Citrix Systems (CTXS) 10-Q 4 Nov 16 2016 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 28, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
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		155,966,012

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,308,683	$ 368,518
Short-term investments, available-for-sale	354,328	502,852
Accounts receivable, net of allowances of $5,561 and $7,719 at September 30, 2016 and December 31, 2015, respectively	475,085	669,276
Inventories, net	14,809	10,521
Prepaid expenses and other current assets	119,482	132,784
Total current assets	2,272,387	1,683,951
Long-term investments, available-for-sale	789,038	891,964
Property and equipment, net	352,521	373,817
Goodwill	1,965,024	1,962,722
Other intangible assets, net	247,392	283,418
Deferred tax assets, net	231,681	215,196
Other assets	64,460	56,449
Total assets	5,922,503	5,467,517
Current liabilities:
Accounts payable	85,655	95,396
Accrued expenses and other current liabilities	279,947	317,468
Income taxes payable	51,341	18,351
Current portion of deferred revenues	1,194,101	1,249,754
Convertible notes, short-term	1,338,782	0
Total current liabilities	2,949,826	1,680,969
Long-term portion of deferred revenues	418,169	414,314
Convertible notes, long-term	0	1,311,071
Other liabilities	114,931	87,717
Commitments and contingencies
Temporary equity from Convertible notes	87,841	0
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; 302,107 and 299,113 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	302	299
Additional paid-in capital	4,687,343	4,566,919
Retained earnings	3,810,887	3,474,625
Accumulated other comprehensive loss	(22,835)	(28,527)
Stockholders' equity before treasury stock	8,475,697	8,013,316
Less - common stock in treasury, at cost (146,420 and 145,296 shares at September 30, 2016 and December 31, 2015, respectively)	(6,123,961)	(6,039,870)
Total stockholders' equity	2,351,736	1,973,446
Total liabilities, temporary equity and stockholders' equity	$ 5,922,503	$ 5,467,517

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 5,561	$ 7,719
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Preferred stock, 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	302,107,000	299,113,000
Common stock, shares outstanding	302,107,000	299,113,000
Common stock in treasury, shares	146,420,000	145,296,000

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Product and licenses	$ 206,179	$ 206,252	$ 628,002	$ 594,507
Software as a service	207,050	190,757	606,544	537,705
License updates and maintenance	398,171	379,585	1,178,053	1,128,043
Professional services	29,851	36,676	97,310	110,576
Total net revenues	841,251	813,270	2,509,909	2,370,831
Cost of net revenues:
Cost of product and license revenues	28,059	34,859	93,077	83,833
Cost of services and maintenance revenues	93,829	91,295	281,440	270,218
Amortization of product related intangible assets	14,959	19,140	45,744	56,225
Impairment of product related intangible assets	1,128	960	1,128	1,335
Total cost of net revenues	137,975	146,254	421,389	411,611
Gross margin	703,276	667,016	2,088,520	1,959,220
Operating expenses:
Research and development	126,887	139,128	375,607	423,972
Sales, marketing and services	291,848	293,587	883,045	896,250
General and administrative	93,686	79,799	281,601	241,697
Amortization of other intangible assets	7,387	12,534	22,067	32,967
Impairment of other intangible assets	0	64,404	0	64,404
Restructuring	12,061	13,766	62,142	62,251
Separation	17,580	0	46,190	0
Total operating expenses	549,449	603,218	1,670,652	1,721,541
Income from operations	153,827	63,798	417,868	237,679
Interest income	4,193	3,004	12,108	8,679
Interest expense	11,254	11,075	33,605	33,196
Other income (expense), net	494	(2,369)	(781)	(13,480)
Income before income taxes	147,260	53,358	395,590	199,682
Income tax expense (benefit)	15,359	(2,567)	59,328	11,595
Net income	$ 131,901	$ 55,925	$ 336,262	$ 188,087
Earnings per share:
Basic (in dollars per share)	$ 0.85	$ 0.35	$ 2.17	$ 1.17
Diluted (in dollars per share)	$ 0.84	$ 0.35	$ 2.15	$ 1.16
Weighted average shares outstanding:
Basic (in shares)	155,525	160,359	154,847	160,359
Diluted (in shares)	157,532	161,777	156,697	161,716

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unuaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 131,901	$ 55,925	$ 336,262	$ 188,087
Available for sale securities:
Change in net unrealized (losses) gains	(1,029)	94	4,863	1,392
Less: reclassification adjustment for net (gains) losses included in net income	(928)	232	(1,220)	164
Net change (net of tax effect)	(1,957)	326	3,643	1,556
Cash flow hedges:
Change in unrealized gains (losses)	382	(2,348)	386	(5,692)
Less: reclassification adjustment for net losses included in net income	641	1,794	1,663	11,462
Net change (net of tax effect)	1,023	(554)	2,049	5,770
Other comprehensive (loss) income	(934)	(228)	5,692	7,326
Comprehensive income	$ 130,967	$ 55,697	$ 341,954	$ 195,413

Condensed Consolidated Stateme6

Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net income	$ 336,262	$ 188,087
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	219,155	295,810
Stock-based compensation expense	136,202	103,674
Excess tax benefit from stock-based compensation	(12,374)	(2,236)
Deferred income tax benefit	(23,912)	(31,873)
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	(3,489)	13,382
Other non-cash items	9,247	11,155
Total adjustments to reconcile net income to net cash provided by operating activities	324,829	389,912
Changes in operating assets and liabilities, net of the effects of acquisitions:
Accounts receivable	193,023	198,075
Inventories	(5,354)	1,084
Prepaid expenses and other current assets	14,306	(7,375)
Other assets	(8,341)	(1,460)
Income taxes, net	51,967	21,088
Accounts payable	(17,778)	6,658
Accrued expenses and other current liabilities	484	(674)
Deferred revenues	(47,128)	(47,982)
Other liabilities	14,513	5,400
Total changes in operating assets and liabilities, net of the effects of acquisitions	195,692	174,814
Net cash provided by operating activities	856,783	752,813
Investing Activities
Purchases of available-for-sale investments	(1,411,077)	(1,806,781)
Proceeds from sales of available-for-sale investments	1,156,168	1,552,983
Proceeds from maturities of available-for-sale investments	511,023	518,755
Purchases of property and equipment	(105,339)	(119,591)
Cash paid for acquisitions, net of cash acquired	(11,455)	(250,986)
Cash paid for licensing agreements and technology	(26,079)	(10,666)
Other	464	(3,400)
Net cash provided by (used in) investing activities	113,705	(119,686)
Financing Activities
Proceeds from issuance of common stock under stock-based compensation plans	39,438	79,338
Proceeds from credit facility	0	95,000
Repayment of credit facility	0	(95,000)
Repayment of acquired debt	0	(7,569)
Excess tax benefit from stock-based compensation	12,374	2,236
Stock repurchases, net	(28,689)	(398,070)
Cash paid for tax withholding on vested stock awards	(55,402)	(32,351)
Net cash used in financing activities	(32,279)	(356,416)
Effect of exchange rate changes on cash and cash equivalents	1,956	(9,266)
Change in cash and cash equivalents	940,165	267,445
Cash and cash equivalents at beginning of period	368,518	260,149
Cash and cash equivalents at end of period	$ 1,308,683	$ 527,594

Basis Of Presentation

Basis Of Presentation	9 Months Ended
	Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The accompanying unaudited condensed consolidated financial statements of Citrix Systems, Inc. (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by accounting principles generally accepted in the United States for complete financial statements. All adjustments, which, in the opinion of management, are considered necessary for a fair presentation of the results of operations for the periods shown, are of a normal recurring nature and have been reflected in the condensed consolidated financial statements and accompanying notes. The results of operations for the periods presented are not necessarily indicative of the results expected for the full year or for any future period partially because of the seasonality of the Company’s business. Historically, the Company’s revenue for the fourth quarter of any year is typically higher than the revenue for the first quarter of the subsequent year. 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, 2015 . 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. As part of its continued transformation, effective January 1, 2016, the Company reorganized a part of its business by creating a new Cloud Services business unit that primarily includes the ShareFile product line. Prior to 2016, the ShareFile product line was included within the Company's Workflow Cloud products under the GoTo Business segment (formerly Mobility Apps). The Company's management has changed how it views the business primarily due to operational initiatives announced in 2015, which include increased emphasis and investments in core enterprise products for secure and reliable application and data delivery. As a result, the Company realigned its Cloud Services products and services to be included in the Enterprise and Service Provider segment effective January 1, 2016 in contemplation of the strategic shift and the proposed separation of the GoTo Business. See Note 18 more information on the Company's proposed separation of its GoTo Business. The Company's revenues are derived from sales of Enterprise and Service Provider products which include Workspace Services products, Delivery Networking products, Cloud Services products and related License updates and maintenance and Professional services and sales of the GoTo Business, which are delivered as cloud-based SaaS, and include Communications Cloud and Workflow Cloud service offerings. The Enterprise and Service Provider and the GoTo business units constitute the Company's two reportable segments. See Note 9 for more information on the Company's segments.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015 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 5 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, which is typically 12 months. In addition, SaaS revenues may also include set-up fees, which are 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 is a renewable program that provides subscribers with immediate access to software upgrades, enhancements and maintenance releases when and if they become available during the term of the contract. 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 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 during the term of the contract. 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: persuasive evidence of the arrangement exists; delivery has occurred or the service has been provided and the Company has no remaining obligations; the fee is fixed or determinable; and 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 Company’s GoTo Business products and a majority of Cloud Services are considered hosted service arrangements per the authoritative guidance, or SaaS. Generally, the Company’s GoTo Business products are sold separately and not bundled with the Enterprise and Service Provider business unit’s products and services. In the normal course of business, the Company is not obligated to accept product returns from its distributors 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 approximately $1.2 million and $1.4 million at September 30, 2016 and December 31, 2015 , 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. Effective January 1, 2015, the functional currency of the Company’s wholly-owned foreign subsidiaries of its GoTo Business segment became the U.S. dollar as a result of a reorganization in the foreign subsidiaries' operations. Prior to January 1, 2015, the functional currency of the Company’s wholly-owned foreign subsidiaries of its GoTo Business segment 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. The change in functional currency is applied on a prospective basis, therefore a ny gains and losses that were previously recorded in Accumulated other comprehensive loss remain unchanged from January 1, 2015. 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. See Note 9 for information on the Company's Enterprise and Service Provider and GoTo Business segments. 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 7 for further information regarding the Company’s stock-based compensation plans.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2016
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 Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Numerator: Net income $ 131,901 $ 55,925 $ 336,262 $ 188,087 Denominator: Denominator for basic earnings per share - weighted-average shares outstanding 155,525 160,359 154,847 160,359 Effect of dilutive employee stock awards 2,007 1,418 1,850 1,357 Denominator for diluted earnings per share - weighted-average shares outstanding 157,532 161,777 156,697 161,716 Basic earnings per share $ 0.85 $ 0.35 $ 2.17 $ 1.17 Diluted earnings per share $ 0.84 $ 0.35 $ 2.15 $ 1.16 Anti-dilutive weighted-average shares from stock awards 60 1,572 460 2,416 The weighted-average number of shares outstanding used in the computation of basic and diluted earnings per share does not include the effect of the potential outstanding common stock from the Company's Convertible Senior Notes (the "Convertible Notes") and warrants. The effects of these potentially outstanding 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, as 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 shares for a given period exceeds the conversion price of $90.00 per share. For the three and nine months ended September 30, 2016 and 2015 , the Convertible Notes have been excluded from the computation of diluted earnings per share as the effect would be anti-dilutive since the 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 10 to the Company's condensed consolidated financial statements for detailed information on the Convertible Notes offering.

Acquisitions and Divestitures

Acquisitions and Divestitures	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
ACQUISITIONS AND DIVESTITURES	ACQUISITIONS AND DIVESTITURES 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 acquired company became part of the Company’s Enterprise and Service Provider segment. The total cash consideration for this transaction was approximately $11.5 million , net of $0.8 million cash acquired. Transaction costs were $0.4 million , of which $0.3 million were recorded during the three months ended September 30, 2016 and $0.4 million during the nine months ended September 30, 2016 . All transaction costs are presented within General and administrative expense in the accompanying condensed consolidated statements of income. 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 $2.9 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 nine months ended September 30, 2016 , therefore no income was recognized during the nine months ended September 30, 2016 . 2015 Acquisitions Sanbolic On January 8, 2015, the Company acquired all of the issued and outstanding securities of Sanbolic, Inc. (“Sanbolic”). The Company expected the Sanbolic technology would reduce the complexity of Microsoft Windows application delivery and desktop virtualization deployments. Sanbolic became part of the Company's Enterprise and Service Provider segment. The total cash consideration for this transaction was approximately $89.4 million , net of $0.2 million cash acquired. Transaction costs associated with the acquisition were $0.5 million . No transaction costs were recorded during the three months ended September 30, 2015 and the Company expensed $0.2 million during the nine months ended September 30, 2015 , and are included in General and administrative expense in the accompanying condensed consolidated statements of income. In addition, in connection with the acquisition, the Company assumed non-vested stock units which were converted into the right to receive, in the aggregate, up to 37,057 shares of the Company's common stock, for which the vesting period began on the closing of the transaction. During the fourth quarter of 2015, management performed a comprehensive operational review which included an evaluation of all of the Company's products. In connection with this review, management determined that the Sanbolic technology was a non-core solution and that the related product offerings will no longer be developed. As a result, the Company impaired the remaining carrying value of the intangible assets related to this acquisition in the fourth quarter of 2015. Grasshopper On May 18, 2015, the Company acquired all of the membership interests of Grasshopper Group, LLC (“Grasshopper”), a leading provider of cloud-based phone solutions for small businesses. With the acquisition, the Company will expand its breadth of communication and collaboration solutions for small businesses, including GoToMeeting, GoToTraining, GoToWebinar and OpenVoice. Grasshopper became part of the GoTo Business segment. Total cash consideration for this transaction was approximately $161.5 million , net of $3.6 million cash acquired. No transaction costs were recorded during the three months ended September 30, 2015 and the Company expensed $0.3 million during the nine months ended September 30, 2015 , and are included in General and administrative expense in the accompanying condensed consolidated statements of income. In addition, in connection with the acquisition, the Company assumed non-vested stock units which were converted into the right to receive, in the aggregate, up to 105,765 shares of the Company's common stock, for which the vesting period commenced on the closing of the transaction.

Investments

Investments	9 Months Ended
	Sep. 30, 2016
Investments [Abstract]
INVESTMENTS	INVESTMENTS Available-for-sale Investments Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands): September 30, 2016 December 31, 2015 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 $ 376,248 $ 727 $ (206 ) $ 376,769 $ 530,981 $ 757 $ (1,216 ) $ 530,522 Corporate securities 606,851 855 (357 ) 607,349 699,210 90 (1,929 ) 697,371 Municipal securities 9,990 15 — 10,005 14,872 14 (8 ) 14,878 Government securities 149,252 89 (98 ) 149,243 152,376 9 (340 ) 152,045 Total $ 1,142,341 $ 1,686 $ (661 ) $ 1,143,366 $ 1,397,439 $ 870 $ (3,493 ) $ 1,394,816 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 13 for more information related to comprehensive income. The average remaining maturities of the Company’s short-term and long-term available-for-sale investments at September 30, 2016 were approximately eight months and three years, respectively. Realized Gains and Losses on Available-for-sale Investments For the three and nine months ended September 30, 2016 , the Company received proceeds from the sales of available-for-sale investments of $709.2 million and $1.16 billion , respectively, and for the three and nine months ended September 30, 2015 , it received proceeds from the sales of available-for-sale investments of $718.4 million and $1.55 billion , respectively. The Company had realized gains on the sales of available-for-sale investments during the three and nine months ended September 30, 2016 of $1.0 million and $1.6 million , respectively, and for the three and nine months ended September 30, 2015 , it had realized gains on the sales of available-for-sale investments of $0.3 million and $0.7 million , respectively. For the three and nine months ended September 30, 2016 , the Company had realized losses on available-for-sale investments of $0.1 million and $0.3 million , respectively, and for the three and nine months ended September 30, 2015 , it had realized losses of $0.6 million and $0.9 million , respectively, primarily related to sales of these investments during the period. All realized gains and losses related to the sales of available-for-sale investments are included in Other income (expense), 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 September 30, 2016 and December 31, 2015 were $0.7 million and $3.5 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 approximately $19.7 million and $19.9 million as of September 30, 2016 and December 31, 2015 , 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 September 30, 2016 , certain cost method investments with a combined carrying value of $1.0 million were determined to be impaired and written down to their estimated fair values of $0.1 million . For the nine months ended September 30, 2016 , certain cost method investments with a combined carrying value of $1.2 million were determined to be impaired and written down to their estimated fair values $0.1 million . Accordingly, the Company recorded $0.9 million and $1.1 million impairment charges during the three and nine months ended September 30, 2016 respectively, which are included in Other income (expense), net in the accompanying condensed consolidated financial statements. For the three months ended September 30, 2015 , no cost method investments were determined to be impaired. For the nine months ended September 30, 2015 , the Company determined that certain cost method investments were impaired and recorded a charge of $3.0 million , which was included in Other income (expense), net in the accompanying condensed consolidated statements of income.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The authoritative guidance defines fair value as an exit price, representing the amount that would either be received to sell an asset or be paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: • Level 1. Observable inputs such as quoted prices in active markets for identical assets or liabilities; • Level 2 . Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 . Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. Available-for-sale securities included in Level 2 are valued utilizing inputs obtained from an independent pricing service (the “Service”) which uses quoted market prices for identical or comparable instruments rather than direct observations of quoted prices in active markets. The Service applies a four level hierarchical pricing methodology to all of the Company’s fixed income securities based on the circumstances. The hierarchy starts with the highest priority pricing source, then subsequently uses inputs obtained from other third-party sources and large custodial institutions. The Service’s providers utilize a variety of inputs to determine their quoted prices. These inputs may include interest rates, known historical trades, yield curve information, benchmark data, prepayment speeds, credit quality and broker/dealer quotes. Substantially all of the Company’s available-for-sale investments are valued utilizing inputs obtained from the Service and accordingly are categorized as Level 2 in the table below. The Company periodically independently assesses the pricing obtained from the Service and historically has not adjusted the Service's pricing as a result of this assessment. Available-for-sale securities are included in Level 3 when relevant observable inputs for a security are not available. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy. In certain instances, the inputs used to measure fair value may meet the definition of more than one level of the fair value hierarchy. The input with the lowest level priority is used to determine the applicable level in the fair value hierarchy. Assets and Liabilities Measured at Fair Value on a Recurring Basis As of September 30, 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 $ 498,627 $ 498,627 $ — $ — Money market funds 797,035 797,035 — — Corporate securities 13,021 — 13,021 — Available-for-sale securities: Agency securities 376,769 — 376,769 — Corporate securities 607,349 — 606,201 1,148 Municipal securities 10,005 — 10,005 — Government securities 149,243 — 149,243 — Prepaid expenses and other current assets: Foreign currency derivatives 1,902 — 1,902 — Total assets $ 2,453,951 $ 1,295,662 $ 1,157,141 $ 1,148 Accrued expenses and other current liabilities: Foreign currency derivatives 2,364 — 2,364 — Total liabilities $ 2,364 $ — $ 2,364 $ — As of December 31, 2015 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 $ 261,962 $ 261,962 $ — $ — Money market funds 102,968 102,968 — — Corporate securities 3,588 — 3,588 — Available-for-sale securities: Agency securities 530,522 — 530,522 — Corporate securities 697,371 — 695,809 1,562 Municipal securities 14,878 — 14,878 — Government securities 152,045 — 152,045 — Prepaid expenses and other current assets: Foreign currency derivatives 1,063 — 1,063 — Total assets $ 1,764,397 $ 364,930 $ 1,397,905 $ 1,562 Accrued expenses and other current liabilities: Foreign currency derivatives 3,678 — 3,678 — Total liabilities $ 3,678 $ — $ 3,678 $ — 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) During the three months ended September 30, 2016 , certain cost method investments with a combined carrying value of $1.0 million were determined to be impaired and written down to their estimated fair values of $0.1 million . During the nine months ended September 30, 2016 , certain cost method investments with a combined carrying value of $1.2 million were determined to be impaired and written down to their estimated fair values $0.1 million . Accordingly, the Company recorded $0.9 million and $1.1 million impairment charges during the three and nine months ended September 30, 2016 respectively, which are included in Other income (expense), net in the accompanying condensed consolidated financial statements. For the three months ended September 30, 2015 , no cost method investments were determined to be impaired. For the nine months ended September 30, 2015 , the Company determined that certain cost method investments were impaired and recorded a charge of $3.0 million , which was included in Other income (expense), 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 8 to the Company's condensed consolidated financial statements for detailed information related to Goodwill and Other Intangible Assets. In connection with the change in segment composition, during the first quarter of 2016, the Company performed an assessment of its goodwill reporting units and determined that the recent Cloud Services reorganization resulted in the identification of three goodwill reporting units. The identification of these reporting units triggered a reallocation of goodwill as of January 1, 2016 based on the relative fair value approach. The fair value of each reporting unit was determined using a combination of the market approach and the income approach. Under the market approach, fair value is based on revenue and earnings multiples for guideline public companies and guideline transactions in the reporting unit's peer group. Specific to the income approach, key assumptions used include forecasts of revenue and expenses over an extended period of time, tax rates, long term growth rates and estimated costs of debt and equity capital to discount the projected cash flows. This non-recurring fair value measurement was categorized as Level 3, as significant unobservable inputs were used in the valuation analysis. Certain of these assumptions involve significant judgment, are based on management’s estimate of current and forecasted market conditions and are sensitive and susceptible to change. For Level 3 measurements, significant increases or decreases in long-term growth rates or discount rates in isolation or in combination could result in a significantly lower or higher fair value measurement. See Note 8 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 September 30, 2016 , 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 September 30, 2016 , 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 $ 1,583,550 $ 1,338,782

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 , 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 2014 Equity Incentive Plan (the "2014 Plan"). In December 2014, the Company's Board of Directors approved the 2015 Employee Stock Purchase Plan (the “2015 ESPP”), which was approved by stockholders at the Company's Annual Meeting of Stockholders held on May 28, 2015. The 2015 ESPP has replaced the Company's Amended and Restated 2005 Employee Stock Purchase Plan (as amended, the "2005 ESPP"). 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 and expired 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 and expired stock plans include the Amended and Restated 2005 Equity Incentive Plan and the 2005 ESPP. 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 29,000,000 shares of common stock. In addition, shares of common stock underlying any awards granted under the Company’s Amended and Restated 2005 Equity Incentive Plan, as amended, that are forfeited, canceled or otherwise terminated (other than by exercise) are added to its 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 September 30, 2016 , there were 21,286,552 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 16,230,548 shares of common stock. 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 September 30, 2016 , 3,872,661 shares had been issued under the 2005 ESPP. As of September 30, 2016 , 825,513 shares have been issued under the 2015 ESPP. The Company recorded stock-based compensation costs related to its employee stock purchase plans of $2.6 million and $7.8 million for the three and nine months ended September 30, 2016 , respectively, and the Company recorded stock-based compensation costs of $2.3 million and $5.2 million for the three and nine months ended September 30, 2015 , 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: Three Months Ended Nine Months Ended September 30, 2016 September 30, 2015 September 30, 2016 September 30, 2015 Expected volatility factor 0.27 - 0.41 0.35 0.27 - 0.41 0.35 Risk free interest rate 0.35% - 0.42% 0.25 % 0.25% - 0.42% 0.25 % Expected dividend yield 0 % 0 % 0 % 0 % Expected life (in years) 0.5 0.5 0.5 0.5 The Company determined the expected volatility factor by considering the implied volatility in six-month market-traded options of the Company's common stock based on third party volatility quotes. The Company's decision to use implied volatility was based upon the availability of actively traded options on the Company's common stock and its assessment that implied volatility is more representative of future stock price trends than historical volatility. The risk-free interest rate was based on a U.S. Treasury instrument whose term is consistent with the expected term of the stock options. The 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. Stock-Based Compensation The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands): Three Months Ended Nine Months Ended Income Statement Classifications September 30, 2016 September 30, 2015 September 30, 2016 September 30, 2015 Cost of services and maintenance revenues $ 911 $ 803 $ 2,561 $ 2,095 Research and development 13,256 9,118 35,878 31,454 Sales, marketing and services 14,848 16,922 41,442 38,083 General and administrative 19,267 11,828 56,321 32,042 Total $ 48,282 $ 38,671 $ 136,202 $ 103,674 Non-vested Stock Units Performance, Market Performance and Service Condition Stock Units In January 2016, the Company granted its 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. 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. In March 2015, the Company granted senior level employees non-vested stock unit awards representing, in the aggregate, 393,464 non-vested stock units that vest based on certain target market performance and service conditions. The number of non-vested stock units underlying the award will be determined within sixty days of the calendar year following the end of a three -year performance period ending December 31, 2017. The attainment level under the award will be based on the Company's total return to stockholders over the performance period compared to the return on the Nasdaq Composite Total Return Index (the "XCMP"). If the Company's return is positive and meets or exceeds the indexed return, the number of non-vested stock units earned will be based on interpolation, with the maximum number of non-vested stock units earned pursuant to the award capped at 200% of the target number of non-vested stock units set forth in the award agreement if the Company's return exceeds the indexed return by 40% or more. If the Company's return over the performance period is positive but underperforms the index, a number of non-vested stock units will be issued, below the target award, based on interpolation; however, no non-vested stock units will be issued if the Company's return underperforms the index by more than 20% over the performance period. In the event the Company's return to stockholders is negative but still meets or exceeds the indexed return, only 75% of the target award shall be issued. 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. 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 2016 Grant January 2016 Grant March 2015 Grant Expected volatility factor 0.29 - 0.39 0.29 - 0.37 0.14 - 0.29 Risk free interest rate 0.91 % 1.10 % 0.85 % Expected dividend yield 0 % 0 % 0 % 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. For the March 2015 grant, the range of expected volatilities utilized was based on the historical volatilities of the Company's common stock and the XCMP. 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 the XCMP in order to model the stock price movements. The volatilities used were calculated over a 2.76 year period, which was the remaining term of the 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 remaining 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 the award as of the date of grant was $61.01 . 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. Performance Stock Units During 2015, the Company awarded certain senior level employees non-vested performance stock units granted under the 2014 Plan. The number of non-vested stock units underlying each award will be determined within sixty days of the calendar year following completion of the one -year performance period ending December 31, 2016 and will be based on achievement of a specific corporate financial performance goal determined at the time of the award. The number of non-vested stock units issued will be based on a graduated slope, with the maximum number of non-vested stock units issuable pursuant to the award capped at 100% of the base number of non-vested stock units set forth in the award agreement. The Company is required to estimate the attainment expected to be achieved related to the defined performance goals and the number of non-vested stock units that will ultimately be awarded in order to recognize compensation expense over the vesting period. Each non-vested stock unit, upon vesting, represents the right to receive one share of the Company’s common stock. If the performance goals are not met, no compensation cost will be recognized and any previously recognized compensation cost will be reversed. Unrecognized Compensation Related to Stock Units As of September 30, 2016 , 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 4,904,470 . As of September 30, 2016 , there was $243.3 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 1.99 years. See Note 4 for more information regarding the Company's acquisitions. Non-vested Stock During the nine months ended September 30, 2016 , the Company granted non-vested stock awards of 118,588 shares to certain executive officers which typically vest between one to three years from the date of grant, subject to the holder’s continued employment with the Company. 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 nine months ended September 30, 2016 , the Company recognized $2.8 million and $8.2 million , respectively, of stock-based compensation expense related to non-vested stock awards. At September 30, 2016 , there was approximately $6.7 million of total unrecognized compensation expense related to these awards, which is expected to be recognized over a weighted average period of 2.03 years.

Goodwill And Other Intangible A

Goodwill And Other Intangible Assets	9 Months Ended
	Sep. 30, 2016
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. 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 2015 . There were no indicators of impairment during the nine months ended September 30, 2016 . See Note 4 for more information regarding the Company's acquisitions and Note 9 for more information regarding the Company's segments. As part of its continued transformation, effective January 1, 2016, the Company reorganized a part of its business by creating a new Cloud Services business unit, which resulted in a change in segment composition. In connection with this change, during the first quarter of 2016, the Company performed an assessment of its goodwill reporting units and determined that the recent Cloud Services reorganization resulted in the identification of three goodwill reporting units (Enterprise and Service Provider excluding Cloud Services, Cloud Services and GoTo Business). The identification of these reporting units triggered a reallocation of goodwill as of January 1, 2016 based on the relative fair value approach. The Company’s reportable segments remain unchanged. The following table presents the change in goodwill allocated to the Company’s reportable segments during the nine months ended September 30, 2016 (in thousands): Balance at January 1, 2016 Additions Other Balance at September 30, 2016 Enterprise and Service Provider $ 1,581,805 (1) $ 2,927 (2) $ (625 ) (3) $ 1,584,107 GoTo Business 380,917 (1) — — 380,917 Consolidated $ 1,962,722 $ 2,927 $ (625 ) $ 1,965,024 (1) Beginning balance as of January 1, 2016 adjusted to reflect the Company’s re-alignment of its reporting unit structure. The change resulted in a goodwill reallocation of $86.5 million from the GoTo Business segment into the Enterprise and Service Provider segment. (2) Amount relates to preliminary purchase price allocation of goodwill associated with the 2016 business combination. See Note 4 for more information regarding the Company's acquisitions. (3) Amount relates to goodwill associated with the sale of the Company’s CloudPlatform and CloudPortal Business Manager products and to adjustments to the preliminary purchase price allocation associated with 2015 acquisitions. See Note 4 for more information regarding the Company's acquisitions and divestitures. 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): September 30, 2016 December 31, 2015 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Product related intangible assets $ 602,060 $ 499,231 $ 589,847 $ 476,141 Other 449,560 304,997 447,816 278,104 Total $ 1,051,620 $ 804,228 $ 1,037,663 $ 754,245 Amortization of product-related intangible assets, which consists primarily of product-related technologies and patents, was $15.0 million and $19.1 million for the three months ended September 30, 2016 and 2015 , respectively, and $45.7 million and $56.2 million for the nine months ended September 30, 2016 and 2015 , respectively, and is classified as a component of Cost of net revenues in the accompanying condensed consolidated statements of income. Amortization of other intangible assets, which consist primarily of customer relationships, trade names and covenants not to compete was $7.4 million and $12.5 million for the three months ended September 30, 2016 and 2015 , respectively, and $22.1 million and $33.0 million for the nine months ended September 30, 2016 and 2015 , respectively, and is classified as a component of Operating expenses in the accompanying condensed consolidated statements of income. The Company monitors its intangible assets for indicators of impairment. If the Company determines 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. During the nine months ended September 30, 2015 , due to disruptions in the business as a result of the announced plan to explore strategic alternatives, the Company identified certain definite-lived intangible assets, primarily customer relationships from the acquisition of ByteMobile, that were impaired within the Enterprise and Service Provider business unit and recorded non-cash impairment charges of $65.4 million to write down the intangible assets to their estimated fair value of $27.6 million . Of the impairment charge, $64.4 million is included in Impairment of other intangible assets and $1.0 million is included in Impairment of product related intangible assets in the accompanying condensed consolidated statements of income. This non-recurring fair value measurement was categorized as Level 3, as significant unobservable inputs were used in the valuation analysis. Key assumptions used in the valuation include forecasts of revenue and expenses over an extended period of time, customer retention rates, tax rates, and estimated costs of debt and equity capital to discount the projected cash flows. Certain of these assumptions involve significant judgment, are based on management’s estimate of current and forecasted market conditions and are sensitive and susceptible to change, therefore , further disruptions in the business could result in additional amounts becoming impaired. Estimated future amortization expense of intangible assets with finite lives as of September 30, 2016 is as follows (in thousands): Year ending December 31, Amount 2016 (remaining three months) $ 20,558 2017 69,636 2018 62,135 2019 39,594 2020 20,943 Thereafter 34,526 Total $ 247,392

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION The Enterprise and Service Provider and the GoTo business units constitute the Company’s two reportable segments. The Company does not engage in intercompany revenue transfers between segments. The Company’s chief operating decision maker (“CODM”) evaluates the Company’s performance based primarily on profitability from its Enterprise and Service Provider and GoTo Business segment products. The Company's CEO is the CODM. Segment profit for each segment includes certain research and development, sales, marketing and services and general and administrative expenses directly attributable to the segment as well as other corporate costs allocated to the segment and excludes certain expenses that are managed outside of the reportable segments. Costs excluded from segment profit primarily consist of certain restructuring charges, stock-based compensation costs, charges or benefits related to significant litigation that are not anticipated to be ongoing costs, amortization and impairment of product and other related intangible assets, net interest and other expense, net and separation costs. Accounting policies of the Company’s segments are the same as its consolidated accounting policies. As part of its continued transformation, effective January 1, 2016, the Company reorganized a part of its business by creating a new Cloud Services business unit that primarily includes the ShareFile product line. Prior to 2016, the ShareFile product line was included within the Company's Workflow Cloud products under the GoTo Business segment. The Company's CODM has changed how it views the business primarily due to operational initiatives announced in 2015, which include increased emphasis and investments in core enterprise products for secure and reliable application and data delivery. As a result, the Company realigned its Cloud Services products and services to the Enterprise and Service Provider segment effective January 1, 2016 in contemplation of the strategic shift and the proposed separation of the GoTo Business. See Note 18 for more information on the Company's proposed separation of its GoTo Business. In addition, previously reported segment results have been recast to conform to the 2016 presentation. Net revenues and segment profit, classified by the Company’s two reportable segments were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Net revenues: Enterprise and Service Provider $ 668,736 $ 649,185 $ 2,001,496 $ 1,906,223 GoTo Business 172,515 164,085 508,413 464,608 Consolidated $ 841,251 $ 813,270 $ 2,509,909 $ 2,370,831 Segment profit: Enterprise and Service Provider $ 209,991 $ 175,488 $ 621,930 $ 454,088 GoTo Business 45,233 37,785 109,412 103,465 Unallocated expenses (1) : Amortization and impairment of intangible assets (23,474 ) (97,038 ) (68,939 ) (154,931 ) Stock-based compensation (48,282 ) (38,671 ) (136,202 ) (103,674 ) Restructuring (12,061 ) (13,766 ) (62,142 ) (62,251 ) Separation (17,580 ) — (46,190 ) — Other — — — 982 Net interest and other expense, net (6,567 ) (10,440 ) (22,279 ) (37,997 ) Consolidated income before income taxes $ 147,260 $ 53,358 $ 395,590 $ 199,682 (1) Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments. Revenues by Product Grouping Revenues by product grouping for the Company’s Enterprise and Service Provider and GoTo business units were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Net revenues: Enterprise and Service Provider Workspace Services revenues (1) $ 414,394 $ 394,523 $ 1,227,172 $ 1,188,186 Delivery Networking revenues (2) 191,243 189,746 581,612 527,987 Cloud Services revenues (3) 33,185 26,448 95,229 73,142 Professional services (4) 29,851 36,675 97,310 110,575 Other 63 1,793 173 6,333 Total Enterprise and Service Provider revenues 668,736 649,185 2,001,496 1,906,223 GoTo Business revenues 172,515 164,085 508,413 464,608 Total net revenues $ 841,251 $ 813,270 $ 2,509,909 $ 2,370,831 (1) Workspace Services revenues are primarily comprised of sales from the Company’s windows app delivery products, which include XenDesktop and XenApp, and the Company's mobile app delivery products, which include XenMobile and related license updates and maintenance and support. (2) Delivery Networking revenues primarily include NetScaler, ByteMobile Smart Capacity and CloudBridge products and related license updates and maintenance and support. (3) Cloud Services revenues primarily include ShareFile, Podio and Citrix Cloud products. (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 segment and geographic location, for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Net revenues: Enterprise and Service Provider Americas $ 397,349 $ 369,574 $ 1,188,719 $ 1,072,092 EMEA 199,837 208,224 611,832 621,582 Asia-Pacific 71,550 71,387 200,945 212,549 Total Enterprise and Service Provider revenues 668,736 649,185 2,001,496 1,906,223 GoTo Business Americas 144,682 135,922 428,760 386,547 EMEA 22,356 22,632 64,888 62,819 Asia-Pacific 5,477 5,531 14,765 15,242 Total GoTo Business revenues 172,515 164,085 508,413 464,608 Total net revenues $ 841,251 $ 813,270 $ 2,509,909 $ 2,370,831

Convertible Senior Notes

Convertible Senior Notes	9 Months Ended
	Sep. 30, 2016
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 conversion rate for the Convertible Notes is 11.1111 shares of common stock per $1,000 principal amount of Convertible Notes, which corresponds to a conversion price of approximately $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. 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 $1.34 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 proposed 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 will be 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 September 30, 2016. The conversion rate for the Convertible Notes, Convertible Note Hedge and Warrant Transactions also will be subject to adjustment as of the opening of business on the ex-dividend date for the distribution. The $1.44 billion Convertible Notes became convertible with the notice to noteholders. Accordingly, as of September 30, 2016 , the carrying amount of the Convertible Notes of $1.34 billion was reclassified from Other liabilities to Current liabilities and the difference between the face value and carrying value of $87.8 million was reclassified from stockholders’ equity to temporary equity in the accompanying condensed consolidated balance sheets. See Note 18 for more information on the Company's proposed separation of its GoTo Business. The Convertible Notes consist of the following (in thousands): September 30, 2016 December 31, 2015 Liability component Principal $ 1,437,500 $ 1,437,500 Less: note discount and issuance costs (98,718 ) (126,429 ) Net carrying amount $ 1,338,782 $ 1,311,071 Equity component Temporary equity $ 87,841 $ — Additional paid-in capital 75,028 162,869 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 Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Contractual interest expense $ 1,797 $ 1,797 $ 5,391 $ 5,391 Amortization of debt issuance costs 1,021 997 3,045 2,971 Amortization of debt discount 8,284 8,039 24,667 23,939 $ 11,102 $ 10,833 $ 33,103 $ 32,301 See Note 6 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 "Initial Warrant Transactions") with each of the Option Counterparties relating to approximately 16.0 million shares of common stock. 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. 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 September 30, 2016 , 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	9 Months Ended
	Sep. 30, 2016
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 1.82% . As of September 30, 2016 , there were no amounts 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 September 30, 2016 .

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS Derivatives Designated as Hedging Instruments As of September 30, 2016 , 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 loss on cash flow derivative instruments was $0.2 million at September 30, 2016 and $2.3 million at December 31, 2015 , and is included in Accumulated other comprehensive loss in the accompanying condensed consolidated balance sheets. See Note 13 for more information related to comprehensive income. The net unrealized loss as of September 30, 2016 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 income (expense), net. Fair Values of Derivative Instruments Asset Derivatives Liability Derivatives (In thousands) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 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 $1,476 Prepaid expenses and other current assets $436 Accrued expenses and other current liabilities $1,690 Accrued expenses and other current liabilities $2,895 Asset Derivatives Liability Derivatives (In thousands) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 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 $425 Prepaid expenses and other current assets $627 Accrued expenses and other current liabilities $674 Accrued expenses and other current liabilities $783 The Effect of Derivative Instruments on Financial Performance For the Three Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Comprehensive (Loss)Income (Effective Portion) Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2016 2015 2016 2015 Foreign currency forward contracts $ 1,023 $ (554 ) Operating expenses $ (641 ) $ (1,794 ) For the Nine Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain Recognized in Other Comprehensive (Loss) Income (Effective Portion) Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2016 2015 2016 2015 Foreign currency forward contracts $ 2,049 $ 5,770 Operating expenses $ (1,663 ) $ (11,462 ) There was no material ineffectiveness in the Company’s foreign currency hedging program in the periods presented. For the Three Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Derivative Amount of (Loss) Gain Recognized in Income on Derivative 2016 2015 Foreign currency forward contracts Other expense, net $ (1,693 ) $ 1,238 For the Nine Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Derivative Amount of (Loss) Gain Recognized in Income on Derivative 2016 2015 Foreign currency forward contracts Other expense, net $ (5,658 ) $ 1,727 Outstanding Foreign Currency Forward Contracts As of September 30, 2016 , the Company had the following net notional foreign currency forward contracts outstanding (in thousands): Foreign Currency Currency Denomination Australian Dollar AUD 14,700 Brazilian Real BRL 7,800 Pounds Sterling GBP 2,567 Canadian Dollar CAD 1,450 Chinese Yuan Renminbi CNY 33,800 Danish Krone DKK 20,276 Euro EUR 23,832 Hong Kong Dollar HKD 32,500 Indian Rupee INR 320,873 Japanese Yen JPY 1,321,457 Singapore Dollar SGD 10,097 Swiss Franc CHF 32,000

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2016
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, 2015 $ (16,346 ) $ (2,900 ) $ (2,255 ) $ (7,026 ) $ (28,527 ) Other comprehensive income before reclassifications — 4,863 386 — 5,249 Amounts reclassified from accumulated other comprehensive loss — (1,220 ) 1,663 — 443 Net current period other comprehensive income — 3,643 2,049 — 5,692 Balance at September 30, 2016 $ (16,346 ) $ 743 $ (206 ) $ (7,026 ) $ (22,835 ) Income tax expense or benefit allocated to each component of other comprehensive loss is not material. Reclassifications out of Accumulated other comprehensive loss are as follows: For the Three Months Ended September 30, 2016 (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 $ (928 ) Other income (expense), net Unrealized net losses on cash flow hedges 641 Operating expenses * $ (287 ) For the Nine Months Ended September 30, 2016 (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 $ (1,220 ) Other income (expense), net Unrealized net losses on cash flow hedges 1,663 Operating expenses * $ 443 * Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2016
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. The Company’s effective tax rate was approximately 10.4% and (4.8)% for the three months ended September 30, 2016 and 2015 , respectively and 15.0% and 5.8% for the nine months ended September 30, 2016 and 2015 , respectively. The increase in the effective tax rate when comparing the three months ended September 30, 2016 to the three months ended September 30, 2015 was primarily due to a change in the mix of income between the Company’s U.S. and foreign operations driven by impairment charges of certain domestic intangible assets recorded in the third quarter of 2015 . The increase in the effective tax rate when comparing the nine months ended September 30, 2016 to the nine months ended September 30, 2015 , was primarily due to the impact of settling the IRS examination for the tax years 2011 and 2012 that closed during the quarter ended June 30, 2015, and the impact of the intangible asset impairment recorded in the three months ended September 30, 2015 . The Company’s net unrecognized tax benefits totaled approximately $65.8 million and $54.6 million as of September 30, 2016 and December 31, 2015 , respectively. All amounts included in the balance at September 30, 2016 for tax positions would affect the annual effective tax rate if recognized. The Company has $2.2 million accrued for the payment of interest and penalties as of September 30, 2016 . The Company and one or more of its subsidiaries are subject to federal income taxes in the United States, as well as income taxes of multiple state and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years prior to 2012. 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 and cash flows. At September 30, 2016 , the Company had approximately $229.5 million in net deferred tax assets. The authoritative guidance requires a valuation allowance to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company reviews deferred tax assets periodically for recoverability and makes estimates and judgments regarding the expected geographic sources of taxable income and gains from investments, as well as tax planning strategies in assessing the need for a valuation allowance. During the quarter ended September 30, 2016 , the Company did not record a change in the Company's valuation allowance. 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	9 Months Ended
	Sep. 30, 2016
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 $6.3 billion , of which $400.0 million was approved in January 2016. The Company may use the approved dollar authority to repurchase stock at any time until the approved amount is exhausted. The objective of the Company’s stock repurchase program is to improve stockholders’ returns. At September 30, 2016 , approximately $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 September 30, 2016 , the Company had no open market purchases. During the nine months ended September 30, 2016 , the Company expended approximately $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 . During the three months ended September 30, 2015 , the Company expended approximately $279.5 million on open market purchases under the stock repurchase program, repurchasing 3,895,283 shares of outstanding common stock at an average price of $71.75 . During the nine months ended September 30, 2015 , the Company expended approximately $451.6 million on open market purchases under the stock repurchase program, repurchasing 6,588,783 shares of outstanding common stock at an average price of $68.54 . Of the amount expended, $53.6 million had not yet settled as of September 30, 2015 and therefore was excluded from the amount reflected in Stock repurchases, net in the Condensed Consolidated Statements of Cash Flows as it is considered a non-cash item. Shares for Tax Withholding During the three months ended September 30, 2016 , the Company withheld 134,782 shares from equity awards that vested, totaling $12.0 million , to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. During the nine months ended September 30, 2016 , the Company withheld 698,391 shares from equity awards that vested, totaling $55.0 million , to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. During the three months ended September 30, 2015 , the Company withheld 55,963 shares from equity awards that vested, totaling $4.1 million , to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. During the nine months ended September 30, 2015 , the Company withheld 501,785 shares from equity awards that vested, totaling $32.4 million , to satisfy minimum tax withholding obligations that arose on the vesting of such equity awards. These shares are reflected as treasury stock in the Company’s condensed consolidated balance sheets and the related cash outlays do not reduce the Company’s total stock repurchase authority.

Commitments And Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2016
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 Other 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. In the third quarter of 2016, the previously disclosed purported shareholder derivative action initiated by John Calma against certain of the directors of the Company, and against the Company as a nominal defendant, alleging breach of fiduciary duty, waste of corporate assets and unjust enrichment related to stock awards that they received under the Company's director compensation program, was settled and dismissed. No defendant was required to make any monetary contribution to the settlement nor concede any wrongdoing as part of the settlement. The settlement provided for an award of attorneys’ fees to plaintiff’s counsel. Due to the nature of the Company's business, the Company is subject to patent infringement claims, including current suits against it or one or more of its wholly-owned subsidiaries 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	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
RESTRUCTURING	RESTRUCTURING 2015 Other Restructuring Program On November 17, 2015, the Company announced the implementation of a restructuring program designed to simplify the Company’s enterprise go-to-market motion and roles while improving coverage, reflect changes in the Company’s product focus, and balance resources with demand across the Company’s marketing, general and administration areas. The 2015 Other Restructuring Program eliminated approximately 700 full-time positions, of which 350 were communicated in 2015 and 350 in the first quarter of 2016. During the three and nine months ended September 30, 2016 , the Company incurred costs of $4.4 million and $47.7 million , respectively, associated with the program. The majority of these charges are related to employee severance, outplacement, professional service fees, and facility closing costs. The majority of the activities related to the 2015 Other Restructuring Program were substantially completed as of the end of the first quarter of 2016. As of September 30, 2016 , total charges related to the 2015 Other Restructuring Program incurred since inception were $77.4 million . 2015 Restructuring Program On January 28, 2015, the Company announced the implementation of a restructuring program designed to increase strategic focus and operational efficiency and began to execute against the program in February 2015. As a result, the Company eliminated approximately 700 full-time positions in the first half of 2015. During the three and nine months ended September 30, 2016 , the Company recorded charges of $7.6 million and $14.6 million , respectively, primarily related to the consolidation of leased facilities. The majority of the activities related to the 2015 Restructuring Program were substantially completed by the end of 2015. As of September 30, 2016 , total charges related to the 2015 Restructuring Program incurred since inception were $83.5 million . Restructuring Charges by Segment Restructuring charges by segment consists of the following (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 2014 Restructuring Program Enterprise and Service Provider $ — $ (263 ) $ (177 ) $ 1,747 GoTo Business — — — 50 2015 Restructuring Program Enterprise and Service Provider 7,625 13,714 14,716 59,580 GoTo Business — 315 (79 ) 874 2015 Other Restructuring Program Enterprise and Service Provider 4,551 — 46,772 — GoTo Business (115 ) — 910 — Total restructuring charges $ 12,061 $ 13,766 $ 62,142 $ 62,251 Restructuring accruals The activity in the Company’s restructuring accruals for the nine months ended September 30, 2016 is summarized as follows (in thousands): 2014 Restructuring Program 2015 Restructuring Program 2015 Other Restructuring Program Total Balance at January 1, 2016 $ 1,121 $ 22,694 $ 16,581 $ 40,396 Employee severance and related costs — 72 43,238 43,310 Consolidation of leased facilities — 14,706 4,442 19,148 Payments (9 ) (7,952 ) (59,646 ) (67,607 ) Reversal of previous charges (177 ) (141 ) — (318 ) Other — — 1,158 1,158 Balance at September 30, 2016 $ 935 $ 29,379 $ 5,773 $ 36,087 As of September 30, 2016 , the $36.1 million in outstanding restructuring accruals primarily relates to the Enterprise and Service Provider segment.

Proposed Separation of GoTo Bus

Proposed Separation of GoTo Business	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Proposed Separation of GoTo Business	PROPOSED SEPARATION OF GOTO BUSINESS The Company announced in November 2015 that it was pursuing a plan to spinoff its GoTo family of products into a separate, publicly traded company. The company established as a result of the spinoff would be made up of the following products and services: GoToAssist, GoToMeeting, GoToMyPC, GoToTraining, GoToWebinar, Grasshopper and OpenVoice. The proposed separation, which was intended to be a tax-free spinoff to the Company's stockholders, was expected to be completed in the second half of 2016. The proposed spinoff was subject to certain conditions, including, among others, obtaining final approval from the Company's Board of Directors, receipt of a favorable opinion and/or rulings with respect to the tax-free nature of the transaction for federal income tax purposes and the effectiveness of a Form 10 filing with the SEC. On July 26, 2016, the Company entered into definitive agreements with GetGo, Inc., its wholly-owned subsidiary (“GetGo”), and LogMeIn, Inc., a Delaware corporation (“LogMeIn”), with respect to a RMT transaction. Subject to the terms and conditions of those agreements, (1) the Company will transfer its GoTo Business to GetGo, (2) after which, the Company will distribute to its stockholders all of the issued and outstanding shares of common stock of GetGo held by the Company, at the Company’s sole option, by way of a pro rata dividend or an exchange offer, and (3) immediately after the distribution, Lithium Merger Sub, Inc., a wholly-owned subsidiary of LogMeIn, will merge with and into GetGo, with GetGo as the surviving corporation. In connection with the merger, GetGo (which at that time will hold the GoTo Business) will become a wholly-owned subsidiary of LogMeIn, and GetGo’s stockholders will receive an aggregate of approximately 26.9 million shares of LogMeIn common stock. On August 31, 2016, pursuant to the terms of the definitive agreements, Citrix notified LogMeIn that it has elected to effect the distribution through a spin-off. On September 26, 2016, LogMeIn announced the early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act for the proposed merger. Completion of the transaction remains subject to the satisfaction or waiver of customary closing conditions, including receipt of approval of LogMeIn stockholders, other regulatory approvals and opinions of tax counsel. The proposed transaction, which is intended to be tax-free to the Company and its stockholders for U.S. federal income tax purposes, is expected to be completed in the first quarter of 2017. The Company has incurred significant costs in connection with the planned 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. Costs related to employee retention or stock-based compensation are classified on a basis consistent with their regular compensation charges and included within Cost of net revenues, Research and development, Sales, marketing and services, or General and administrative expense in the condensed consolidated statements of income as applicable. Costs other than those related to employees are included within Separation expense in the condensed consolidated statements of income. During the three and nine months ended September 30, 2016 , the Company incurred approximately $17.6 million and $46.2 million , respectively, related to separation costs. As of September 30, 2016 , the Company has incurred total separation costs of $52.5 million . The Company expects to incur additional separation costs in 2016 and 2017 until it completes the separation and proposed merger of the GoTo Business with LogMeIn. The Company currently expects to incur, in the aggregate, approximately $120.0 million to $130.0 million in separation costs, although that estimate is subject to a number of assumptions and uncertainties and the actual amount of separation costs could differ materially from this estimate. These estimates do not include potential tax related charges or potential capital expenditures which may be incurred related to the proposed transaction. These additional costs could be significant.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS 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 is currently evaluating the effect that this standard will have on its condensed consolidated financial statements and related disclosures. In March 2016, the Financial Accounting Standards Board issued an accounting standard update on the accounting of 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 new guidance is effective for annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the potential impact of this standard on its financial position and results of operations. 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. In April 2015, the Financial Accounting Standards Board issued an accounting standard update on the presentation of debt issuance costs. The new guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The Company adopted this standard effective January 1, 2016 and retroactively adjusted the long-term debt liability presented as of December 31, 2015 by reducing the long-term debt liability by the amount of the deferred financing costs of $13.9 million and reducing the deferred financing costs asset included in other assets on the condensed consolidated balance sheets by a corresponding amount. The adoption of this standard did not have a material impact on the Company's consolidated financial position, results of operations and cash flows. In April 2015, Financial Accounting Standards Board issued an accounting standard update on customer's accounting for fees paid in a cloud computing arrangement. The amendments in this update provide guidance about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The Company adopted this standard effective January 1, 2016 on a prospective basis. Adoption of this standard did not have a material impact on the Company's financial position and 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 initiated an assessment of its systems, data and processes related to the implementation of this accounting standard, which is expected to be completed during 2016. The Company is currently evaluating the potential impact of this standard on its financial position and results of operations.

Significant Accounting Polici26

Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015 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 5 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, which is typically 12 months. In addition, SaaS revenues may also include set-up fees, which are 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 is a renewable program that provides subscribers with immediate access to software upgrades, enhancements and maintenance releases when and if they become available during the term of the contract. 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 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 during the term of the contract. 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: persuasive evidence of the arrangement exists; delivery has occurred or the service has been provided and the Company has no remaining obligations; the fee is fixed or determinable; and 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 Company’s GoTo Business products and a majority of Cloud Services are considered hosted service arrangements per the authoritative guidance, or SaaS. Generally, the Company’s GoTo Business products are sold separately and not bundled with the Enterprise and Service Provider business unit’s products and services. In the normal course of business, the Company is not obligated to accept product returns from its distributors 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 approximately $1.2 million and $1.4 million at September 30, 2016 and December 31, 2015 , 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. Effective January 1, 2015, the functional currency of the Company’s wholly-owned foreign subsidiaries of its GoTo Business segment became the U.S. dollar as a result of a reorganization in the foreign subsidiaries' operations. Prior to January 1, 2015, the functional currency of the Company’s wholly-owned foreign subsidiaries of its GoTo Business segment 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. The change in functional currency is applied on a prospective basis, therefore a ny gains and losses that were previously recorded in Accumulated other comprehensive loss remain unchanged from January 1, 2015. 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. See Note 9 for information on the Company's Enterprise and Service Provider and GoTo Business segments.
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 7 for further information regarding the Company’s stock-based compensation plans.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income Per Share Basic And Diluted	The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share information): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Numerator: Net income $ 131,901 $ 55,925 $ 336,262 $ 188,087 Denominator: Denominator for basic earnings per share - weighted-average shares outstanding 155,525 160,359 154,847 160,359 Effect of dilutive employee stock awards 2,007 1,418 1,850 1,357 Denominator for diluted earnings per share - weighted-average shares outstanding 157,532 161,777 156,697 161,716 Basic earnings per share $ 0.85 $ 0.35 $ 2.17 $ 1.17 Diluted earnings per share $ 0.84 $ 0.35 $ 2.15 $ 1.16 Anti-dilutive weighted-average shares from stock awards 60 1,572 460 2,416

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2016
Investments [Abstract]
Schedule of investments in available-for-sale securities at fair values	Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands): September 30, 2016 December 31, 2015 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 $ 376,248 $ 727 $ (206 ) $ 376,769 $ 530,981 $ 757 $ (1,216 ) $ 530,522 Corporate securities 606,851 855 (357 ) 607,349 699,210 90 (1,929 ) 697,371 Municipal securities 9,990 15 — 10,005 14,872 14 (8 ) 14,878 Government securities 149,252 89 (98 ) 149,243 152,376 9 (340 ) 152,045 Total $ 1,142,341 $ 1,686 $ (661 ) $ 1,143,366 $ 1,397,439 $ 870 $ (3,493 ) $ 1,394,816

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value Disclosures [Abstract]
Assets And Liabilities Measured At Fair Value On A Recurring Basis	Assets and Liabilities Measured at Fair Value on a Recurring Basis As of September 30, 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 $ 498,627 $ 498,627 $ — $ — Money market funds 797,035 797,035 — — Corporate securities 13,021 — 13,021 — Available-for-sale securities: Agency securities 376,769 — 376,769 — Corporate securities 607,349 — 606,201 1,148 Municipal securities 10,005 — 10,005 — Government securities 149,243 — 149,243 — Prepaid expenses and other current assets: Foreign currency derivatives 1,902 — 1,902 — Total assets $ 2,453,951 $ 1,295,662 $ 1,157,141 $ 1,148 Accrued expenses and other current liabilities: Foreign currency derivatives 2,364 — 2,364 — Total liabilities $ 2,364 $ — $ 2,364 $ — As of December 31, 2015 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 $ 261,962 $ 261,962 $ — $ — Money market funds 102,968 102,968 — — Corporate securities 3,588 — 3,588 — Available-for-sale securities: Agency securities 530,522 — 530,522 — Corporate securities 697,371 — 695,809 1,562 Municipal securities 14,878 — 14,878 — Government securities 152,045 — 152,045 — Prepaid expenses and other current assets: Foreign currency derivatives 1,063 — 1,063 — Total assets $ 1,764,397 $ 364,930 $ 1,397,905 $ 1,562 Accrued expenses and other current liabilities: Foreign currency derivatives 3,678 — 3,678 — Total liabilities $ 3,678 $ — $ 3,678 $ —
Fair Value, by Balance Sheet Grouping	As of September 30, 2016 , 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 September 30, 2016 , 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 $ 1,583,550 $ 1,338,782

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2016
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: Three Months Ended Nine Months Ended September 30, 2016 September 30, 2015 September 30, 2016 September 30, 2015 Expected volatility factor 0.27 - 0.41 0.35 0.27 - 0.41 0.35 Risk free interest rate 0.35% - 0.42% 0.25 % 0.25% - 0.42% 0.25 % Expected dividend yield 0 % 0 % 0 % 0 % Expected life (in years) 0.5 0.5 0.5 0.5
Schedule of Total Stock-based Compensation Recognized by Income Statement Classification	The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands): Three Months Ended Nine Months Ended Income Statement Classifications September 30, 2016 September 30, 2015 September 30, 2016 September 30, 2015 Cost of services and maintenance revenues $ 911 $ 803 $ 2,561 $ 2,095 Research and development 13,256 9,118 35,878 31,454 Sales, marketing and services 14,848 16,922 41,442 38,083 General and administrative 19,267 11,828 56,321 32,042 Total $ 48,282 $ 38,671 $ 136,202 $ 103,674
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 2016 Grant January 2016 Grant March 2015 Grant Expected volatility factor 0.29 - 0.39 0.29 - 0.37 0.14 - 0.29 Risk free interest rate 0.91 % 1.10 % 0.85 % Expected dividend yield 0 % 0 % 0 %

Goodwill And Other Intangible31

Goodwill And Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of The Change In Goodwill	The following table presents the change in goodwill allocated to the Company’s reportable segments during the nine months ended September 30, 2016 (in thousands): Balance at January 1, 2016 Additions Other Balance at September 30, 2016 Enterprise and Service Provider $ 1,581,805 (1) $ 2,927 (2) $ (625 ) (3) $ 1,584,107 GoTo Business 380,917 (1) — — 380,917 Consolidated $ 1,962,722 $ 2,927 $ (625 ) $ 1,965,024 (1) Beginning balance as of January 1, 2016 adjusted to reflect the Company’s re-alignment of its reporting unit structure. The change resulted in a goodwill reallocation of $86.5 million from the GoTo Business segment into the Enterprise and Service Provider segment. (2) Amount relates to preliminary purchase price allocation of goodwill associated with the 2016 business combination. See Note 4 for more information regarding the Company's acquisitions. (3) Amount relates to goodwill associated with the sale of the Company’s CloudPlatform and CloudPortal Business Manager products and to adjustments to the preliminary purchase price allocation associated with 2015 acquisitions. See Note 4 for more information regarding the Company's acquisitions and divestitures.
Schedule Of Intangible Assets	Intangible assets consist of the following (in thousands): September 30, 2016 December 31, 2015 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Product related intangible assets $ 602,060 $ 499,231 $ 589,847 $ 476,141 Other 449,560 304,997 447,816 278,104 Total $ 1,051,620 $ 804,228 $ 1,037,663 $ 754,245
Schedule Of Estimated Future Amortization Expense	Estimated future amortization expense of intangible assets with finite lives as of September 30, 2016 is as follows (in thousands): Year ending December 31, Amount 2016 (remaining three months) $ 20,558 2017 69,636 2018 62,135 2019 39,594 2020 20,943 Thereafter 34,526 Total $ 247,392

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Net Revenues And Profit By Segment	Net revenues and segment profit, classified by the Company’s two reportable segments were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Net revenues: Enterprise and Service Provider $ 668,736 $ 649,185 $ 2,001,496 $ 1,906,223 GoTo Business 172,515 164,085 508,413 464,608 Consolidated $ 841,251 $ 813,270 $ 2,509,909 $ 2,370,831 Segment profit: Enterprise and Service Provider $ 209,991 $ 175,488 $ 621,930 $ 454,088 GoTo Business 45,233 37,785 109,412 103,465 Unallocated expenses (1) : Amortization and impairment of intangible assets (23,474 ) (97,038 ) (68,939 ) (154,931 ) Stock-based compensation (48,282 ) (38,671 ) (136,202 ) (103,674 ) Restructuring (12,061 ) (13,766 ) (62,142 ) (62,251 ) Separation (17,580 ) — (46,190 ) — Other — — — 982 Net interest and other expense, net (6,567 ) (10,440 ) (22,279 ) (37,997 ) Consolidated income before income taxes $ 147,260 $ 53,358 $ 395,590 $ 199,682 (1) Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.
Revenue by Product Grouping	Revenues by product grouping for the Company’s Enterprise and Service Provider and GoTo business units were as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Net revenues: Enterprise and Service Provider Workspace Services revenues (1) $ 414,394 $ 394,523 $ 1,227,172 $ 1,188,186 Delivery Networking revenues (2) 191,243 189,746 581,612 527,987 Cloud Services revenues (3) 33,185 26,448 95,229 73,142 Professional services (4) 29,851 36,675 97,310 110,575 Other 63 1,793 173 6,333 Total Enterprise and Service Provider revenues 668,736 649,185 2,001,496 1,906,223 GoTo Business revenues 172,515 164,085 508,413 464,608 Total net revenues $ 841,251 $ 813,270 $ 2,509,909 $ 2,370,831 (1) Workspace Services revenues are primarily comprised of sales from the Company’s windows app delivery products, which include XenDesktop and XenApp, and the Company's mobile app delivery products, which include XenMobile and related license updates and maintenance and support. (2) Delivery Networking revenues primarily include NetScaler, ByteMobile Smart Capacity and CloudBridge products and related license updates and maintenance and support. (3) Cloud Services revenues primarily include ShareFile, Podio and Citrix Cloud products. (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 segment and geographic location, for the following periods (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Net revenues: Enterprise and Service Provider Americas $ 397,349 $ 369,574 $ 1,188,719 $ 1,072,092 EMEA 199,837 208,224 611,832 621,582 Asia-Pacific 71,550 71,387 200,945 212,549 Total Enterprise and Service Provider revenues 668,736 649,185 2,001,496 1,906,223 GoTo Business Americas 144,682 135,922 428,760 386,547 EMEA 22,356 22,632 64,888 62,819 Asia-Pacific 5,477 5,531 14,765 15,242 Total GoTo Business revenues 172,515 164,085 508,413 464,608 Total net revenues $ 841,251 $ 813,270 $ 2,509,909 $ 2,370,831

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Convertible Debt	The Convertible Notes consist of the following (in thousands): September 30, 2016 December 31, 2015 Liability component Principal $ 1,437,500 $ 1,437,500 Less: note discount and issuance costs (98,718 ) (126,429 ) Net carrying amount $ 1,338,782 $ 1,311,071 Equity component Temporary equity $ 87,841 $ — Additional paid-in capital 75,028 162,869 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 Nine Months Ended September 30, September 30, 2016 2015 2016 2015 Contractual interest expense $ 1,797 $ 1,797 $ 5,391 $ 5,391 Amortization of debt issuance costs 1,021 997 3,045 2,971 Amortization of debt discount 8,284 8,039 24,667 23,939 $ 11,102 $ 10,833 $ 33,103 $ 32,301

Derivative Financial Instrume34

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule Of The Fair Values Of Derivative Instruments	Fair Values of Derivative Instruments Asset Derivatives Liability Derivatives (In thousands) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 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 $1,476 Prepaid expenses and other current assets $436 Accrued expenses and other current liabilities $1,690 Accrued expenses and other current liabilities $2,895 Asset Derivatives Liability Derivatives (In thousands) September 30, 2016 December 31, 2015 September 30, 2016 December 31, 2015 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 $425 Prepaid expenses and other current assets $627 Accrued expenses and other current liabilities $674 Accrued expenses and other current liabilities $783
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	The Effect of Derivative Instruments on Financial Performance For the Three Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain (Loss) Recognized in Other Comprehensive (Loss)Income (Effective Portion) Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2016 2015 2016 2015 Foreign currency forward contracts $ 1,023 $ (554 ) Operating expenses $ (641 ) $ (1,794 ) For the Nine Months Ended September 30, (In thousands) Derivatives in Cash Flow Hedging Relationships Amount of Gain Recognized in Other Comprehensive (Loss) Income (Effective Portion) Location of Loss Reclassified Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion) 2016 2015 2016 2015 Foreign currency forward contracts $ 2,049 $ 5,770 Operating expenses $ (1,663 ) $ (11,462 )
Schedule Of Effect Of Derivative Instruments On Financial Performance	For the Three Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Derivative Amount of (Loss) Gain Recognized in Income on Derivative 2016 2015 Foreign currency forward contracts Other expense, net $ (1,693 ) $ 1,238 For the Nine Months Ended September 30, (In thousands) Derivatives Not Designated as Hedging Instruments Location of (Loss) Gain Recognized in Income on Derivative Amount of (Loss) Gain Recognized in Income on Derivative 2016 2015 Foreign currency forward contracts Other expense, net $ (5,658 ) $ 1,727
Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding	As of September 30, 2016 , the Company had the following net notional foreign currency forward contracts outstanding (in thousands): Foreign Currency Currency Denomination Australian Dollar AUD 14,700 Brazilian Real BRL 7,800 Pounds Sterling GBP 2,567 Canadian Dollar CAD 1,450 Chinese Yuan Renminbi CNY 33,800 Danish Krone DKK 20,276 Euro EUR 23,832 Hong Kong Dollar HKD 32,500 Indian Rupee INR 320,873 Japanese Yen JPY 1,321,457 Singapore Dollar SGD 10,097 Swiss Franc CHF 32,000

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2016
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, 2015 $ (16,346 ) $ (2,900 ) $ (2,255 ) $ (7,026 ) $ (28,527 ) Other comprehensive income before reclassifications — 4,863 386 — 5,249 Amounts reclassified from accumulated other comprehensive loss — (1,220 ) 1,663 — 443 Net current period other comprehensive income — 3,643 2,049 — 5,692 Balance at September 30, 2016 $ (16,346 ) $ 743 $ (206 ) $ (7,026 ) $ (22,835 )
Schedule of reclassification out of accumulated other comprehensive income	Reclassifications out of Accumulated other comprehensive loss are as follows: For the Three Months Ended September 30, 2016 (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 $ (928 ) Other income (expense), net Unrealized net losses on cash flow hedges 641 Operating expenses * $ (287 ) For the Nine Months Ended September 30, 2016 (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 $ (1,220 ) Other income (expense), net Unrealized net losses on cash flow hedges 1,663 Operating expenses * $ 443 * Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Restructuring (Tables)

Restructuring (Tables)	9 Months Ended
	Sep. 30, 2016
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Charges by Segment	Restructuring charges by segment consists of the following (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015 2014 Restructuring Program Enterprise and Service Provider $ — $ (263 ) $ (177 ) $ 1,747 GoTo Business — — — 50 2015 Restructuring Program Enterprise and Service Provider 7,625 13,714 14,716 59,580 GoTo Business — 315 (79 ) 874 2015 Other Restructuring Program Enterprise and Service Provider 4,551 — 46,772 — GoTo Business (115 ) — 910 — Total restructuring charges $ 12,061 $ 13,766 $ 62,142 $ 62,251
Schedule of Restructuring Accruals	The activity in the Company’s restructuring accruals for the nine months ended September 30, 2016 is summarized as follows (in thousands): 2014 Restructuring Program 2015 Restructuring Program 2015 Other Restructuring Program Total Balance at January 1, 2016 $ 1,121 $ 22,694 $ 16,581 $ 40,396 Employee severance and related costs — 72 43,238 43,310 Consolidation of leased facilities — 14,706 4,442 19,148 Payments (9 ) (7,952 ) (59,646 ) (67,607 ) Reversal of previous charges (177 ) (141 ) — (318 ) Other — — 1,158 1,158 Balance at September 30, 2016 $ 935 $ 29,379 $ 5,773 $ 36,087

Basis Of Presentation (Details)

Basis Of Presentation (Details)	9 Months Ended
	Sep. 30, 2016segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Reportable Segments	2

Significant Accounting Polici38

Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Allowance for estimated product returns	$ 1.2	$ 1.4
Weighted Average [Member] | Online Service Agreements [Member]
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Revenue recognition, period for recognition	12 months
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

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 131,901	$ 55,925	$ 336,262	$ 188,087
Denominator:
Denominator for basic earnings per share - weighted-average shares outstanding (shares)	155,525	160,359	154,847	160,359
Effect of dilutive employee stock awards (shares)	2,007	1,418	1,850	1,357
Denominator for diluted earnings per share - weighted-average shares outstanding (shares)	157,532	161,777	156,697	161,716
Basic earnings per share (in dollars per share)	$ 0.85	$ 0.35	$ 2.17	$ 1.17
Diluted earnings per share (in dollars per share)	$ 0.84	$ 0.35	$ 2.15	$ 1.16
Anti-dilutive weighted-average shares from stock awards (shares)	60	1,572	460	2,416
Senior Notes Due 2019 [Member]
Denominator:
Convertible debt, conversion price (in dollars per share)	$ 90		$ 90

Acquisitions and Divestitures (

Acquisitions and Divestitures (Narrative) (Details) - USD ($)	Sep. 07, 2016	Feb. 29, 2016	Jan. 08, 2016	May 18, 2015	Jan. 08, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Revenue period for earnout provision		5 years
Earnout income recognized								$ 0
Goodwill						$ 1,965,024,000		1,965,024,000		$ 1,962,722,000
Norskale [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration	$ 11,500,000
Cash acquired in business combination	800,000
Transaction costs	400,000
Goodwill	2,900,000
2016 Asset Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired			$ 23,600,000
Sanbolic, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration					$ 89,400,000
Cash acquired in business combination					200,000
Transaction costs					$ 500,000
Conversion of assumed non-vested stock units to shares of Company stock (shares)					37,057
Grasshopper Group, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Preliminary consideration				$ 161,500,000
Cash acquired in business combination				$ 3,600,000
Conversion of assumed non-vested stock units to shares of Company stock (shares)				105,765
General and Administrative Expense [Member] | Norskale [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition related costs						$ 300,000		$ 400,000
General and Administrative Expense [Member] | Sanbolic, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition related costs							$ 0		$ 200,000
General and Administrative Expense [Member] | Grasshopper Group, LLC [Member]
Finite-Lived Intangible Assets [Line Items]
Acquisition related costs							$ 0		$ 300,000
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

Investments (Narrative) (Detail

Investments (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Investment [Line Items]
Average remaining maturities for short-term available for sale investments			8 months
Average remaining maturities for long-term available for sale investments			3 years
Proceeds from available-for-sale of investments	$ 709,200,000	$ 718,400,000	$ 1,160,000,000	$ 1,550,000,000
Gross unrealized losses on available-for-sale investments	661,000		661,000		$ 3,493,000
Other Assets [Member]
Investment [Line Items]
Cost method investments	19,700,000		19,700,000		$ 19,900,000
Other Income (Expense) [Member]
Investment [Line Items]
Realized gains on the sales of available-for-sale investments	1,000,000	300,000	1,600,000	700,000
Realized losses on the sales of available-for-sale investments	100,000	600,000	300,000	900,000
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Investment [Line Items]
Cost-method investments, aggregate carrying amount, evaluated for impairment during the period	1,000,000		1,200,000
Cost method investments, fair value after impairment	100,000		100,000
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Income (Expense) [Member]
Investment [Line Items]
Impairment of intangible assets	$ 900,000	0	$ 1,100,000
Cost method investment, impairment charge included other income		$ 0		$ 3,000,000

Investments (Schedule of Availa

Investments (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investment [Line Items]
Amortized Cost	$ 1,142,341	$ 1,397,439
Gross Unrealized Gains	1,686	870
Gross Unrealized Losses	(661)	(3,493)
Fair Value	1,143,366	1,394,816
Agency securities [Member]
Investment [Line Items]
Amortized Cost	376,248	530,981
Gross Unrealized Gains	727	757
Gross Unrealized Losses	(206)	(1,216)
Fair Value	376,769	530,522
Corporate securities [Member]
Investment [Line Items]
Amortized Cost	606,851	699,210
Gross Unrealized Gains	855	90
Gross Unrealized Losses	(357)	(1,929)
Fair Value	607,349	697,371
Municipal securities [Member]
Investment [Line Items]
Amortized Cost	9,990	14,872
Gross Unrealized Gains	15	14
Gross Unrealized Losses	0	(8)
Fair Value	10,005	14,878
Government securities [Member]
Investment [Line Items]
Amortized Cost	149,252	152,376
Gross Unrealized Gains	89	9
Gross Unrealized Losses	(98)	(340)
Fair Value	$ 149,243	$ 152,045

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	$ 1,295,662	$ 364,930
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	1,157,141	1,397,905
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	2,364	3,678
Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	1,148	1,562
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	0	0
Cash and Cash Equivalents [Member] | Cash [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	498,627	261,962
Cash and Cash Equivalents [Member] | Cash [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Cash [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	797,035	102,968
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Money Market Funds [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Corporate Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Cash and Cash Equivalents [Member] | Corporate Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	13,021	3,588
Cash and Cash Equivalents [Member] | Corporate Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	0	0
Available-for-sale Securities [Member] | Corporate Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Corporate Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	606,201	695,809
Available-for-sale Securities [Member] | Corporate Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	1,148	1,562
Available-for-sale Securities [Member] | Agency Securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Agency Securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	376,769	530,522
Available-for-sale Securities [Member] | Agency Securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Municipal securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Municipal securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	10,005	14,878
Available-for-sale Securities [Member] | Municipal securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Government securities [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Government securities [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	149,243	152,045
Available-for-sale Securities [Member] | Government securities [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	0	0
Accrued Expenses and Other Current Liabilities [Member] | Level 1 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	0	0
Accrued Expenses and Other Current Liabilities [Member] | Level 2 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	2,364	3,678
Accrued Expenses and Other Current Liabilities [Member] | Level 3 [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	0	0
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	0	0
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	1,902	1,063
Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	0	0
Estimate of Fair Value Measurement [Member]
Assets, Fair Value Disclosure [Abstract]
Total assets	2,453,951	1,764,397
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities	2,364	3,678
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Cash [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	498,627	261,962
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	797,035	102,968
Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents [Member] | Corporate Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Cash and cash equivalents	13,021	3,588
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Corporate Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	607,349	697,371
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Agency Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	376,769	530,522
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Municipal securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	10,005	14,878
Estimate of Fair Value Measurement [Member] | Available-for-sale Securities [Member] | Government securities [Member]
Assets, Fair Value Disclosure [Abstract]
Available-for-sale securities	149,243	152,045
Estimate of Fair Value Measurement [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	2,364	3,678
Estimate of Fair Value Measurement [Member] | Foreign Exchange Contract [Member] | Prepaid Expenses and Other Current Assets [Member]
Assets, Fair Value Disclosure [Abstract]
Prepaid expenses and other current assets	$ 1,902	$ 1,063

Fair Value Measurements (Asse44

Fair Value Measurements (Assets and Liabilities on a Nonrecurring Basis) (Details) - Nonrecurring [Member] - Level 3 [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
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	$ 1,000,000		$ 1,200,000
Cost method investments, fair value after impairment	100,000		100,000
Other Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets	$ 900,000	$ 0	$ 1,100,000
Cost method investment, impairment charge included other income		$ 0		$ 3,000,000

Fair Value Measurements (Additi

Fair Value Measurements (Additional Information Regarding Fair Value Measurements) (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Senior Notes	$ 0	$ 1,311,071,000
Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Closing trading price per $100 as of the last day of trading for the quarter	100
Convertible Senior Notes	1,583,550,000
Senior Notes Due 2019 [Member] | Level 2 [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Senior Notes	$ 1,338,782,000

Stock-Based Compensation (Narra

Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Mar. 31, 2016$ / sharesshares	Jan. 31, 2016$ / sharesshares	Mar. 31, 2015$ / sharesshares	Sep. 30, 2016USD ($)planshares	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)installmentplanshares	Sep. 30, 2015USD ($)
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 | $				$ 48,282	$ 38,671	$ 136,202	$ 103,674
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
Market 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)			393,464
Performance period for grants			3 years
Period to determine actual stock grant following end of performance period			60 days
Maximum percentage of market and service condition stock units that will ultimately vest			200.00%
Percentage that Company's return exceeds indexed return			40.00%
Percentage that Company's return underperforms index			20.00%
Percent of award issued if return is negative but index is met			75.00%
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares represented by each non-vested stock unit upon vesting			1
Expected life (in years)	3 years	3 years	2 years 9 months 3 days
The estimated fair value of each award (in dollars per share) | $ / shares	$ 66.18	$ 49.68	$ 61.01
Share based awards granted and outstanding				4,904,470		4,904,470
Total unrecognized compensation cost related to stock-based compensation | $				$ 243,300		$ 243,300
Total unrecognized compensation cost recognition period						1 year 11 months 25 days
Minimum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility factor	29.00%	29.00%	14.00%
Maximum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility factor	39.00%	37.00%	29.00%
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] | Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period for grants							1 year
Period to determine actual stock grant following end of performance period							60 days
Maximum percentage of market and service condition stock units that will ultimately vest							100.00%
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				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				825,513		825,513
Expected life (in years)				6 months	6 months	6 months	6 months
Expected volatility factor					35.00%		35.00%
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%
Expected volatility factor				27.00%		27.00%
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%
Expected volatility factor				41.00%		41.00%
2005 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, total shares issued under plan				3,872,661		3,872,661
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $				$ 2,600	$ 2,300	$ 7,800	$ 5,200
Common Stock [Member] | 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan				29,000,000		29,000,000
Shares reserved for issuance under the stock-based compensation plans				21,286,552		21,286,552
Shares available for grant under the 2014 Plan				16,230,548		16,230,548
Executive Officers [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost | $				$ 2,800		$ 8,200
Non-vested stock unit awards granted to senior level employees (shares)						118,588
Total unrecognized compensation cost recognition period						2 years 10 days
Total unrecognized compensation cost | $				$ 6,700		$ 6,700
Executive Officers [Member] | Minimum [Member] | Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						1 year
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 (Detai

Stock-Based Compensation (Detail Of The Total Stock-Based Compensation Recognized By Income Statement Classification) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 48,282	$ 38,671	$ 136,202	$ 103,674
Cost of Services and Maintenance Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	911	803	2,561	2,095
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	13,256	9,118	35,878	31,454
Sales, Marketing and Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	14,848	16,922	41,442	38,083
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 19,267	$ 11,828	$ 56,321	$ 32,042

Stock-Based Compensation (Assum

Stock-Based Compensation (Assumptions Used To Value Option Grants, Stock Awards and ESPP Shares(Details)	1 Months Ended			3 Months Ended		9 Months Ended
	Mar. 31, 2016	Jan. 31, 2016	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk free interest rate	0.91%	1.10%	0.85%
Expected dividend yield	0.00%	0.00%	0.00%
Expected life (in years)	3 years	3 years	2 years 9 months 3 days
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	29.00%	29.00%	14.00%
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	39.00%	37.00%	29.00%
2015 ESPP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor					35.00%		35.00%
Risk free interest rate					0.25%		0.25%
Expected dividend yield				0.00%	0.00%	0.00%	0.00%
Expected life (in years)				6 months	6 months	6 months	6 months
2015 ESPP Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor				27.00%		27.00%
Risk free interest rate				0.35%		0.25%
2015 ESPP Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility factor				41.00%		41.00%
Risk free interest rate				0.42%		0.42%

Goodwill And Other Intangible49

Goodwill And Other Intangible Assets (Schedule Of Change In Goodwill) (Details) $ in Thousands		3 Months Ended	9 Months Ended
		Mar. 31, 2016USD ($)reporting_unit	Sep. 30, 2016USD ($)	Jan. 01, 2016USD ($)
Statement [Line Items]
Number of reporting units | reporting_unit		3
Reallocation of goodwill resulting from realignment within reportable segments				$ 86,500
Goodwill [Roll Forward]
Balance at January 1, 2016		$ 1,962,722	$ 1,962,722
Additions			2,927
Other			(625)
Balance at September 30, 2016			1,965,024
Enterprise and Service Provider [Member]
Goodwill [Roll Forward]
Balance at January 1, 2016	[1]	1,581,805	1,581,805
Additions	[2]		2,927
Other	[3]		(625)
Balance at September 30, 2016			1,584,107
GoTo Business Division [Member]
Goodwill [Roll Forward]
Balance at January 1, 2016	[1]	$ 380,917	380,917
Additions			0
Other			0
Balance at September 30, 2016			$ 380,917
[1]	Beginning balance as of January 1, 2016 adjusted to reflect the Company’s re-alignment of its reporting unit structure. The change resulted in a goodwill reallocation of $86.5 million from the GoTo Business segment into the Enterprise and Service Provider segment.
[2]	Amount relates to preliminary purchase price allocation of goodwill associated with the 2016 business combination. See Note 4 for more information regarding the Company's acquisitions.
[3]	Amount relates to goodwill associated with the sale of the Company’s CloudPlatform and CloudPortal Business Manager products and to adjustments to the preliminary purchase price allocation associated with 2015 acquisitions. See Note 4 for more information regarding the Company's acquisitions and divestitures.

Goodwill And Other Intangible50

Goodwill And Other Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Intangible Assets [Abstract]
Gross carrying amount	$ 1,051,620		$ 1,051,620		$ 1,037,663
Accumulated amortization	804,228		804,228		754,245
Intangible assets, fair value	247,392		247,392
Product Related Intangible Assets [Member]
Intangible Assets [Abstract]
Gross carrying amount	602,060		602,060		589,847
Accumulated amortization	499,231		499,231		476,141
Other [Member]
Intangible Assets [Abstract]
Gross carrying amount	449,560		449,560		447,816
Accumulated amortization	304,997		$ 304,997		$ 278,104
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	15,000	$ 19,100	$ 45,700	$ 56,200
Operating Expense [Member] | Other [Member]
Intangible Assets [Abstract]
Amortization expense	$ 7,400	12,500	$ 22,100	33,000
Enterprise and Service Provider Division [Member] | ByteMobile [Member]
Intangible Assets [Abstract]
Impairment of intangible assets				65,400
Enterprise and Service Provider Division [Member] | ByteMobile [Member] | Amortization and Impairment of Other Intangible Assets [Member]
Intangible Assets [Abstract]
Impairment of intangible assets				64,400
Enterprise and Service Provider Division [Member] | ByteMobile [Member] | Amortization of Product Related Intangibles [Member]
Intangible Assets [Abstract]
Impairment of intangible assets				1,000
Estimate of Fair Value Measurement [Member] | Enterprise and Service Provider Division [Member] | ByteMobile [Member]
Intangible Assets [Abstract]
Intangible assets, fair value		$ 27,600		$ 27,600

Goodwill And Other Intangible51

Goodwill And Other Intangible Assets (Schedule Of Estimated Future Amortization Expense) (Details) $ in Thousands	Sep. 30, 2016USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2016 (remaining nine months)	$ 20,558
2,017	69,636
2,018	62,135
2,019	39,594
2,020	20,943
Thereafter	34,526
Total	$ 247,392

Segment Information (Net Revenu

Segment Information (Net Revenues And Profit By Segment) (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)segment	Sep. 30, 2015USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment				2
Net revenues		$ 841,251	$ 813,270	$ 2,509,909	$ 2,370,831
Segment profit		153,827	63,798	417,868	237,679
Stock-based compensation		(48,282)	(38,671)	(136,202)	(103,674)
Restructuring		(12,061)	(13,766)	(62,142)	(62,251)
Separation costs		(17,580)	0	(46,190)	0
Consolidated income before income taxes		147,260	53,358	395,590	199,682
Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		668,736	649,185	2,001,496	1,906,223
Segment profit		209,991	175,488	621,930	454,088
Operating Segments [Member] | GoTo Business Division [Member]
Segment Reporting Information [Line Items]
Net revenues		172,515	164,085	508,413	464,608
Segment profit		45,233	37,785	109,412	103,465
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Amortization and impairment of intangible assets	[1]	(23,474)	(97,038)	(68,939)	(154,931)
Stock-based compensation	[1]	(48,282)	(38,671)	(136,202)	(103,674)
Restructuring	[1]	(12,061)	(13,766)	(62,142)	(62,251)
Separation costs	[1]	(17,580)	0	(46,190)	0
Other	[1]	0	0	0	982
Net interest and other expense, net	[1]	$ (6,567)	$ (10,440)	$ (22,279)	$ (37,997)
[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Segment Information (Revenues B

Segment Information (Revenues By Product Grouping) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net revenues		$ 841,251	$ 813,270	$ 2,509,909	$ 2,370,831
Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		668,736	649,185	2,001,496	1,906,223
Operating Segments [Member] | GoTo Business Division [Member]
Segment Reporting Information [Line Items]
Net revenues		172,515	164,085	508,413	464,608
Operating Segments [Member] | Workspace Services revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[1]	414,394	394,523	1,227,172	1,188,186
Operating Segments [Member] | Delivery Networking revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[2]	191,243	189,746	581,612	527,987
Operating Segments [Member] | Cloud Services revenues [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[3]	33,185	26,448	95,229	73,142
Operating Segments [Member] | Professional Services [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues	[4]	29,851	36,675	97,310	110,575
Other Income [Member] | Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Segment Reporting Information [Line Items]
Net revenues		$ 63	$ 1,793	$ 173	$ 6,333
[1]	Workspace Services revenues are primarily comprised of sales from the Company’s windows app delivery products, which include XenDesktop and XenApp, and the Company's mobile app delivery products, which include XenMobile and related license updates and maintenance and support.
[2]	Delivery Networking revenues primarily include NetScaler, ByteMobile Smart Capacity and CloudBridge products and related license updates and maintenance and support.
[3]	Cloud Services revenues primarily include ShareFile, Podio and Citrix Cloud products.
[4]	Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.

Segment Information (Revenues54

Segment Information (Revenues By Geographic Location) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 841,251	$ 813,270	$ 2,509,909	$ 2,370,831
Operating Segments [Member] | Enterprise and Service Provider Division [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	668,736	649,185	2,001,496	1,906,223
Operating Segments [Member] | Enterprise and Service Provider Division [Member] | Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	397,349	369,574	1,188,719	1,072,092
Operating Segments [Member] | Enterprise and Service Provider Division [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	199,837	208,224	611,832	621,582
Operating Segments [Member] | Enterprise and Service Provider Division [Member] | Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	71,550	71,387	200,945	212,549
Operating Segments [Member] | GoTo Business Division [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	172,515	164,085	508,413	464,608
Operating Segments [Member] | GoTo Business Division [Member] | Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	144,682	135,922	428,760	386,547
Operating Segments [Member] | GoTo Business Division [Member] | EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	22,356	22,632	64,888	62,819
Operating Segments [Member] | GoTo Business Division [Member] | Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 5,477	$ 5,531	$ 14,765	$ 15,242

Convertible Senior Notes (Narra

Convertible Senior Notes (Narrative) (Details) - USD ($)	Apr. 30, 2014	Jun. 30, 2014	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2015
Debt Instrument [Line Items]
Amount used to repurchase stock			$ 28,689,000	$ 398,070,000
Convertible notes			1,338,782,000			$ 0
Temporary equity			87,841,000			0
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			$ 1,338,782,000		$ 1,440,000,000	1,311,071,000
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			0.0111111
Debt instrument, face amount			$ 1,000
Convertible debt, conversion price (in dollars per share)			$ 90
Repurchase price as a percent of principal amount			100.00%
Amortization of debt discount, effective interest method, percent			3.00%
Convertible notes			$ 1,340,000,000
Deferred tax liability, equity component			8,200,000
Temporary equity			$ 87,841,000			$ 0
Shares of common stock covered by note hedges (shares)	16,000,000
Warrant transaction (shares)	16,000,000
Initial strike price of warrants (in dollars per share)	$ 120
Warrants exercised (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	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Temporary equity	$ 87,841	$ 0
Additional paid-in capital	4,687,343	4,566,919
Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Principal	1,437,500	1,437,500
Less: note discount and issuance costs	(98,718)	(126,429)
Net carrying amount	1,338,782	1,311,071	$ 1,440,000
Temporary equity	87,841	0
Additional paid-in capital	75,028	162,869
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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Contractual interest expense	$ 1,797	$ 1,797	$ 5,391	$ 5,391
Amortization of debt issuance costs	1,021	997	3,045	2,971
Amortization of debt discount	8,284	8,039	24,667	23,939
Debt Instrument, Interest Expense, Total	$ 11,102	$ 10,833	$ 33,103	$ 32,301

Credit Facility (Details)

Credit Facility (Details) - Line of Credit [Member]	Jan. 07, 2015USD ($)	Sep. 30, 2015	Sep. 30, 2016USD ($)
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 (percent)		1.82%
Amount outstanding			$ 0
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 Instrume59

Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
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	$ (0.2)	$ (2.3)

Derivative Financial Instrume60

Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Instruments) (Details) - Cash Flow Hedging [Member] - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives
Asset derivatives	$ 1,476	$ 436
Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liability Derivatives
Liability derivatives	1,690	2,895
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Asset Derivatives
Asset derivatives	425	627
Not Designated as Hedging Instrument [Member] | Accrued Expenses and Other Current Liabilities [Member]
Liability Derivatives
Liability derivatives	$ 674	$ 783

Derivative Financial Instrume61

Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Not Designated as Hedging Instrument [Member] | Other Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Income on Derivative	$ (1,693)	$ 1,238	$ (5,658)	$ 1,727
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Other Comprehensive (Loss)Income (Effective Portion)	1,023	(554)	2,049	5,770
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Operating Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss (Effective Portion)	$ (641)	$ (1,794)	$ (1,663)	$ (11,462)

Derivative Financial Instrume62

Derivative Financial Instruments (Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding) (Details) - Sep. 30, 2016 € 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

INR (₨)

DKK

GBP (£)

JPY (¥)

CHF (SFr)

AUD

HKD

BRL

EUR (€)

SGD

CAD

CNY (¥)

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Net notional foreign currency forward contracts outstanding

₨ 320,873

DKK 20,276

£ 2,567

¥ 1,321,457

SFr 32,000

AUD 14,700

HKD 32,500

BRL 7,800

€ 23,832

SGD 10,097

CAD 1,450

¥ 33,800

Comprehensive Income (Changes i

Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			$ (28,527)
Other comprehensive income before reclassifications			5,249
Amounts reclassified from accumulated other comprehensive loss			443
Other comprehensive (loss) income	$ (934)	$ (228)	5,692	$ 7,326
Balance at September 30, 2016	(22,835)		(22,835)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(16,346)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive (loss) income			0
Balance at September 30, 2016	(16,346)		(16,346)
Unrealized Gain (Loss) on Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(2,900)
Other comprehensive income before reclassifications			4,863
Amounts reclassified from accumulated other comprehensive loss			(1,220)
Other comprehensive (loss) income			3,643
Balance at September 30, 2016	743		743
Unrealized (Loss) Gain on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(2,255)
Other comprehensive income before reclassifications			386
Amounts reclassified from accumulated other comprehensive loss			1,663
Other comprehensive (loss) income			2,049
Balance at September 30, 2016	(206)		(206)
Other Comprehensive Loss on Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at December 31, 2015			(7,026)
Other comprehensive income before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Other comprehensive (loss) income			0
Balance at September 30, 2016	$ (7,026)		$ (7,026)

Comprehensive Income (Reclassif

Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Unrealized net gains on available-for-sale securities		$ (494)	$ 2,369	$ 781	$ 13,480
Unrealized net losses on cash flow hedges		549,449	603,218	1,670,652	1,721,541
Net income		(131,901)	$ (55,925)	(336,262)	$ (188,087)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income		(287)		443
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		(928)		(1,220)
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]	$ 641		$ 1,663
[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		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net unrecognized tax benefit	$ 65.8		$ 65.8		$ 54.6
Income tax interest and penalties accrued	2.2		2.2
Deferred tax assets	$ 229.5		$ 229.5
Effective tax rate	10.40%	(4.80%)	15.00%	5.80%
U.S. federal statutory rate			35.00%

Treasury Stock (Details)

Treasury Stock (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 6,300,000,000		$ 6,300,000,000
Available to repurchase common stock	404,000,000		404,000,000
Amount expended on share repurchases in open market transactions	0	$ 279,500,000	$ 28,700,000	$ 451,600,000
Number of shares repurchased		3,895,283	426,300	6,588,783
Average per share price on share repurchases in open market transactions (in dollars per share)		$ 71.75	$ 67.30	$ 68.54
Shares repurchased, not yet settled	$ 53,600,000		$ 53,600,000
Number of shares withheld to satisfy minimum tax withholding obligations	134,782	55,963	698,391	501,785
Payment for tax withholding related to vested stock units	$ 12,000,000	$ 4,100,000	$ 55,000,000	$ 32,400,000
Amount Authorized in January 2016 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 400,000,000		$ 400,000,000

Restructuring (Narrative) (Deta

Restructuring (Narrative) (Details) $ in Thousands	Nov. 17, 2015position	Dec. 31, 2015position	Sep. 30, 2016USD ($)	Mar. 31, 2016position	Sep. 30, 2015USD ($)	Jun. 30, 2015position	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring			$ 12,061		$ 13,766		$ 62,142	$ 62,251
2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position	700	350		350
Restructuring			4,400				47,700
Restructuring costs incurred since inception			77,400				77,400
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Number of full-time positions eliminated | position						700
Restructuring			7,600				14,600
Restructuring costs incurred since inception			$ 83,500				$ 83,500

Restructuring (Restructuring Ch

Restructuring (Restructuring Charges by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 12,061	$ 13,766	$ 62,142	$ 62,251
2014 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	0	(263)	(177)	1,747
2014 Restructuring Program [Member] | GoTo Business Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	0	0	0	50
2015 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	7,600		14,600
2015 Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	7,625	13,714	14,716	59,580
2015 Restructuring Program [Member] | GoTo Business Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	0	315	(79)	874
2015 Other Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	4,400		47,700
2015 Other Restructuring Program [Member] | Enterprise and Service Provider Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	4,551	0	46,772	0
2015 Other Restructuring Program [Member] | GoTo Business Division [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ (115)	$ 0	$ 910	$ 0

Restructuring (Activity in Rest

Restructuring (Activity in Restructuring Accruals) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			$ 40,396
Employee severance and related costs	$ 12,061	$ 13,766	62,142	$ 62,251
Payments			(67,607)
Reversal of previous charges			(318)
Balance at September 30, 2016	36,087		36,087
Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			43,310
Other Restructuring Costs			1,158
Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			19,148
2014 Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			1,121
Payments			(9)
Reversal of previous charges			(177)
Balance at September 30, 2016	935		935
2014 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			0
Other Restructuring Costs			0
2014 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			0
2015 Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			22,694
Employee severance and related costs	7,600		14,600
Payments			(7,952)
Reversal of previous charges			(141)
Balance at September 30, 2016	29,379		29,379
2015 Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			72
Other Restructuring Costs			0
2015 Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			14,706
2015 Other Restructuring Program [Member]
Restructuring Reserve [Roll Forward]
Balance at January 1, 2016			16,581
Employee severance and related costs	4,400		47,700
Payments			(59,646)
Reversal of previous charges			0
Balance at September 30, 2016	$ 5,773		5,773
2015 Other Restructuring Program [Member] | Employee Severance and Related Costs [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			43,238
Other Restructuring Costs			1,158
2015 Other Restructuring Program [Member] | Consolidation of Leased Facilities [Member]
Restructuring Reserve [Roll Forward]
Employee severance and related costs			$ 4,442

Proposed Separation of GoTo B70

Proposed Separation of GoTo Business (Details) - USD ($) $ in Thousands, shares in Millions	Jul. 26, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Separation costs		$ 17,580	$ 0	$ 46,190	$ 0
Separation Costs, Spinoff Transaction Cost Incurred		52,500		52,500
Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Expected separation costs		120,000		120,000
Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Expected separation costs		$ 130,000		$ 130,000
GetGo, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
LogMeIn common stock received in merger (shares)	26.9

Recent Accounting Pronounceme71

Recent Accounting Pronouncements (Details) - Accounting Standards Update 2015-03 [Member] $ in Millions	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Long-term Debt	$ (13.9)
Deferred financing costs	$ (13.9)