteria and other revenue recognition criteria described above have been met. The balance of the revenues, net of any discounts inherent in the arrangement, is recognized at the outset of the arrangement using the residual method as the product licenses are delivered. If management cannot objectively determine the fair value of each undelivered element based on VSOE of fair value, revenue recognition is deferred until all elements are delivered, all services have been performed, or until fair value can be objectively determined. For hardware appliance and software transactions, the arrangement consideration is allocated to stand-alone software deliverables as a group and the non-software deliverables based on the relative selling prices using the selling price hierarchy in the revenue recognition guidance. The selling price hierarchy for a deliverable is based on its VSOE if available, third-party evidence of selling price ("TPE") if VSOE is not available, or estimated selling price ("ESP") if neither VSOE nor TPE is available. The Company then recognizes revenue on each deliverable in accordance with its policies for product and service revenue recognition. VSOE of selling price is based on the price charged when the element is sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices fall within a reasonable range based on historical discounting trends for specific products and services. TPE of selling price is established by evaluating competitor products or services in stand-alone sales to similarly situated customers. However, as the Company’s products contain a significant element of proprietary technology and its solutions offer substantially different features and functionality, the comparable pricing of products with similar functionality typically cannot be obtained. Additionally, as the Company is unable to reliably determine what competitors products’ selling prices are on a stand-alone basis, the Company is not typically able to determine TPE. The estimate of selling price is established considering multiple factors including, but not limited to, pricing practices in different geographies and through different sales channels and competitor pricing strategies. The Citrix Service Provider ("CSP") program provides subscription-based services in which the CSP partners host software services to their end users. The fees from the CSP program are recognized based on usage and as the CSP services are provided to their end users. For the Company’s non-software transactions, it allocates the arrangement consideration based on the relative selling price of the deliverables. For the Company’s hardware appliances, it uses ESP as its selling price. For the Company’s support and services, it generally uses VSOE as its selling price. When the Company is unable to establish selling price using VSOE for its support and services, the Company uses ESP in its allocation of arrangement consideration. The majority of the Company's SaaS offerings are considered hosted service arrangements per the authoritative guidance. In the normal course of business, the Company is not obligated to accept product returns from its resellers or end customers under any conditions, unless the product item is defective in manufacture. The Company establishes provisions for estimated returns, as well as other sales allowances, concurrently with the recognition of revenue. The provisions are established based upon consideration of a variety of factors, including, among other things, recent and historical return rates for both specific products and distributors and the impact of any new product releases and projected economic conditions. Product returns are provided for in the condensed consolidated financial statements and have historically been within management’s expectations. Allowances for estimated product returns amounted to $0.9 million and $2.0 million at June 30, 2017 and December 31, 2016 , respectively. The Company also records estimated reductions to revenue for customer programs and incentive offerings, including volume-based incentives. The Company could take actions to increase its customer incentive offerings, which could result in an incremental reduction to revenue at the time the incentive is offered.
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. Foreign currency transaction gains and losses are the result of exchange rate changes on transactions denominated in currencies other than the functional currency, including U.S. dollars. The remeasurement of those foreign currency transactions is included in determining net income or loss for the period of exchange. Prior to January 1, 2015, the functional currency of the Company’s wholly-owned foreign subsidiaries of its former GoTo Business was the currency of the country in which each subsidiary is located. The Company translated assets and liabilities of these foreign subsidiaries at exchange rates in effect at the balance sheet date and included accumulated net translation adjustments in equity as a component of Accumulated other comprehensive loss. As a result of the change in functional currency, the gains and losses that were previously recorded in Accumulated other comprehensive loss prior to January 1, 2015 were kept constant. As a result of the Spin-off , accumulated net translation adjustments associated with the GoTo Business recorded in Accumulated other comprehensive loss of $13.4 million were reclassified to Retained earnings during the period ended June 30, 2017 . See Note 3 for additional information regarding discontinued operations.
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.
Reclassifications	Reclassifications Certain reclassifications of the prior years' amounts have been made to conform to the current year's presentation.

Discontinued Operations (Tables

Discontinued Operations (Tables)	6 Months Ended
	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Discontinued Operations	Major classes of line items constituting Income (loss) from discontinued operations related to the GoTo Business Three Months Ended June 30, Six Months Ended June 30, 2016 2017 2016 (in thousands) Net revenues $ 168,993 $ 58,215 $ 335,898 Cost of net revenues 37,131 15,456 76,412 Gross margin 131,862 42,759 259,486 Operating expenses: Research and development 24,110 9,108 45,837 Sales, marketing and services 52,528 20,881 111,349 General and administrative 18,626 7,636 31,586 Amortization of other intangible assets 3,464 1,176 7,138 Restructuring 436 3,189 945 Separation 13,550 40,573 27,781 Total operating expenses 112,714 82,563 224,636 Income (loss) from discontinued operations before income taxes 19,148 (39,804 ) 34,850 Income tax expense 4,539 2,900 10,032 Income (loss) from discontinued operations, net of income tax $ 14,609 $ (42,704 ) $ 24,818 Carrying amounts of major classes of assets and liabilities included as part of discontinued operations related to the GoTo Business December 31, 2016 (in thousands) Assets Current assets: Cash $ 120,861 Accounts receivable, net 44,734 Prepaid expenses and other current assets 14,094 Total current assets of discontinued operations 179,689 Property and equipment, net 81,866 Goodwill 380,917 Other intangible assets, net 54,312 Deferred tax assets, net 18,496 Other assets 3,340 Long-term assets of discontinued operations $ 538,931 Total major classes of assets of discontinued operations $ 718,620 Liabilities Current liabilities: Accounts payable $ 11,333 Accrued expenses and other current liabilities 46,088 Current portion of deferred revenues 115,249 Total current liabilities of discontinued operations 172,670 Long-term portion of deferred revenues 4,224 Other liabilities 3,484 Long-term liabilities of discontinued operations $ 7,708 Total major classes of liabilities of discontinued operations $ 180,378

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
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 Six Months Ended June 30, June 30, 2017 2016 2017 2016 Numerator: Income from continuing operations $ 108,829 $ 106,289 $ 179,154 $ 179,543 Income (loss) from discontinued operations, net of income taxes — 14,609 (42,704 ) 24,818 Net income $ 108,829 $ 120,898 $ 136,450 $ 204,361 Denominator: Denominator for basic net earnings per share - weighted-average shares outstanding 151,212 154,998 152,247 154,485 Effect of dilutive employee stock awards 2,180 1,668 2,815 1,773 Effect of dilutive Convertible Notes 2,644 — 2,177 — Denominator for diluted net earnings per share - weighted-average shares outstanding 156,036 156,666 157,239 156,258 Basic earnings (loss) per share: Income from continuing operations $ 0.72 $ 0.69 $ 1.18 $ 1.16 Income (loss) from discontinued operations — 0.09 (0.28 ) 0.16 Basic net earnings per share $ 0.72 $ 0.78 $ 0.90 $ 1.32 Diluted earnings (loss) per share: Income from continuing operations $ 0.70 $ 0.68 $ 1.14 $ 1.15 Income (loss) from discontinued operations — 0.09 (0.27 ) 0.16 Diluted net earnings per share: $ 0.70 $ 0.77 $ 0.87 $ 1.31 Anti-dilutive weighted-average shares from stock awards 274 296 977 574

Acquisitions and Divestitures A

Acquisitions and Divestitures Acquisitions and Divestitures (Tables)	6 Months Ended
	Jun. 30, 2017
Business Combinations [Abstract]
Schedule of Allocation of Purchase Price	The purchase price for Unidesk was allocated to the acquired net tangible and intangible assets based on estimated fair values as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands): Unidesk Purchase Price Allocation Asset Life Current assets $ 5,321 Property and equipment 131 Intangible assets 39,470 4 years Goodwill 31,212 Indefinite Other assets 90 Assets acquired 76,224 Other current liabilities assumed 2,290 Current portion of deferred revenues 3,042 Long term portion of deferred revenues 2,412 Long-term liabilities assumed 4,086 Deferred taxes 1,247 Net assets acquired $ 63,147
Schedule of Intangible Assets Acquired	Identifiable intangible assets acquired in connection with the Unidesk acquisition (in thousands) and the weighted-average lives are as follows: Unidesk Asset Life Developed technology $ 35,230 4 years Customer contracts 4,240 4 years Total $ 39,470

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
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): June 30, 2017 December 31, 2016 Description of the Securities Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency securities $ 479,435 $ 625 $ (1,293 ) $ 478,767 $ 411,963 $ 699 $ (1,169 ) $ 411,493 Corporate securities 805,137 509 (1,164 ) 804,482 842,887 193 (2,114 ) 840,966 Municipal securities 3,965 12 — 3,977 9,989 3 (4 ) 9,988 Government securities 269,920 73 (743 ) 269,250 445,083 135 (600 ) 444,618 Total $ 1,558,457 $ 1,219 $ (3,200 ) $ 1,556,476 $ 1,709,922 $ 1,030 $ (3,887 ) $ 1,707,065

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2017
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 June 30, 2017 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Assets: Cash and cash equivalents: Cash $ 753,839 $ 753,839 $ — $ — Money market funds 89,406 89,406 — — Corporate securities 1,526 — 1,526 — Available-for-sale securities: Agency securities 478,767 — 478,767 — Corporate securities 804,482 — 804,088 394 Municipal securities 3,977 — 3,977 — Government securities 269,250 — 269,250 — Prepaid expenses and other current assets: Foreign currency derivatives 3,264 — 3,264 — Total assets $ 2,404,511 $ 843,245 $ 1,560,872 $ 394 Accrued expenses and other current liabilities: Foreign currency derivatives 989 — 989 — Total liabilities $ 989 $ — $ 989 $ — As of December 31, 2016 Quoted Prices In Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) (In thousands) Assets: Cash and cash equivalents: Cash $ 528,637 $ 528,637 $ — $ — Money market funds 224,765 224,765 — — Corporate securities 82,693 — 82,693 — Available-for-sale securities: Agency securities 411,493 — 411,493 — Corporate securities 840,966 — 839,968 998 Municipal securities 9,988 — 9,988 — Government securities 444,618 — 444,618 — Prepaid expenses and other current assets: Foreign currency derivatives 2,506 — 2,506 — Total assets $ 2,545,666 $ 753,402 $ 1,791,266 $ 998 Accrued expenses and other current liabilities: Foreign currency derivatives 4,435 — 4,435 — Total liabilities $ 4,435 $ — $ 4,435 $ —
Fair Value, by Balance Sheet Grouping	As of June 30, 2017 , the fair value of the Convertible Notes, which 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 June 30, 2017 , and carrying value of debt instruments (carrying value excludes the equity component of the Company’s Convertible Notes classified in equity) was as follows (in thousands): Fair Value Carrying Value Convertible Senior Notes $ 1,738,506 $ 1,367,092

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [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 its Employee Stock Purchase Plan awards with the following weighted-average assumptions: Six Months Ended June 30, 2017 June 30, 2016 Expected volatility factor 0.29 0.41 Risk free interest rate 0.60 % 0.35 % Expected dividend yield 0 % 0 % Expected life (in years) 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 Six Months Ended Income Statement Classifications June 30, 2017 June 30, 2016 June 30, 2017 June 30, 2016 Cost of services and maintenance revenues $ 815 $ 542 $ 1,407 $ 1,036 Research and development 11,660 9,689 21,326 17,444 Sales, marketing and services 14,728 12,560 26,325 23,504 General and administrative 13,476 15,576 26,429 32,444 Total $ 40,679 $ 38,367 $ 75,487 $ 74,428
Schedule of Assumptions Used to Value Nonvested Share Grants	The grant date fair value of the non-vested performance stock unit awards was determined through the use of a Monte Carlo simulation model, which utilized multiple input variables that determined the probability of satisfying the market condition requirements applicable to each award as follows: March 2017 Grant March 2016 Grant January 2016 Grant Expected volatility factor 0.27-0.32 0.29 - 0.39 0.29 - 0.37 Risk free interest rate 1.48 % 0.91 % 1.10 % Expected dividend yield 0 % 0 % 0 %

Goodwill And Other Intangible34

Goodwill And Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of The Change In Goodwill	The following table presents the change in goodwill during the three and six months ended June 30, 2017 (in thousands): Balance at January 1, 2017 Additions Other Balance at June 30, 2017 Goodwill $ 1,585,893 $ 31,212 (1) $ — $ 1,617,105 (1) Amount relates to preliminary purchase price allocation of goodwill associated with the 2017 Business Combination. See Note 5 for more information regarding the Company's acquisitions.
Schedule Of Intangible Assets	Intangible assets consist of the following (in thousands): June 30, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Product related intangible assets $ 690,060 $ 546,244 $ 647,594 $ 520,746 Other 227,932 184,198 223,692 176,859 Total $ 917,992 $ 730,442 $ 871,286 $ 697,605
Schedule Of Estimated Future Amortization Expense	Estimated future amortization expense of intangible assets with finite lives as of June 30, 2017 is as follows (in thousands): Year ending December 31, Amount 2017 (remaining six months) $ 31,886 2018 59,636 2019 39,010 2020 24,851 2021 8,890 Thereafter 23,277 Total $ 187,550

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Revenue by Product Grouping	Revenues by product grouping were as follows (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Net revenues: Workspace Services revenues (1) $ 420,908 $ 410,426 $ 820,412 $ 809,940 Networking revenues (2) 196,876 194,898 390,296 390,368 Data revenues (3) 43,614 33,748 83,649 64,882 Professional services (4) 31,829 34,915 61,547 67,570 Total net revenues $ 693,227 $ 673,987 $ 1,355,904 $ 1,332,760 (1) Workspace Services revenues are primarily comprised of sales from the Company’s application virtualization products, which include XenDesktop and XenApp, and the Company's enterprise mobility management products, which include XenMobile and related license updates and maintenance and support. (2) Networking revenues primarily include NetScaler ADC and NetScaler SD-WAN, and related license updates and maintenance and support. (3) Data revenues primarily include ShareFile, Podio and Citrix Cloud. (4) Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.
Revenue by Geographic Location	The following table presents revenues by geographic location, for the following periods (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Net revenues: Americas $ 403,072 $ 402,684 $ 794,418 $ 791,370 EMEA 217,313 205,064 419,165 411,995 Asia-Pacific 72,842 66,239 142,321 129,395 Total net revenues $ 693,227 $ 673,987 $ 1,355,904 $ 1,332,760

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Convertible Debt	The Convertible Notes consist of the following (in thousands): June 30, 2017 December 31, 2016 Liability component Principal $ 1,437,483 $ 1,437,500 Less: note discount and issuance costs (70,391 ) (89,344 ) Net carrying amount $ 1,367,092 $ 1,348,156 Equity component Temporary equity $ — $ 79,495 Additional paid-in capital 162,869 83,374 Total equity (including temporary equity) $ 162,869 $ 162,869
Schedule of Interest Expense Recognized Related to Convertible Notes	The following table includes total interest expense recognized related to the Convertible Notes (in thousands): Three Months Ended Six Months Ended June 30, June 30, 2017 2016 2017 2016 Contractual interest expense $ 1,797 $ 1,797 $ 3,594 $ 3,594 Amortization of debt issuance costs 1,039 1,015 2,071 2,024 Amortization of debt discount 8,472 8,222 16,882 16,383 $ 11,308 $ 11,034 $ 22,547 $ 22,001

Derivative Financial Instrume37

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
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) June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 Derivatives Designated as Hedging Instruments Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Foreign currency forward contracts Prepaid expenses and other current assets $2,791 Prepaid expenses and other current assets $460 Accrued expenses and other current liabilities $209 Accrued expenses and other current liabilities $3,816 Asset Derivatives Liability Derivatives (In thousands) June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 Derivatives Not Designated as Hedging Instruments Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Balance Sheet Location Fair Value Foreign currency forward contracts Prepaid expenses and other current assets $473 Prepaid expenses and other current assets $2,046 Accrued expenses and other current liabilities $780 Accrued expenses and other current liabilities $619
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	The Effect of Derivative Instruments on Financial Performance For the Three Months Ended June 30, 2017 (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion) Location of (Loss) Gain Reclassified Amount of (Loss) Gain Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2017 2016 2017 2016 Foreign currency forward contracts $ 1,890 $ (2,360 ) Operating expenses $ (6 ) $ 142 For the Six Months Ended June 30, 2017 (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain Recognized in Other Comprehensive Income (Effective Portion) Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2017 2016 2017 2016 Foreign currency forward contracts $ 5,554 $ 1,027 Operating expenses $ (1,678 ) $ (1,023 )
Schedule Of Effect Of Derivative Instruments On Financial Performance	For the Three Months Ended June 30, 2017 (In thousands) Derivatives Not Designated as Hedging Instruments Location of Loss Recognized in Income on Derivative Amount of Loss Recognized in Income on Derivative 2017 2016 Foreign currency forward contracts Other (expense) income, net $ (2,064 ) $ (1,992 ) For the Six Months Ended June 30, 2017 (In thousands) Derivatives Not Designated as Hedging Instruments Location of Loss Recognized in Income on Derivative Amount of Loss Recognized in Income on Derivative 2017 2016 Foreign currency forward contracts Other (expense) income, net $ (5,150 ) $ (3,965 )
Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding	As of June 30, 2017 , the Company had the following net notional foreign currency forward contracts outstanding (in thousands): Foreign Currency Currency Denomination Australian Dollar AUD 5,600 Brazilian Real BRL 11,200 Pounds Sterling GBP 7,400 Canadian Dollar CAD 2,350 Chinese Yuan Renminbi CNY 60,687 Danish Krone DKK 8,264 Euro EUR 4,678 Hong Kong Dollar HKD 26,000 Indian Rupee INR 205,765 Japanese Yen JPY 1,587,000 Singapore Dollar SGD 10,400 Swiss Franc CHF 16,550

Comprehensive Income (Tables)

Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2017
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) gain on available-for-sale securities Unrealized (loss) gain on derivative instruments Other comprehensive loss on pension liability Total (In thousands) Balance at December 31, 2016 $ (16,346 ) $ (3,108 ) $ (3,130 ) $ (6,120 ) $ (28,704 ) Other comprehensive income before reclassifications — 1,440 3,876 — 5,316 Amounts reclassified from accumulated other comprehensive loss — (460 ) 1,678 (9 ) 1,209 Net current period other comprehensive income — 980 5,554 (9 ) 6,525 Distribution of the GoTo Business $ 13,400 $ — $ — $ — $ 13,400 Balance at June 30, 2017 $ (2,946 ) $ (2,128 ) $ 2,424 $ (6,129 ) $ (8,779 )
Schedule of reclassification out of accumulated other comprehensive income	Reclassifications out of Accumulated other comprehensive loss are as follows: For the Three Months Ended June 30, 2017 (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 $ (85 ) Other (expense) income, net Unrealized net losses on cash flow hedges 6 Operating expenses * $ (79 ) For the Six Months Ended June 30, 2017 (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 $ (460 ) Other (expense) income, net Unrealized net losses on cash flow hedges 1,678 Operating expenses * $ 1,218 * Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Restructuring (Tables)

Restructuring (Tables)	6 Months Ended
	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Charges by Segment	For the three and six months ended June 30, 2017 and June 30, 2016 , restructuring charges were comprised of the following (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Employee severance and related costs $ 2,107 $ 2,541 $ 8,553 $ 38,409 Consolidation of leased facilities 211 1,216 1,751 10,904 Reversal of previous charges (178 ) (177 ) (178 ) (177 ) Total Restructuring charges $ 2,140 $ 3,580 $ 10,126 $ 49,136
Schedule of Restructuring Accruals	The activity in the Company’s restructuring accruals for the six months ended June 30, 2017 is summarized as follows (in thousands): Total Balance at January 1, 2017 $ 38,059 Restructuring charges 10,126 Payments (9,373 ) Balance at June 30, 2017 $ 38,812

Background and Basis of Prese40

Background and Basis of Presentation (Details) - GetGo, Inc. [Member]	Jan. 31, 2017shares
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pro rata distribution of the common stock of GetGo to stockholders, percent	100.00%
Share issued in acquisitions (shares)	26,900,000
Common stock conversion ratio	1
LogMeIn shares received in disposal of GetGo	26,900,000
LogMeIn shares received in disposal as percent of Comany share outstanding (percent)	0.171844291
Fractional shares of LogMeIn received (shares)	0

Significant Accounting Polici41

Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Allowance for estimated product returns	$ 900	$ 2,000
Accumulated other comprehensive loss reclassified to retained earnings as a result of the separation of the GoTo Business	$ 13,400
Minimum [Member] | License Update [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition, period for recognition	12 months
Maximum [Member] | License Update [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition, period for recognition	24 months
Accumulated Foreign Currency Adjustment [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Accumulated other comprehensive loss reclassified to retained earnings as a result of the separation of the GoTo Business	$ 13,400

Discontinued Operations - Incom

Discontinued Operations - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income tax	$ 0	$ 14,609	$ (42,704)	$ 24,818
Separation costs	$ 200	400	500	800
GoTo Business Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues		168,993	58,215	335,898
Cost of net revenues		37,131	15,456	76,412
Gross margin		131,862	42,759	259,486
Research and development		24,110	9,108	45,837
Sales, marketing and services		52,528	20,881	111,349
General and administrative		18,626	7,636	31,586
Amortization of other intangible assets		3,464	1,176	7,138
Restructuring		436	3,189	945
Separation		13,550	40,573	27,781
Total operating expenses		112,714	82,563	224,636
Income (loss) from discontinued operations before income taxes		19,148	(39,804)	34,850
Income tax expense		4,539	2,900	10,032
Income (loss) from discontinued operations, net of income tax		$ 14,609	$ (42,704)	$ 24,818

Discontinued Operations - Balan

Discontinued Operations - Balance Sheet Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	$ 0	$ 71,126		$ 120,861	$ 57,762
Total current assets of discontinued operations	0			179,689
Long-term assets of discontinued operations	0			538,931
Total current liabilities of discontinued operations	0			172,670
Long-term liabilities of discontinued operations	0			7,708
Reduction to retained earnings	(3,663,732)			(4,010,737)
Transfer of Cash	28,523	$ 0
Accumulated other comprehensive loss associated with foreign currency translation adjustments reclassified to retained earnings	13,400
GoTo Business Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash				120,861
Accounts receivable, net				44,734
Prepaid expenses and other current assets				14,094
Total current assets of discontinued operations				179,689
Property and equipment, net				81,866
Goodwill				380,917
Other intangible assets, net				54,312
Deferred tax assets, net				18,496
Other assets				3,340
Long-term assets of discontinued operations				538,931
Total major classes of assets of discontinued operations				718,620
Accounts payable				11,333
Accrued expenses and other current liabilities				46,088
Current portion of deferred revenues				115,249
Total current liabilities of discontinued operations				172,670
Long-term portion of deferred revenues				4,224
Other liabilities				3,484
Long-term liabilities of discontinued operations				7,708
Total major classes of liabilities of discontinued operations				$ 180,378
Reduction to retained earnings			$ 478,200
Reduction to net assets			$ 464,800
Accumulated Foreign Currency Adjustment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss associated with foreign currency translation adjustments reclassified to retained earnings	13,400
Accumulated Foreign Currency Adjustment [Member] | GoTo Business Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss associated with foreign currency translation adjustments reclassified to retained earnings	$ 13,400

Earnings Per Share (Details)

Earnings Per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	Feb. 01, 2017$ / shares	Jan. 31, 2017$ / shares	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016USD ($)$ / sharesshares	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 30, 2016USD ($)$ / sharesshares
Numerator:
Income from continuing operations | $			$ 108,829	$ 106,289	$ 179,154	$ 179,543
Income (loss) from discontinued operations, net of income taxes | $			0	14,609	(42,704)	24,818
Net income | $			$ 108,829	$ 120,898	$ 136,450	$ 204,361
Denominator:
Denominator for basic net earnings per share - weighted-average shares outstanding (shares) | shares			151,212	154,998	152,247	154,485
Effect of dilutive employee stock awards (shares) | shares			2,180	1,668	2,815	1,773
Effect of dilutive Convertible Notes (shares) | shares			2,644	0	2,177	0
Denominator for net diluted earnings per share - weighted-average shares outstanding (shares) | shares			156,036	156,666	157,239	156,258
Income from continuing operations, basic (in dollars per share)			$ 0.72	$ 0.69	$ 1.18	$ 1.16
Income (loss) from discontinued operations, basic (in dollars per share)			0	0.09	(0.28)	0.16
Basic earnings per share (in dollars per share)			0.72	0.78	0.90	1.32
Income from continuing operations, diluted (in dollars per share)			0.70	0.68	1.14	1.15
Income (loss) from discontinued operations, diluted (in dollars per share)			0	0.09	(0.27)	0.16
Diluted earnings per share (in dollars per share)			$ 0.70	$ 0.77	$ 0.87	$ 1.31
Anti-dilutive weighted-average shares from stock awards (shares) | shares			274	296	977	574
Senior Notes Due 2019 [Member]
Denominator:
Convertible debt, conversion price (in dollars per share)	$ 71.91	$ 90
Convertible debt, conversion ratio	0.0139061	0.011111
GetGo, Inc. [Member]
Denominator:
Convertible debt, conversion price (in dollars per share)	$ 71.91
Convertible debt, conversion ratio	0.0139061

Acquisitions and Divestitures (

Acquisitions and Divestitures (Narrative) (Details) - USD ($)	Jan. 03, 2017	Sep. 07, 2016	Feb. 29, 2016	Jan. 08, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Revenue period for earnout provision			5 years
Earnout income recognized					$ 0		$ 0
Goodwill					1,617,105,000		1,617,105,000		$ 1,585,893,000
Unidesk Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years
Preliminary consideration	$ 60,400,000
Cash acquired in business combination	2,700,000
Transaction costs	400,000
Goodwill	$ 31,212,000
Norskale [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration		$ 11,500,000
Cash acquired in business combination		800,000
Transaction costs		400,000
Acquisition related costs					0	$ 100,000	0	$ 100,000
Goodwill		4,700,000
2016 Asset Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired				$ 23,600,000
General and Administrative Expense [Member] | Unidesk Corporation [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition related costs					$ 0		$ 100,000
Core and Product Technologies [Member] | Norskale [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired		$ 8,200,000
Weighted average useful life		4 years

Acquisitions and Divestitures -

Acquisitions and Divestitures - Schedule of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Jan. 03, 2017	Jun. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 1,617,105	$ 1,585,893
Unidesk Corporation [Member]
Business Acquisition [Line Items]
Current assets	$ 5,321
Property and equipment	131
Intangible assets	39,470
Goodwill	31,212
Other assets	90
Assets acquired	76,224
Other current liabilities assumed	2,290
Current portion of deferred revenues	3,042
Long term portion of deferred revenues	2,412
Long-term liabilities assumed	4,086
Deferred taxes	1,247
Net assets acquired	$ 63,147
Weighted average useful life	4 years

Acquisitions and Divestitures47

Acquisitions and Divestitures - Intangible Assets Acquired (Details) - Unidesk Corporation [Member] $ in Thousands	Jan. 03, 2017USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 39,470
Weighted average useful life	4 years
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 35,230
Weighted average useful life	4 years
Customer Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets acquired	$ 4,240
Weighted average useful life	4 years

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Investment [Line Items]
Average remaining maturities for short-term available for sale investments			6 months
Average remaining maturities for long-term available for sale investments			2 years
Proceeds from available-for-sale of investments	$ 104,100,000	$ 212,700,000	$ 562,100,000	$ 446,900,000
Gross unrealized losses on available-for-sale investments	3,200,000		3,200,000		$ 3,887,000
Gain on cost-method investments acquired by third parties	100,000		1,200,000
Other Assets [Member]
Investment [Line Items]
Cost method investments	18,500,000		18,500,000		$ 19,200,000
Other Income (Expense) [Member]
Investment [Line Items]
Realized gains on the sales of available-for-sale investments	200,000	300,000	700,000	500,000
Realized losses on the sales of available-for-sale investments	100,000	100,000	200,000	300,000
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Investment [Line Items]
Cost-method investments, aggregate carrying amount, evaluated for impairment during the period			2,600,000
Cost method investments, fair value after impairment			1,200,000
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Income (Expense) [Member]
Investment [Line Items]
Cost-method Investments, Other than Temporary Impairment	$ 0	$ 0	$ 1,400,000	$ 300,000

Investments (Schedule of Availa

Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Investment [Line Items]
Amortized Cost	$ 1,558,457	$ 1,709,922
Gross Unrealized Gains	1,219	1,030
Gross Unrealized Losses	(3,200)	(3,887)
Fair Value	1,556,476	1,707,065
Agency securities [Member]
Investment [Line Items]
Amortized Cost	479,435	411,963
Gross Unrealized Gains	625	699
Gross Unrealized Losses	(1,293)	(1,169)
Fair Value	478,767	411,493
Corporate securities [Member]
Investment [Line Items]
Amortized Cost	805,137	842,887
Gross Unrealized Gains	509	193
Gross Unrealized Losses	(1,164)	(2,114)
Fair Value	804,482	840,966
Municipal securities [Member]
Investment [Line Items]
Amortized Cost	3,965	9,989
Gross Unrealized Gains	12	3
Gross Unrealized Losses	0	(4)
Fair Value	3,977	9,988
Government securities [Member]
Investment [Line Items]
Amortized Cost	269,920	445,083
Gross Unrealized Gains	73	135
Gross Unrealized Losses	(743)	(600)
Fair Value	$ 269,250	$ 444,618

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	$ 843,245	$ 753,402
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	1,560,872	1,791,266
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	989	4,435
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	394	998
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Cash [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	753,839	528,637
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Cash [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Cash [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	89,406	224,765
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	1,526	82,693
Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	804,088	839,968
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	394	998
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	478,767	411,493
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Municipal securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Municipal securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	3,977	9,988
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Municipal securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Government securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Government securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	269,250	444,618
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Government 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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	3,264	2,506
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	989	4,435
Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	2,404,511	2,545,666
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	989	4,435
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Cash [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	753,839	528,637
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	89,406	224,765
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	1,526	82,693
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	804,482	840,966
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Agency Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	478,767	411,493
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Municipal securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	3,977	9,988
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	269,250	444,618
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	3,264	2,506
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	989	4,435
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	$ 2,791	$ 460

Fair Value Measurements (Asse51

Fair Value Measurements (Assets and Liabilities on a Nonrecurring Basis) (Details) - Nonrecurring [Member] - Level 3 [Member] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost-method investments, aggregate carrying amount, evaluated for impairment during the period			$ 2,600,000
Cost method investments, fair value after impairment			1,200,000
Other Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost-method Investments, Other than Temporary Impairment	$ 0	$ 0	$ 1,400,000	$ 300,000

Fair Value Measurements (Additi

Fair Value Measurements (Additional Information Regarding Fair Value Measurements) (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Senior Notes	$ 1,367,092,000	$ 0
Senior Notes Due 2019 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Senior Notes	1,400,000,000
Senior Notes Due 2019 [Member] | 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
Convertible Senior Notes	1,738,506,000
Senior Notes Due 2019 [Member] | Level 2 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Senior Notes	$ 1,367,092,000

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Mar. 31, 2017$ / sharesshares	Mar. 31, 2016$ / sharesshares	Jan. 31, 2016$ / sharesshares	Jun. 30, 2017USD ($)planshares	Jun. 30, 2016USD ($)shares	Jun. 30, 2017USD ($)planinstallmentshares	Jun. 30, 2016USD ($)
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 | $				$ 40,679	$ 38,367	$ 75,487	$ 74,428
Incremental share-based compensation expense to be recognized | $						$ 6,500
Market Performance and Service Condition Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)	275,148
Performance period for grants	3 years
Minimum return to shareholders as percentile of peer group to reach target share cap, minimum	80.00%
Total return to shareholders as percentile of peer group, minimum	41.00%
Total return to shareholders as percentile of peer group, maximum	80.00%
Performance share earned share cap based on maximum shareholder return (percent)	100.00%
Performance share earned share cap based on minimum shareholder return (percent)	200.00%
Performance share period to determine actual stock grant following end of interim measurement period	60 days
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)		234,816
Performance period for grants		3 years
Performance share maximum annualized shareholder return (percent)		10.00%
Performance share earned share cap based on maximum shareholder return (percent)		100.00%
Performance share minimum annualized shareholder return (percent)		5.00%
Performance share earned share cap based on minimum shareholder return (percent)		200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return, Percent, Maximum to attain 200%		30.00%
Performance share period to determine actual stock grant following end of interim measurement period		60 days
Performance share interim measurement period		18 months
Performance share earned share cap based on interim measurement period (percent)		33.00%
Period to determine actual stock grant following end of performance period		60 days
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	2 years 9 months	3 years	3 years
The estimated fair value of each award (in dollars per share) | $ / shares	$ 104.05	$ 66.18	$ 49.68
Share based awards granted and outstanding (shares)				5,152,745		5,152,745
Total unrecognized compensation cost related to stock-based compensation | $				$ 296,900		$ 296,900
Total unrecognized compensation cost recognition period						2 years 3 months 3 days
Minimum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility factor	27.00%	29.00%	29.00%
Maximum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility factor	32.00%	39.00%	37.00%
Superseded and Expired Stock Plans [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed						5 years
Superseded and Expired Stock Plans [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed						10 years
2014 Plan [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
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, payment period						6 months
Employee Stock Purchase Plan, maximum number of shares per period that employees can purchase						12,000
Employee Stock Purchase Plan, purchase price as a percentage of fair market value						85.00%
Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock						5.00%
Employee Stock Purchase Plan, total shares issued under plan (shares)				974,830		974,830
Expected life (in years)						6 months	6 months
Expected volatility factor						29.00%	41.00%
2015 ESPP Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay						1.00%
2015 ESPP Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay						10.00%
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $				$ 1,900	$ 2,100	$ 3,500	$ 4,400
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)				46,000,000		46,000,000
Shares reserved for issuance under the stock-based compensation plans (shares)				30,340,575		30,340,575
Shares available for grant under the 2014 Plan (shares)				25,119,327		25,119,327
Executive Officers [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $				$ 700		$ 1,300
Non-vested stock unit awards granted to senior level employees (shares)					118,588
Total unrecognized compensation cost | $				$ 4,000		$ 4,000
Executive Officers [Member] | Maximum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Chief Executive Officer [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)			220,235

Stock-Based Compensation (Assum

Stock-Based Compensation (Assumptions Used To Value Option Grants, Stock Awards and ESPP Shares(Details)	1 Months Ended			6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk free interest rate	1.48%	0.91%	1.10%
Expected dividend yield	0.00%	0.00%	0.00%
Expected life (in years)	2 years 9 months	3 years	3 years
Non-vested Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor	27.00%	29.00%	29.00%
Non-vested Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor	32.00%	39.00%	37.00%
2015 ESPP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor				29.00%	41.00%
Risk free interest rate				0.60%	0.35%
Expected dividend yield				0.00%	0.00%
Expected life (in years)				6 months	6 months

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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 40,679	$ 38,367	$ 75,487	$ 74,428
Cost of services and maintenance revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	815	542	1,407	1,036
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	11,660	9,689	21,326	17,444
Sales, marketing and services [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	14,728	12,560	26,325	23,504
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 13,476	$ 15,576	$ 26,429	$ 32,444

Goodwill And Other Intangible56

Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details)		3 Months Ended			6 Months Ended
		Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)reporting_unit	Dec. 31, 2016USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Statement [Line Items]
Impairment of goodwill and intangible assets		$ 0		$ 0
Number of reporting units | reporting_unit			2
Goodwill distributed to GetGo		1,617,105,000	$ 1,585,893,000	1,585,893,000	$ 1,585,893,000	$ 1,585,893,000
Goodwill [Roll Forward]
Balance at January 1, 2017			$ 1,585,893,000		1,585,893,000
Additions	[1]				31,212,000
Other					0
Balance at June 30, 2017		$ 1,617,105,000		$ 1,585,893,000	$ 1,617,105,000
GoTo Business Division [Member]
Statement [Line Items]
Goodwill attributable to the GoTo Business						$ 380,917,000
[1]	Amount relates to preliminary purchase price allocation of goodwill associated with the 2017 Business Combination. See Note 5 for more information regarding the Company's acquisitions.

Goodwill And Other Intangible57

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Statement [Line Items]
Amortization of product related intangible assets	$ 12,410	$ 14,390	$ 25,498	$ 28,447
Intangible Assets [Abstract]
Gross carrying amount	917,992		917,992		$ 871,286
Accumulated amortization	730,442		730,442		697,605
Intangible assets, fair value	187,550		187,550
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	690,060		690,060		647,594
Accumulated amortization	546,244		546,244		520,746
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	227,932		227,932		223,692
Accumulated amortization	184,198		$ 184,198		$ 176,859
Minimum [Member]
Statement [Line Items]
Intangible asset life			3 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	12,400	14,400	$ 25,500	28,400
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 3,700	$ 3,800	$ 7,300	$ 7,500

Goodwill And Other Intangible58

Goodwill And Other Intangible Assets (Schedule Of Estimated Future Amortization Expense) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2017 (remaining six months)	$ 31,886
2,018	59,636
2,019	39,010
2,020	24,851
2,021	8,890
Thereafter	23,277
Total	$ 187,550

Segment Information (Additional

Segment Information (Additional Information) (Details)	6 Months Ended
	Jun. 30, 2017segment
Segment Reporting [Abstract]
Number of reportable segments	1

Segment Information (Revenues B

Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net revenues		$ 693,227	$ 673,987	$ 1,355,904	$ 1,332,760
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net revenues		693,227	673,987	1,355,904	1,332,760
Operating Segments [Member] | Workspace Services revenues [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	420,908	410,426	820,412	809,940
Operating Segments [Member] | Networking revenues [Member]
Segment Reporting Information [Line Items]
Net revenues	[2]	196,876	194,898	390,296	390,368
Operating Segments [Member] | Data revenues [Member]
Segment Reporting Information [Line Items]
Net revenues	[3]	43,614	33,748	83,649	64,882
Operating Segments [Member] | Professional Services [Member]
Segment Reporting Information [Line Items]
Net revenues	[4]	$ 31,829	$ 34,915	$ 61,547	$ 67,570
[1]	Workspace Services revenues are primarily comprised of sales from the Company’s application virtualization products, which include XenDesktop and XenApp, and the Company's enterprise mobility management products, which include XenMobile and related license updates and maintenance and support.
[2]	Networking revenues primarily include NetScaler ADC and NetScaler SD-WAN, and related license updates and maintenance and support.
[3]	Data revenues primarily include ShareFile, Podio and Citrix Cloud.
[4]	Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.

Segment Information (Revenues61

Segment Information (Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 693,227	$ 673,987	$ 1,355,904	$ 1,332,760
Operating Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	693,227	673,987	1,355,904	1,332,760
Operating Segments [Member] | Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	403,072	402,684	794,418	791,370
Operating Segments [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	217,313	205,064	419,165	411,995
Operating Segments [Member] | Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 72,842	$ 66,239	$ 142,321	$ 129,395

Convertible Senior Notes (Narra

Convertible Senior Notes (Narrative) (Details)	Feb. 01, 2017$ / shares	Apr. 30, 2014$ / sharesshares	Jan. 31, 2017$ / shares	Jun. 30, 2017USD ($)shares	Jun. 30, 2014USD ($)	Jun. 30, 2017USD ($)shares	Jun. 30, 2016USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Amount used to repurchase stock						$ 500,000,000	$ 28,689,000
Convertible notes, long-term				$ 1,367,092,000		1,367,092,000			$ 0
Convertible notes				0		0			1,348,156,000
Temporary equity				0		0			79,495,000
Purchase From Accelerated Share Repurchase [Member]
Debt Instrument [Line Items]
Stock repurchased during period, value					$ 1,400,000,000
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Convertible debt				1,367,092,000		1,367,092,000		$ 1,440,000,000	1,348,156,000
Stated interest rate percentage								0.50%
Proceeds from convertible debt								$ 1,420,000,000
Payments for (proceeds from) hedge, investing activities								$ 82,600,000
Stock repurchased during period, value					1,500,000,000
Convertible debt, conversion ratio	0.0139061		0.011111
Debt instrument, face amount				1,000		$ 1,000
Convertible debt, conversion price (in dollars per share) | $ / shares	$ 71.91		$ 90
Repurchase price as a percent of principal amount						100.00%
Amortization of debt discount, effective interest method, percent						3.00%
Convertible notes, long-term				1,400,000,000		$ 1,400,000,000
Convertible notes									1,300,000,000
Deferred tax liability, equity component				8,200,000		8,200,000
Temporary equity				$ 0		$ 0			$ 79,495,000
Shares of common stock covered by note hedges (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
Strike price of warrants (in dollars per share) | $ / shares	$ 95.25	$ 120
Warrants exercised (shares) | shares						0
Privately Negotiated Transaction [Member]
Debt Instrument [Line Items]
Amount used to repurchase stock					$ 101,000,000

Convertible Senior Notes (Detai

Convertible Senior Notes (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2014
Debt Instrument [Line Items]
Temporary equity	$ 0	$ 79,495
Additional paid-in capital	4,922,187	4,761,588
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Principal	1,437,483	1,437,500
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	70,391	89,344
Net carrying amount	1,367,092	1,348,156	$ 1,440,000
Temporary equity	0	79,495
Additional paid-in capital	162,869	83,374
Total equity (including temporary equity)	$ 162,869	$ 162,869

Convertible Notes - Schedule of

Convertible Notes - Schedule of Interest Expense (Details) - Senior Notes Due 2019 [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Contractual interest expense	$ 1,797	$ 1,797	$ 3,594	$ 3,594
Amortization of debt issuance costs	1,039	1,015	2,071	2,024
Amortization of debt discount	8,472	8,222	16,882	16,383
Debt Instrument, Interest Expense, Total	$ 11,308	$ 11,034	$ 22,547	$ 22,001

Credit Facility (Details)

Credit Facility (Details) - Line of Credit [Member]	Jan. 07, 2015USD ($)	Jun. 30, 2017USD ($)
Line of Credit Facility [Line Items]
Term of credit facility	5 years
Aggregate amount	$ 250,000,000
Additional borrowing capacity	$ 250,000,000
Weighted average interest rate on amounts outstanding (percent)		1.96%
Amount outstanding		$ 30,000,000
Consolidated leverage ratio	3.5
Consolidated interest coverage ratio	3
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Aggregate amount	$ 25,000,000
Swing Line Loans [Member]
Line of Credit Facility [Line Items]
Aggregate amount	$ 10,000,000
LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on LIBOR (percent)		1.10%
Minimum [Member]
Line of Credit Facility [Line Items]
Quarterly facility fee (percent)		0.125%
Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on LIBOR (percent)		1.00%
Maximum [Member]
Line of Credit Facility [Line Items]
Quarterly facility fee (percent)		0.20%
Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on LIBOR (percent)		1.30%

Derivative Financial Instrume66

Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Cash flow hedge instrument term, maximum	12 months
Cumulative unrealized gain (loss) on cash flow derivative instruments in accumulated other comprehensive loss	$ 2.4	$ (3.1)

Derivative Financial Instrume67

Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Instruments) (Details) - Cash Flow Hedging [Member] - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives
Asset derivatives	$ 2,791	$ 460
Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liability Derivatives
Liability derivatives	209	3,816
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives
Asset derivatives	473	2,046
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liability Derivatives
Liability derivatives	$ 780	$ 619

Derivative Financial Instrume68

Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Not Designated as Hedging Instrument [Member] | Other (Expense) Income, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in Income on Derivative	$ (2,064)	$ (1,992)	$ (5,150)	$ (3,965)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Effective Portion)	1,890	(2,360)	5,554	1,027
Cash Flow Hedging [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 (Effective Portion)	$ (6)	$ 142	$ (1,678)	$ (1,023)

Derivative Financial Instrume69

Derivative Financial Instruments (Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding) (Details) - Jun. 30, 2017 € in Thousands, ₨ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, SGD in Thousands, SFr in Thousands, HKD in Thousands, DKK in Thousands, CAD in Thousands, BRL in Thousands, AUD in Thousands

SGD

DKK

GBP (£)

JPY (¥)

CHF (SFr)

AUD

HKD

BRL

EUR (€)

INR (₨)

CAD

CNY (¥)

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional foreign currency forward contracts outstanding

SGD 10,400

DKK 8,264

£ 7,400

¥ 1,587,000

SFr 16,550

AUD 5,600

HKD 26,000

BRL 11,200

€ 4,678

₨ 205,765

CAD 2,350

¥ 60,687

Comprehensive Income (Changes i

Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			$ (28,704)
Other comprehensive income before reclassifications			5,316
Amounts reclassified from accumulated other comprehensive loss			1,209
Other comprehensive income (loss)	$ 2,155	$ (837)	6,525	$ 6,627
Distribution of the GoTo Business			13,400
Balance at June 30, 2017	(8,779)		(8,779)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(16,346)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive income (loss)			0
Distribution of the GoTo Business			13,400
Balance at June 30, 2017	(2,946)		(2,946)
Unrealized (Loss) Gain on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(3,108)
Other comprehensive income before reclassifications			1,440
Amounts reclassified from accumulated other comprehensive loss			(460)
Other comprehensive income (loss)			980
Distribution of the GoTo Business			0
Balance at June 30, 2017	(2,128)		(2,128)
Unrealized (Loss) Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(3,130)
Other comprehensive income before reclassifications			3,876
Amounts reclassified from accumulated other comprehensive loss			1,678
Other comprehensive income (loss)			5,554
Distribution of the GoTo Business			0
Balance at June 30, 2017	2,424		2,424
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2016			(6,120)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			(9)
Other comprehensive income (loss)			(9)
Distribution of the GoTo Business			0
Balance at June 30, 2017	$ (6,129)		$ (6,129)

Comprehensive Income (Reclassif

Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net gains on available-for-sale securities		$ 1,141	$ 272	$ (2,185)	$ 1,275
Unrealized net losses on cash flow hedges		461,974	432,857	899,549	896,567
Net income		(108,829)	$ (120,898)	(136,450)	$ (204,361)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income		(79)		1,218
Unrealized Gain on Available-for-sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net gains on available-for-sale securities		(85)		(460)
Unrealized Gain on Derivative Instruments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net losses on cash flow hedges	[1]	$ 6		$ 1,678
[1]	Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective tax rate	4.80%	16.10%	23.60%	15.90%
Tax benefit for international statutory tax transaction	$ 9.8		$ 9.8
Income tax charge due to change in expectation of realizibility of R&D credits			46.1
Income tax benefit for first quarter results of share-based payments to employees				$ 18.5
Net unrecognized tax benefit	76.1		76.1		$ 69.8
Income tax interest and penalties accrued	3.4		3.4
Deferred tax assets	$ 176.5		$ 176.5
U.S. federal statutory rate			35.00%

Treasury Stock (Details)

Treasury Stock (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 6,800,000,000		$ 6,800,000,000
Available to repurchase common stock	404,000,000		404,000,000
Amount expended on share repurchases in open market transactions	$ 0	$ 0	$ 500,000,000	$ 28,700,000
Number of shares repurchased			6,399,499	426,300
Average per share price on share repurchases in open market transactions (in dollars per share)			$ 78.13	$ 67.30
Number of shares withheld to satisfy minimum tax withholding obligations	43,446	134,771	734,600	563,609
Payment for tax withholding related to vested stock units	$ 3,600,000	$ 11,000,000	$ 60,500,000	$ 43,900,000
Amount Authorized in January 2017 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 500,000,000		$ 500,000,000

Restructuring Restructuring (De

Restructuring Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring and Related Activities [Abstract]
Employee severance and related costs	$ 2,107	$ 2,541	$ 8,553	$ 38,409
Consolidation of leased facilities	211	1,216	1,751	10,904
Reversal of previous charges	(178)	(177)	(178)	(177)
Total Restructuring charges	$ 2,140	$ 3,580	$ 10,126	$ 49,136

Restructuring (Narrative) (Deta

Restructuring (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 2,140	$ 3,580	$ 10,126	$ 49,136
Operational Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1,800		7,500
Total expected cost	16,000		16,000
Restructuring costs incurred since inception	$ 7,500		$ 7,500

Restructuring (Activity in Rest

Restructuring (Activity in Restructuring Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Balance at January 1, 2017			$ 38,059
Restructuring charges	$ 2,140	$ 3,580	10,126	$ 49,136
Payments			(9,373)
Balance at June 30, 2017	$ 38,812		$ 38,812

Recent Accounting Pronounceme77

Recent Accounting Pronouncements (Details) $ in Millions	Dec. 31, 2016USD ($)
Accounting Standards Update 2016-09 [Member]
Debt Instrument [Line Items]
Adjustment to deferred tax assets	$ 0.4
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
Debt Instrument [Line Items]
Cumulative-effect adjustment from adoption of accounting standard on stock-based compensation	0.4
Retained Earnings [Member] | Accounting Standards Update 2016-09, Forfeiture Rate Component [Member]
Debt Instrument [Line Items]
Cumulative-effect adjustment from adoption of accounting standard on stock-based compensation	(5.7)
Additional Paid-in Capital [Member] | Accounting Standards Update 2016-09, Forfeiture Rate Component [Member]
Debt Instrument [Line Items]
Cumulative-effect adjustment from adoption of accounting standard on stock-based compensation	$ 5.7