Citrix Systems (CTXS) 10-K 20 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 14, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'ctxs	'	'
Entity Registrant Name	'CITRIX SYSTEMS INC	'	'
Entity Central Index Key	'0000877890	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	183,753,307	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$11,044,768,169

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$280,740	$643,609
Short-term investments, available-for-sale	453,976	285,022
Accounts receivable, net of allowances of $5,354 and $6,448 at December 31, 2013 and 2012, respectively	654,821	630,956
Inventories, net	14,107	10,723
Prepaid expenses and other current assets	110,981	106,579
Current portion of deferred tax assets, net	48,470	36,846
Total current assets	1,563,095	1,713,735
Long-term investments, available-for-sale	855,700	595,313
Property and equipment, net	338,996	303,294
Goodwill	1,768,949	1,518,219
Other intangible assets, net	509,595	556,205
Long-term portion of deferred tax assets, net	115,418	43,097
Other assets	60,496	66,539
Total assets	5,212,249	4,796,402
Current liabilities:	'	'
Accounts payable	78,452	71,116
Accrued expenses and other current liabilities	257,606	257,135
Income taxes payable	29,322	49,346
Current portion of deferred revenues	1,098,681	965,276
Total current liabilities	1,464,061	1,342,873
Long-term portion of deferred revenues	313,059	232,719
Other liabilities	115,322	99,033
Commitments and contingencies	'	'
Stockholders' equity:	'	'
Preferred stock at $.01 par value: 5,000 shares authorized, none issued and outstanding	0	0
Common stock at $.001 par value: 1,000,000 shares authorized; 291,078 and 287,123 shares issued and outstanding at December 31, 2013 and 2012, respectively	291	287
Additional paid-in capital	3,974,297	3,691,111
Retained earnings	2,903,541	2,564,018
Accumulated other comprehensive income (loss)	4,951	-7,705
Stockholders' equity before treasury stock	6,883,080	6,247,711
Less - common stock in treasury, at cost (107,789 and 100,781 shares at December 31, 2013 and 2012, respectively)	-3,563,273	-3,125,934
Total stockholders' equity	3,319,807	3,121,777
Total liabilities and stockholders' equity	$5,212,249	$4,796,402

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Accounts receivable, allowances	$5,354	$6,448
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	291,078,000	287,123,000
Common stock, shares outstanding	291,078,000	287,123,000
Treasury Stock, Shares	107,789,000	100,781,000

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues:	'		'		'
Product and licenses	$891,630		$830,645		$744,513
Software as a service	582,872		511,323		430,213
License updates and maintenance	1,305,053		1,125,094		940,181
Professional services	138,879		119,061		91,485
Total net revenues	2,918,434		2,586,123		2,206,392
Cost of net revenues:	'		'		'
Cost of product and license revenues	114,932		96,962		74,393
Cost of services and maintenance revenues	289,990		227,150		164,465
Amortization of product related intangible assets	97,873		80,025		54,741
Total cost of net revenues	502,795		404,137		293,599
Gross margin	2,415,639		2,181,986		1,912,793
Operating expenses:	'		'		'
Research and development	516,338		450,571		380,674
Sales, marketing and services	1,216,680		1,060,829		885,066
General and administrative	260,236		245,259		213,673
Amortization of other intangible assets	41,668		34,549		16,390
Restructuring	0	[1]	0	[1]	24	[1]
Total operating expenses	2,034,922		1,791,208		1,495,827
Income from operations	380,717		390,778		416,966
Interest income	8,194		10,152		13,819
Other (expense) income, net	-1,021		9,299		-288
Income before income taxes	387,890		410,229		430,497
Income taxes	48,367		57,682		74,867
Consolidated net income	339,523		352,547		355,630
Less: Net loss attributable to non-controlling interest	0		0		692
Net income attributable to Citrix Systems, Inc.	$339,523		$352,547		$356,322
Net income per share attributable to Citrix Systems, Inc. stockholders:	'		'		'
Net income per share attributable to Citrix Systems, Inc. stockholders - basic (in dollars per share)	$1.82		$1.89		$1.90
Net income per share attributable to Citrix Systems, Inc. stockholders - diluted (in dollars per share)	$1.80		$1.86		$1.87
Weighted average shares outstanding:	'		'		'
Basic (in shares)	186,672		186,722		187,315
Diluted (in shares)	188,245		189,129		190,641
[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Consolidated_Statement_of_Comp

Consolidated Statement of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Consolidated net income	$339,523	$352,547	$355,630
Other comprehensive income (loss):	'	'	'
Change in foreign currency translation adjustment	8,482	2,457	-4,595
Available for sale securities:	'	'	'
Change in net unrealized gains	-985	3,603	293
Less: reclassification adjustment for net (gains) losses included in net income	-203	-3,443	1,343
Net change (net of tax effect)	-1,188	160	1,636
Gain (loss) on pension liability	2,500	-3,925	634
Cash flow hedges:	'	'	'
Change in unrealized gains	-67	-653	-2,784
Less: reclassification adjustment for net losses (gains) included in net income	2,929	5,817	-8,475
Net change (net of tax effect)	2,862	5,164	-11,259
Other comprehensive income (loss)	12,656	3,856	-13,584
Comprehensive income	352,179	356,403	342,046
Less: Comprehensive income attributable to non-controlling interest	0	0	-692
Comprehensive income attributable to Citrix Systems, Inc.	$352,179	$356,403	$341,354

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	Total	Common Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (loss)	Common Stock in Treasury	Non-Controlling Interest
In Thousands, except Share data, unless otherwise specified
Beginning balance at Dec. 31, 2010	$2,560,588	$278	$3,112,186	$1,855,149	$2,023	($2,416,645)	$7,597
Beginning balance (in shares) at Dec. 31, 2010	'	277,992,000	'	'	'	'	'
Treasury Stock, Shares	'	'	'	'	'	96,960,000	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Shares issued under stock-based compensation plans	125,606	4	125,602	0	0	0	0
Shares issued under stock-based compensation plans (in shares)	'	4,472,000	'	'	'	0	'
Stock-based compensation expense	89,422	0	89,422	0	0	0	0
Common stock issued under employee stock purchase plan	21,099	1	21,098	0	0	0	0
Common stock issued under employee stock purchase plan (in shares)	'	310,000	'	'	'	0	'
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	50,003	0	50,003	0	0	0	0
Stock repurchases, net	-424,849	0	0	0	0	-424,849	0
Stock repurchases, net (in shares)	-6,275,470	0	'	'	'	-6,276,000	'
Restricted shares turned in for tax withholding	-13,262	0	0	0	0	-13,262	0
Restricted shares turned in for tax withholding (in shares)	-182,203	0	'	'	'	-182,000	'
Purchase of non-controlling interest	-20,163	0	-13,258	0	0	0	-6,905
Other comprehensive loss, net of tax	-13,584	0	0	0	-13,584	0	0
Net income	355,630	0	0	356,322	0	0	-692
Ending balance at Dec. 31, 2011	2,730,490	283	3,385,053	2,211,471	-11,561	-2,854,756	0
Ending balance (in shares) at Dec. 31, 2011	'	282,774,000	'	'	'	'	'
Treasury Stock, Shares	100,781,000	'	'	'	'	100,781,000	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Shares issued under stock-based compensation plans	108,405	3	108,402	0	0	0	0
Shares issued under stock-based compensation plans (in shares)	'	3,983,000	'	'	'	0	'
Stock-based compensation expense	145,967	0	145,967	0	0	0	0
Common stock issued under employee stock purchase plan	24,889	1	24,888	0	0	0	0
Common stock issued under employee stock purchase plan (in shares)	'	366,000	'	'	'	0	'
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	24,839	0	24,839	0	0	0	0
Stock repurchases, net	-251,008	0	0	0	0	-251,008	0
Stock repurchases, net (in shares)	-3,550,817	0	'	'	'	-3,551,000	'
Restricted shares turned in for tax withholding	-20,170	0	0	0	0	-20,170	0
Restricted shares turned in for tax withholding (in shares)	-269,745	0	'	'	'	-270,000	'
Other	1,962	0	1,962	0	0	0	0
Other comprehensive loss, net of tax	3,856	0	0	0	3,856	0	0
Net income	352,547	0	0	352,547	0	0	0
Ending balance at Dec. 31, 2012	3,121,777	287	3,691,111	2,564,018	-7,705	-3,125,934	0
Ending balance (in shares) at Dec. 31, 2012	'	287,123,000	'	'	'	'	'
Treasury Stock, Shares	107,789,000	'	'	'	'	107,789,000	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'	'
Shares issued under stock-based compensation plans	73,655	3	73,652	0	0	0	0
Shares issued under stock-based compensation plans (in shares)	'	3,545,000	'	'	'	0	'
Stock-based compensation expense	179,098	0	179,098	0	0	0	0
Common stock issued under employee stock purchase plan	30,145	1	30,144	0	0	0	0
Common stock issued under employee stock purchase plan (in shares)	'	410,000	'	'	'	0	'
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	-620	0	-620	0	0	0	0
Stock repurchases, net	-406,326	0	0	0	0	-406,326	0
Stock repurchases, net (in shares)	-6,563,986	0	'	'	'	-6,564,000	'
Restricted shares turned in for tax withholding	-31,013	0	0	0	0	-31,013	0
Restricted shares turned in for tax withholding (in shares)	-444,657	0	'	'	'	-444,000	'
Other	912	0	912	0	0	0	0
Other comprehensive loss, net of tax	12,656	0	0	0	12,656	0	0
Net income	339,523	0	0	339,523	0	0	0
Ending balance at Dec. 31, 2013	$3,319,807	$291	$3,974,297	$2,903,541	$4,951	($3,563,273)	$0
Ending balance (in shares) at Dec. 31, 2013	'	291,078,000	'	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Operating Activities	'		'		'
Net income	$339,523		$352,547		$355,630
Adjustments to reconcile net income to net cash provided by operating activities:	'		'		'
Amortization of intangible assets	139,541	[1]	114,574	[1]	71,131	[1]
Depreciation and amortization of property and equipment	127,959		100,299		88,124
Stock-based compensation expense	183,941		149,940		92,909
(Gain) loss on investments	-2,441		-14,477		1,343
Provision for doubtful accounts	1,046		1,784		266
Provision for product returns	4,473		10,743		5,541
Provision for inventory reserves	1,905		1,022		1,570
Deferred income tax benefit	-51,848		-70,791		-16,229
Excess tax benefit from stock-based compensation, net	8,129		24,839		50,003
Tax effect of stock-based compensation	-12,552		-35,374		-51,659
Effects of exchange rate changes on monetary assets and liabilities denominated in foreign currencies	5,888		1,706		1,895
Other non-cash items	434		1,178		4,733
Total adjustments to reconcile net income to net cash provided by operating activities	406,475		285,443		249,627
Changes in operating assets and liabilities, net of the effects of acquisitions:	'		'		'
Accounts receivable	-22,951		-107,628		-95,481
Inventories	-5,591		-2,024		-3,097
Prepaid expenses and other current assets	-862		-9,195		1,407
Other assets	5,076		-1,497		-562
Income taxes, net	-35,316		-4,408		25,180
Accounts payable	3,092		-426		-11,758
Accrued expenses and other current liabilities	22,515		45,135		-20,996
Deferred revenues	201,455		216,798		168,994
Other liabilities	14,927		43,782		10,178
Total changes in operating assets and liabilities, net of the effects of acquisitions	182,345		180,537		73,865
Net cash provided by operating activities	928,343		818,527		679,122
Investing Activities	'		'		'
Purchases of available-for-sale investments	-1,703,976		-1,435,367		-1,360,677
Proceeds from sales of available-for-sale investments	766,192		1,256,295		856,182
Proceeds from maturities of available-for-sale investments	504,314		437,991		652,939
Proceeds from the sales of cost method investments	12,067		24,252		0
Purchases of property and equipment	-162,889		-122,958		-111,932
Purchases of cost method investments	-6,824		-6,622		-16,879
Cash paid for acquisitions, net of cash acquired	-334,881		-487,221		-455,377
Cash paid for licensing agreements and product related intangible assets	-12,153		-27,760		-15,437
Other	0		3,450		0
Net cash used in investing activities	-938,150		-357,940		-451,181
Financing Activities	'		'		'
Proceeds from issuance of common stock under stock-based compensation plans	73,655		108,406		125,606
Repayment of acquired debt	-2,061		-24,346		-11,561
Excess tax benefit from stock-based compensation	12,552		35,374		51,659
Purchase of non-controlling interest	0		0		-17,207
Stock repurchases, net	-406,326		-251,008		-424,849
Cash paid for tax withholding on vested stock awards	-31,013		-20,170		-13,262
Other	912		1,962		-3,000
Net cash used in financing activities	-352,281		-149,782		-292,614
Effect of exchange rate changes on cash and cash equivalents	-781		-492		1,807
Change in cash and cash equivalents	-362,869		310,313		-62,866
Cash and cash equivalents at beginning of period	643,609		333,296		396,162
Cash and cash equivalents at end of period	280,740		643,609		333,296
Supplemental Cash Flow Information	'		'		'
Cash paid for income taxes	92,672		32,355		12,195
Cash paid for interest	$127		$305		$139
[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Organization

Organization	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
ORGANIZATION	'
	ORGANIZATION
	Citrix Systems, Inc. ("Citrix" or the "Company"), is a Delaware corporation founded on April 17, 1989. Citrix is a leader in virtualization, networking and cloud infrastructure to enable new ways for people to work better. Citrix solutions help IT and service providers to build, manage and secure virtual and mobile workspaces that seamlessly deliver apps, desktops, data and services to virtually anyone, on any device, over any network or cloud.
	Citrix markets and licenses its products directly to customers, over the Web, and through systems integrators ("SIs"), in addition to indirectly through value-added resellers ("VARs"), value-added distributors ("VADs"), original equipment manufacturers ("OEMs"), and service providers.
	The Company’s revenues are derived from its Enterprise and Service Provider products, which primarily include its Mobile and Desktop products, Networking and Cloud products and related license updates and maintenance and professional services and from its Software as a Service ("SaaS") products, which primarily include Collaboration and Data Sharing, Remote Access and Remote IT Support products. Enterprise and Service Provider (formerly Infrastructure division) and SaaS constitute the Company's two reportable segments. See Note 11 for more information on the Company's segments.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
SIGNIFICANT ACCOUNTING POLICIES	'
	SIGNIFICANT ACCOUNTING POLICIES
	Consolidation Policy
	The consolidated financial statements of the Company include the accounts of its wholly-owned subsidiaries in the Americas, Europe, the Middle East and Africa (“EMEA”), Asia-Pacific and the SaaS division. All significant transactions and balances between the Company and its subsidiaries have been eliminated in consolidation.
	Cash and Cash Equivalents
	Cash and cash equivalents at December 31, 2013 and 2012 include marketable securities, which are primarily money market funds, commercial paper, agency, and government securities, municipal securities and corporate securities with initial or remaining contractual maturities when purchased of three months or less.
	Investments
	Short-term and long-term investments at December 31, 2013 and 2012 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 income (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.
	Accounts Receivable
	The Company’s accounts receivable are attributable primarily to VARs, VADs and end customers. Collateral is generally not required. The Company also maintains allowances for doubtful accounts for estimated losses resulting from the inability of the Company’s customers to make payments. The Company periodically reviews these estimated allowances, including by conducting an analysis of the customer's payment history and creditworthiness, the age of the trade receivable balances and current economic conditions that may affect a customer’s ability to make payments. Based on this review, the Company specifically reserves for those accounts deemed uncollectible. When receivables are determined to be uncollectible, principal amounts of such receivables outstanding are deducted from the allowance. The allowance for doubtful accounts was $3.3 million and $3.8 million as of December 31, 2013 and 2012, respectively. If the financial condition of a significant distributor or customer were to deteriorate, the Company’s operating results could be adversely affected. One distributor, Ingram Micro, accounted for 10% and 11% of gross accounts receivable at December 31, 2013 and 2012, respectively.
	Inventory
	Inventories are stated at the lower of cost or market on a standard cost basis, which approximates actual cost. The Company’s inventories primarily consist of finished goods as of December 31, 2013 and 2012.
	Property and Equipment
	Property and equipment is stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which is generally three years for computer equipment and software, the lesser of the lease term or ten years for leasehold improvements, which is the estimated useful life, seven years for office equipment and furniture and the Company’s enterprise resource planning system and 40 years for buildings.
	During 2013 and 2012, the Company retired $10.3 million and $5.3 million, respectively, in property and equipment that were no longer in use. At the time of retirement, the remaining net book value of these assets was not material and no material asset retirement obligations were associated with them.
	Property and equipment consist of the following:
			December 31,
			2013				2012
			(In thousands)
	Buildings		$	85,092			$	76,202
	Computer equipment		204,110				178,948
	Software		316,902				259,225
	Equipment and furniture		105,145				86,362
	Leasehold improvements		168,990				149,731
			880,239				750,468
	Less accumulated depreciation and amortization		(597,268		)		(479,460		)
	Assets under construction		28,438				15,517
	Land		27,587				16,769
	Total		$	338,996			$	303,294
	Long-Lived Assets
	The Company reviews for impairment of long-lived assets and certain identifiable intangible assets to be held and used whenever events or changes in circumstances indicate that the carrying amount of such assets may not be fully recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition. Measurement of an impairment loss is based on the fair value of the asset compared to its carrying value. Long-lived assets and certain identifiable intangible assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell.
	For the year ended December 31, 2012, the Company decided to contribute its CloudStack tradename acquired in conjunction with its acquisition of Cloud.com to the Apache Software Foundation. As a result, the carrying value of the CloudStack tradename was written down to zero, resulting in a $5.2 million impairment, which was recorded in Amortization of other intangible assets in the accompanying consolidated statements of income. During 2013 and 2011, the Company did not recognize any impairment charges associated with its 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 tests analyses completed during the fourth quarters of 2013 and 2012, respectively. The authoritative guidance provides entities with an option to perform a qualitative assessment to determine whether further quantitative impairment testing is necessary. The Company performed the qualitative assessment when it performed its goodwill impairment test in the fourth quarter of 2013. As a result of the qualitative analysis, no further quantitative impairment test was deemed necessary. See Note 3 for acquisitions and Note 11 for segment information.
	The following table presents the change in goodwill allocated to the Company’s reportable segments during 2013 and 2012 (in thousands):
		Balance at January 1, 2013				Additions				Other				Balance at December 31, 2013		Balance at January 1, 2012		Additions			Other				Balance at December 31, 2012
	Enterprise and Service Provider division	$	1,158,580			$	248,800			$	(5,224	)	-2	$	1,402,156	$	956,504	$	257,379		$	(55,303	)	-4	$	1,158,580
	SaaS division	359,639				2,668				4,486			-3	366,793		282,616		26,481			50,542			-4	359,639
	Consolidated	$	1,518,219			$	251,468		-1	$	(738	)		$	1,768,949	$	1,239,120	$	283,860	-1	$	(4,761	)		$	1,518,219
	(1)	Amount primarily relates to acquisitions. See Note 3 for more information regarding the Company’s acquisitions.
	(2)	Amount primarily relates to adjustments to the preliminary purchase price allocation for certain 2012 Acquisitions.
	(3)	Amount primarily relates to foreign currency translation.
	(4)	Amount primarily relates to reclassification of goodwill between segments. In the first quarter of 2012, the Company transferred the business acquired in its acquisition of Novell Labs, Inc. (d/b/a "ShareFile") from its Enterprise and Service Provider division to its SaaS division. Also included in the SaaS division is foreign currency translation.
	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 recognized on a straight-line basis 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 accordance with the authoritative guidance, the Company records acquired product related intangible assets at net realizable value and reviews this technology for impairment on a periodic basis by comparing the estimated net realizable value to the unamortized cost of the technology. 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 purchased intangible asset and is amortized over the asset's estimated useful life.
	Intangible assets consist of the following (in thousands):
		December 31, 2013
		Gross Carrying				Accumulated				Weighted-Average Life (Years)
		Amount				Amortization
	Product related intangible assets	$	677,509			$	428,418			5.6
	Other	482,918				222,414				7.52
	Total	$	1,160,427			$	650,832			6.38
		December 31, 2012
		Gross Carrying				Accumulated				Weighted-Average Life (Years)
		Amount				Amortization
	Product related intangible assets	$	620,032			$	339,608			5.6
	Other	446,601				170,820				7.28
	Total	$	1,066,633			$	510,428			6.29
	Other intangible assets consist primarily of customer relationships, trade names, covenants not to compete and patents. Amortization of product related intangible assets includes amortization of product related technologies and patents and is reported as a Cost of net revenues in the accompanying consolidated statements of income. Amortization of other intangible assets includes amortization of customer relationships, trade names and covenants not to compete and is reported as an Operating expense in the accompanying consolidated statements of income. The Company monitors its intangible assets for indicators of impairment. If the Company determines an impairment has occurred, it will write-down the intangible asset to its fair value. There were no impairments for the year ended December 31, 2013. For the year ended December 31, 2012, Amortization of other intangible assets includes a $5.2 million impairment related to the Company's decision to contribute its CloudStack tradename acquired in conjunction with its acquisition of Cloud.com to the Apache Software Foundation. As a result, the carrying value of the CloudStack tradename was written down to zero. See Note 3 for more information regarding the Company's acquisitions.
	Estimated future annual amortization expense is as follows (in thousands):
	Year ending December 31,
	2014	$	132,956
	2015	111,016
2016	88,749
2017	61,057
2018	47,618
Software Development Costs
The authoritative guidance requires certain internal software development costs related to software to be sold to be capitalized upon the establishment of technological feasibility. The Company's software development costs incurred subsequent to achieving technological feasibility have not been significant and substantially all software development costs have been expensed as incurred.
Internal Use Software
In accordance with the authoritative guidance, the Company capitalizes external direct costs of materials and services and internal costs such as payroll and benefits of those employees directly associated with the development of new functionality in internal use software and software developed related to its software as a service (“SaaS”) offerings. The amount of costs capitalized in 2013 and 2012 relating to internal use software was $62.7 million and $51.5 million, respectively. These costs are being amortized over the estimated useful life of the software, which is generally three to seven years, and are included in property and equipment in the accompanying consolidated balance sheets. The total amounts charged to expense relating to internal use software was approximately $58.6 million, $44.5 million and $37.2 million, during the years ended December 31, 2013, 2012 and 2011, respectively.
Revenue Recognition
Net revenues include the following categories: Product and licenses, Software as a service, 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 appliance products. These revenues are reflected net of sales allowances, cooperative advertising agreements, partner incentive programs and provisions for returns. Shipping charges billed to customers are included in Product and license revenue and the related shipping costs are included in Cost of product and license revenue. 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. The Company licenses many of its virtualization products bundled with a one-year contract for its Subscription Advantage program. 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 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 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 support with product version upgrades. 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 Company defines these four criteria as follows:
•	Persuasive evidence of the arrangement exists. The Company primarily sells its software products via electronic licenses and typically requires a purchase order from the distributor, reseller or end-user (depending on the arrangement) who have previously negotiated a master distribution or resale agreement and an executed product license agreement from the end-user. For appliance sales, it is the Company’s customary practice to require a purchase order from distributors and resellers who have previously negotiated a master packaged product distribution or resale agreement. The Company typically recognizes revenue upon shipment for its appliance sales. For maintenance, technical support, product training and consulting services, the Company requires a purchase order and an executed agreement. For SaaS, the Company generally requires the customer or the reseller to electronically accept the terms of an online services agreement or execute a contract.
•	Delivery has occurred and the Company has no remaining obligations. The Company considers delivery of licenses under electronic licensing agreements to have occurred when the related products are shipped and the end-user has been electronically provided the software activation keys that allow the end-user to take immediate possession of the product. For hardware appliance sales, the Company’s standard delivery method is free-on-board shipping point. Consequently, it considers delivery of appliances to have occurred when they are shipped pursuant to an agreement and purchase order. For SaaS, delivery occurs upon providing the users with their login id and password. For product training and consulting services, the Company fulfills its obligation when the services are performed. For license updates and maintenance, the Company assumes that its obligation is satisfied ratably over the respective terms of the agreements, which are typically 12 to 24 months. For SaaS, the Company assumes that its obligation is satisfied ratably over the respective terms of the agreements, which are typically 12 months.
•	The fee is fixed or determinable. In the normal course of business, the Company does not provide customers the right to a refund of any portion of their license fees or extended payment terms. The fees are considered fixed or determinable upon establishment of an arrangement that contains the final terms of the sale including description, quantity and price of each product or service purchased. For SaaS, the fee is considered fixed or determinable if it is not subject to refund or adjustment.
•	Collectability is probable. The Company determines collectability on a customer-by-customer basis and generally does not require collateral. The Company typically sells product licenses and license updates to distributors or resellers for whom there are histories of successful collection. New customers are typically subject to a credit review process that evaluates their financial position and ultimately their ability to pay. Customers are also subject to an ongoing credit review process. If the Company determines from the outset of an arrangement that collectability is not probable, revenue recognition is deferred until customer payment is received and the other parameters of revenue recognition described above have been achieved. Management’s judgment is required in assessing the probability of collection, which is generally based on an evaluation of customer specific information, historical experience and economic market conditions.
The majority of the Company’s product and license revenue consists of revenue from the sale of stand-alone software products. Stand-alone 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.
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 SaaS products are considered service arrangements per the authoritative guidance; accordingly, the Company follows the provisions of Securities and Exchange Commission Staff Accounting Bulletin (“SAB”) No. 104, Revenue Recognition, when accounting for these service arrangements. Generally, the Company’s SaaS products are sold separately and not bundled with the Enterprise and Service Provider division’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 consolidated financial statements and have historically been within management’s expectations. Allowances for estimated product returns amounted to approximately $2.1 million and $2.6 million at December 31, 2013 and December 31, 2012, 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.
Product Concentration
The Company derives a substantial portion of its revenues from its Mobile and Desktop products, which include its XenDesktop and XenApp products and related services, and anticipates that these products and future derivative products and product lines based upon this technology will continue to constitute a majority of its revenue. The Company could experience declines in demand for its Mobile and Desktop products and other products, whether as a result of general economic conditions, the delay or reduction in technology purchases, new competitive product releases, price competition, lack of success of its strategic partners, technological change or other factors.
Cost of Net Revenues
Cost of product and license revenues consists primarily of hardware, product media and duplication, manuals, packaging materials, shipping expense, server capacity costs. In addition, the Company is a party to licensing agreements with various entities, which give the Company the right to use certain software code in its products or in the development of future products in exchange for the payment of fixed fees or amounts based upon the sales of the related product. The licensing agreements generally have terms ranging from one to five years, and generally include renewal options. However, some agreements are perpetual unless expressly terminated. Royalties and other costs related to these agreements are included in cost of net revenues. Cost of services and maintenance revenue consists primarily of compensation and other personnel-related costs of providing technical support and consulting, as well as the Company’s SaaS. Also included in cost of net revenues is amortization of product related intangible assets which includes acquired core and product technology and associated patents.
Foreign Currency
The functional currency for all of the Company’s wholly-owned foreign subsidiaries in its Enterprise and Service Provider division 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. The functional currency of the Company’s wholly-owned foreign subsidiaries of its SaaS division is the currency of the country in which each subsidiary is located. The Company translates assets and liabilities of these foreign subsidiaries at exchange rates in effect at the balance sheet date. The Company includes accumulated net translation adjustments in equity as a component of Accumulated other comprehensive income (loss). 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. Remeasurement and foreign currency transaction (losses) gains of approximately $(4.9) million, $(3.3) million and $4.7 million for the years ended December 31, 2013, 2012, and 2011, respectively, are included in Other (expense) income, net, in the accompanying consolidated statements of income.
Derivatives and Hedging Activities
In accordance with the authoritative guidance, the Company records derivatives at fair value as either assets or liabilities on the balance sheet. For derivatives that are designated as and qualify as effective cash flow hedges, the portion of gain or loss on the derivative instrument effective at offsetting changes in the hedged item is reported as a component of Accumulated other comprehensive income (loss) and reclassified into earnings as operating expense, net, when the hedged transaction affects earnings. Derivatives not designated as hedging instruments are adjusted to fair value through earnings as Other (expense) income, net, in the period during which changes in fair value occur. The application of the authoritative guidance could impact the volatility of earnings.
The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes attributing all derivatives that are designated as cash flow hedges to floating rate assets or liabilities or forecasted transactions. The Company also formally assesses, both at the inception of the hedge and on an ongoing basis, whether each derivative is highly effective in offsetting changes in cash flows of the hedged item. Fluctuations in the value of the derivative instruments are generally offset by changes in the hedged item; however, if it is determined that a derivative is not highly effective as a hedge or if a derivative ceases to be a highly effective hedge, the Company will discontinue hedge accounting prospectively for the affected derivative.
The Company is exposed to risk of default by its hedging counterparties. Although this risk is concentrated among a limited number of counterparties, the Company’s foreign exchange hedging policy attempts to minimize this risk by placing limits on the amount of exposure that may exist with any single financial institution at a time.
Pension Liability
The Company provides retirement benefits to certain employees who are not U.S. based. Generally, benefits under these programs are based on an employee’s length of service and level of compensation. The majority of these programs are commonly referred to as termination indemnities, which provide retirement benefits in accordance with programs mandated by the governments of the countries in which such employees work.
The Company had accrued $9.2 million and $9.8 million for these pension liabilities at December 31, 2013 and 2012, respectively. Expenses for the programs for 2013, 2012 and 2011 amounted to $3.5 million, $1.5 million and $1.8 million, respectively.
Advertising Costs
The Company expenses advertising costs as incurred. The Company has advertising agreements with, and purchases advertising from, online media providers to advertise its SaaS. The Company also has cooperative advertising agreements with certain distributors and resellers whereby the Company will reimburse distributors and resellers for qualified advertising of Company products. Reimbursement is made once the distributor, reseller or provider provides substantiation of qualified expenses. The Company estimates the impact of these expenses and recognizes them at the time of product sales as a reduction of net revenue in the accompanying consolidated statements of income. The total costs the Company recognized related to advertising were approximately $146.5 million, $137.5 million and $130.8 million, during the years ended December 31, 2013, 2012 and 2011, respectively.
Income Taxes
The Company and one or more of its subsidiaries is subject to United States federal income taxes, 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 2009.
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, 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.
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 consolidated financial statements. 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.
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 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 provision for vacant facility costs, 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 consolidated financial position and results of operations taken as a whole, the actual amounts of such items, when known, will vary from these estimates.
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 consolidated financial statements using a fair value method. See Note 7 for further information regarding the Company’s stock-based compensation plans.
Net Income Per Share Attributable to Citrix Systems, Inc. Stockholders
Net income per share attributable to Citrix Systems, Inc. stockholders - basic is calculated by dividing income available to stockholders by the weighted-average number of common shares outstanding during each period. Net income per share attributable to Citrix Systems, Inc. stockholders - diluted 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 vesting or exercise of stock awards (calculated using the treasury stock method) during the period they were outstanding. Certain shares under the Company’s stock-based compensation programs were excluded from the computation of diluted earnings per share due to their anti-dilutive effect for the respective periods in which they were outstanding. The reconciliation of the numerator and denominator of the earnings per share calculation is presented in Note 13.
Reclassifications
Certain reclassifications of the prior years' amounts have been made to conform to the current year's presentation. In the Property and Equipment table above, the Company determined it was more practical to present Assets under construction on a separate line as opposed to including the amounts within each asset class. Therefore, the reclassifications only resulted in changes to the amounts between asset classes.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combination, Description [Abstract]	'
ACQUISITIONS	'
	ACQUISITIONS
	2013 Acquisitions
	Zenprise
	In January 2013, the Company acquired all of the issued and outstanding securities of Zenprise, Inc. ("Zenprise"), a
	privately-held leader in mobile device management. Zenprise became part of the Company's Enterprise and Service Provider division, in which Citrix has integrated the Zenprise offering for mobile device management into its XenMobile Enterprise edition. The total consideration for this transaction was approximately $324.0 million, net of $2.9 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition were approximately $0.6 million, of which the Company expensed approximately $0.1 million during the year ended December 31, 2013 and are included in General and administrative expense in the accompanying consolidated statements of income. In addition, in connection with the acquisition, the Company assumed certain stock options, which are exercisable for up to 285,817 shares of the Company's common stock, for which the vesting period reset fully upon the closing of the transaction.
	2013 Other Acquisitions
	During the third quarter of 2013, the Company acquired all of the issued and outstanding securities of a privately-held company. The total cash consideration for this transaction was approximately $5.3 million. The Company will pay contingent consideration of up to $3.0 million in cash upon the satisfaction of certain milestone achievements, as defined pursuant to the share purchase agreement. This business became part of the Company's SaaS division. Transaction costs associated with the acquisition were approximately $0.2 million, all of which the Company expensed during the year ended December 31, 2013, and are included in General and administrative expense in the accompanying consolidated statements of income.
	During the fourth quarter of 2013, the Company acquired all of the issued and outstanding securities of a privately-held company. The total cash consideration for this transaction was approximately $5.5 million. This business became part of the Company's Enterprise and Service Provider division. Transaction costs associated with the acquisition were approximately $0.2 million, all of which the Company expensed during the year ended December 31, 2013, and are included in General and administrative expense in the accompanying consolidated statements of income.
	The two acquisitions discussed in this section captioned 2013 Other Acquisitions will collectively be referred to herein as the "2013 Other Acquisitions".
	Purchase Accounting for the Acquisitions in 2013
	The purchase prices for the companies acquired during the year ended December 31, 2013, which include Zenprise and the 2013 Other Acquisitions (collectively, the "2013 Acquisitions"), were allocated to the acquired net tangible and intangible assets based on estimated fair values as of the date of the acquisition. The allocation of the total purchase prices are summarized below (in thousands):
		Zenprise					2013 Other Acquisitions
		Purchase Price Allocation			Asset Life		Purchase Price Allocation			Asset Life
	Current assets	$	10,943				$	3,586
	Other assets	668					—
	Property and equipment	431			Various		—
	Deferred tax assets, non-current	38,785					3,177
	Intangible assets	69,200			1-7 years		11,300			5-6 years
	Goodwill	247,273			Indefinite		4,195			Indefinite
	Assets acquired	367,300					22,258
	Current liabilities assumed	(8,475		)			(3,950		)
	Deferred tax liabilities, current	—					(2,000		)
	Long-term liabilities assumed	(3,107		)			(1,000		)
	Deferred tax liabilities, non-current	(28,725		)			(1,699		)
	Net assets acquired	$	326,993				$	13,609
	Current assets acquired in connection with the 2013 Acquisitions consisted primarily of cash and accounts receivable. Current liabilities assumed in connection with the 2013 Acquisitions consisted primarily of current portion of deferred revenues, short-term payables, other accrued expenses and short-term debt, which was paid in full subsequent to the respective acquisition date. Long-term liabilities assumed in connection with the 2013 Acquisitions consisted of other long-term liabilities and long-term portion of deferred revenues.
	The Company continues to evaluate certain income tax assets and liabilities related to the 2013 Other Acquisitions. Goodwill from the 2013 Acquisitions was assigned to the respective segments each businesses became part of. The goodwill related to the 2013 Acquisitions is not deductible for tax purposes. See Note 11 for segment information. The goodwill amounts are comprised primarily of expected synergies from combining operations and other intangible assets that do not qualify for separate recognition.
	Revenues from the 2013 Acquisitions are included in the revenues of each business's respective segment. The Company has included the effect of the 2013 Acquisitions in its results of operations prospectively from the date of acquisition.
	Identifiable intangible assets acquired in connection with the 2013 Acquisitions (in thousands) and the weighted-average lives are as follows:
		Zenprise			Asset Life		2013 Other Acquisitions			Asset Life
	Trade names	$	2,400		3.0 years		$	—
	Non-compete agreements	700			1.0 year		—
	Customer relationships	18,300			7.0 years		3,600			6.0 years
	Core and product technologies	47,800			6.0 years		6,300			5.0 years
	In-process R&D (1)	—					1,400			Indefinite
	Total	$	69,200				$	11,300
	(1) Capitalized acquired in-process R&D costs will remain capitalized until such time as the projects are complete, at which point they will be amortized, or they will be written off when it is probable the projects will not be completed.
	The following unaudited pro-forma information combines the consolidated results of the operations of the Company and the 2013 Acquisitions as if the acquisitions had occurred at the beginning of fiscal year 2012 (in thousands, except per share data):
		Year Ended December 31,
		2013			2012
	Revenues	$	2,921,604		$	2,596,227
	Income from operations	376,936			333,077
	Net income	336,250			314,300
	Per share - basic	1.8			1.68
	Per share - diluted	1.79			1.66
	In July 2012, the Company acquired all of the issued and outstanding securities of ByteMobile, Inc. (“ByteMobile”), a privately-held provider of data and video optimization solutions for mobile network operators. ByteMobile became part of the Company's Enterprise and Service Provider division and extends the Company's industry reach into the mobile and cloud markets. The total consideration for this transaction was approximately $399.5 million, net of $5.6 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition were approximately $2.1 million, all of which the Company expensed during the year ended December 31, 2012 and are included in General and administrative expense in the accompanying consolidated statements of income. Revenues from the ByteMobile acquisition are included in the revenue of the Company's Enterprise and Service Provider division. The Company has included the effect of the ByteMobile acquisition in its results of operations prospectively from the date of acquisition.
	Purchase Accounting for the ByteMobile acquisition
	During the twelve months ended December 31, 2013, the Company made net adjustments to goodwill of approximately $3.3 million to the purchase price allocation associated with the ByteMobile acquisition. Goodwill from the ByteMobile acquisition was assigned to the Company's Enterprise and Service Provider division. The goodwill related to the ByteMobile acquisition is not deductible for tax purposes. See Note 2 for information on adjustments to goodwill and Note 11 for segment information. The goodwill amounts are comprised primarily of expected synergies from combining operations and other intangible assets that do not qualify for separate recognition.
	The purchase price for ByteMobile was allocated to the acquired net tangible and intangible assets based on its estimated fair value as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands):
		ByteMobile
		Purchase Price Allocation			Asset Life
	Current assets	$	57,796
	Other assets	7,406
	Property and equipment	2,484			Various
	Deferred tax assets, non-current	44,934
	Intangible assets	248,900			1-9 years
	Goodwill	221,914			Indefinite
	Assets acquired	583,434
	Current liabilities assumed	(62,313		)
	Long-term liabilities assumed	(4,083		)
	Deferred tax liabilities, non-current	(111,904		)
	Net assets acquired	$	405,134
	Current assets acquired in connection with the ByteMobile acquisition consisted primarily of cash and accounts receivable. Current liabilities assumed in connection with the ByteMobile acquisition consisted primarily of current portion of deferred revenues, short-term payables, other accrued expenses and short-term debt which was paid in full subsequent to the acquisition date. Long-term liabilities assumed in connection with the ByteMobile acquisition consisted of other long-term liabilities, long-term portion of deferred revenues and long-term debt, which was paid in full subsequent to the acquisition date. Identifiable intangible assets acquired in connection with the ByteMobile acquisition included trade names of $6.0 million with a weighted-average asset life of 6.0 years, customer relationships of $141.5 million with a weighted-average life of 9.0 years, and core and product technologies of $101.4 million with a weighted-average life of 4.8 years.
Podio
In April 2012, the Company acquired all of the issued and outstanding securities of Podio ApS (“Podio”), a privately-held provider of a cloud-based collaborative work platform. Podio became part of the Company's SaaS division and expands the Company's offerings of integrated cloud-based support for team-based collaboration. The total consideration for this transaction was approximately $43.6 million, net of $1.7 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition were approximately $0.5 million, all of which the Company expensed during the year ended December 31, 2012 and are included in General and administrative expense in the accompanying consolidated statements of income. The Company recorded approximately $24.5 million of goodwill, which is not deductible for tax purposes, and acquired $24.6 million of identifiable intangible assets, of which $20.7 million is related to product related intangible assets and $3.9 million is related to other intangible assets. In addition, in connection with the acquisition, the Company assumed non-vested stock units which were converted into the right to receive up to 127,668 shares of the Company's common stock, for which the vesting period reset fully upon the closing of the transaction.
2012 Other Acquisitions
During the first quarter of 2012, the Company acquired all of the issued and outstanding securities of a privately-held company for total cash consideration of approximately $24.6 million, net of $0.6 million of cash acquired. This business became part of the Company’s Enterprise and Service Provider division. Transaction costs associated with the acquisition were approximately $0.5 million, of which the Company expensed $0.4 million and $0.1 million during the years ended December 31, 2012 and 2011, respectively, and are included in General and administrative expense in the accompanying consolidated statements of income. The Company recorded approximately $22.8 million of goodwill, which is not deductible for tax purposes, and acquired $11.0 million of identifiable intangible assets, all of which is related to product related intangible assets. In addition, in connection with this acquisition, the Company assumed non-vested stock units which were converted into the right to receive up to 13,481 shares of the Company's common stock and assumed certain stock options which are exercisable for 12,017 shares of the Company's common stock, for which the vesting period reset fully upon the closing of the transaction.
During the second quarter of 2012, the Company acquired all of the issued and outstanding securities of two privately-held companies for a total cash consideration of approximately $15.4 million, net of $0.2 million of cash acquired. The businesses became part of the Company's Enterprise and Service Provider division. Transaction costs associated with the acquisitions were approximately $0.4 million, all of which the Company expensed during the year ended December 31, 2012 and are included in General and administrative expense in the accompanying consolidated statements of income. In addition, in connection with the acquisitions, the Company assumed non-vested stock units which were converted into the right to receive, in the aggregate, up to 66,459 shares of the Company's common stock, for which the vesting period reset fully upon the closing of each respective transaction.
During the third quarter of 2012, the Company acquired all of the issued and outstanding securities of two privately-held companies for a total cash consideration of approximately $5.3 million. One of the businesses became part of the Company's Enterprise and Service Provider division and the other became part of the Company's SaaS division. Transaction costs associated with the acquisitions were approximately $0.2 million, all of which the Company expensed during the year ended December 31, 2012 and are included in General and administrative expense in the accompanying consolidated statements of income. In addition, in connection with the acquisitions, the Company assumed non-vested stock units which were converted into the right to receive, in the aggregate, up to 13,487 shares of the Company's common stock, for which the vesting period reset fully upon the closing of each respective transaction.
Subsequent Events
On January 8, 2014, the Company acquired all of the issued and outstanding securities of Framehawk, Inc. ("Framehawk"). The Framehawk solution, which optimizes the delivery of virtual desktops and applications to mobile devices, will be combined with HDX technology in the Citrix XenApp and XenDesktop products to deliver an unparalleled user experience under adverse network conditions. The total preliminary consideration for this transaction was approximately $27.9 million, net of $0.3 million of cash acquired, and was paid in cash. Transaction costs associated with the acquisition are currently estimated at $0.1 million, all of which the Company expensed during the year ended December 31, 2013 and are included in General and administrative expense in the accompanying consolidated statements of income.

Investments

Investments	12 Months Ended
	Dec. 31, 2013
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):
		December 31, 2013									December 31, 2012
	Description of the Securities	Amortized		Gross		Gross			Fair Value		Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized					Cost		Unrealized		Unrealized
				Gains		Losses							Gains		Losses
	Agency securities	$	453,922	$	1,177	$	(349	)	$	454,750	$	400,365	$	2,347	$	(5	)	$	402,707
	Corporate securities	643,360		947		(216		)	644,091		404,546		947		(171		)	405,322
	Municipal securities	53,698		81		(23		)	53,756		32,214		114		(15		)	32,313
	Government securities	156,930		196		(47		)	157,079		39,863		131		(1		)	39,993
	Total	$	1,307,910	$	2,401	$	(635	)	$	1,309,676	$	876,988	$	3,539	$	(192	)	$	880,335
	The change in net unrealized gains (losses) on available-for-sale securities recorded in Other comprehensive income (loss) includes unrealized gains (losses) that arose from changes in market value of specifically identified securities that were held during the period, gains (losses) that were previously unrealized, but have been recognized in current period net income due to sales, as well as prepayments of available-for-sale investments purchased at a premium. This reclassification has no effect on total comprehensive income or equity and was not material for all periods presented. See Note 14 for more information related to comprehensive income.
	The average remaining maturities of the Company’s short-term and long-term available-for-sale investments at December 31, 2013 were approximately five months and three years, respectively.
	Realized Gains and Losses on Available-for-sale Investments
	For the years ended December 31, 2013 and 2012, the Company had realized gains on the sales of available-for-sale investments of $3.0 million and $4.1 million, respectively. For the years ended December 31, 2013 and 2012, the Company had realized losses on available-for-sale investments of $2.7 million and $0.8 million, respectively, primarily related to prepayments at par of securities purchased at a premium. All realized gains and losses related to the sales of available-for-sale investments are included in Other (expense) income, net, in the accompanying consolidated statements of income.
	The Company continues to monitor its overall investment portfolio and if the credit ratings of the issuers of its investments deteriorate or if the issuers experience financial difficulty, including bankruptcy, the Company may be required to make adjustments to the carrying value of the securities in its investment portfolio and recognize impairment charges for declines in fair value that are determined to be other-than-temporary.
	Other-Than-Temporary Impairment on Available-for-Sale Investments
	There were no other-than-temporarily impaired available-for-sale investments during the twelve months ended December 31, 2013. During 2012, one of the Company’s available-for-sale investments with a carrying amount of $5.0 million was determined to be other-than-temporarily impaired. As a result of this determination, the investment was written down to its fair value of $2.5 million, resulting in an impairment charge of $2.5 million. The impairment charge is included in Other (expense) income, net in the accompanying 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 were $0.6 million and $0.2 million as of December 31, 2013 and 2012, 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 $24.3 million and $26.2 million as of December 31, 2013 and 2012, respectively, which are accounted for based on the cost method and are included in Other assets in the accompanying 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. During 2013 and 2012, certain companies in which the Company held direct investments were acquired by third parties and as a result of these sales transactions the Company recorded gains of $6.0 million and $16.5 million, respectively, which was included in Other (expense) income, net in the accompanying consolidated statements of income. The Company determined that certain cost method investments were impaired during 2013, 2012 and 2011 and recorded a total charge of $3.7 million, $3.5 million, and $3.5 million, respectively, which is included in Other (expense) income, net in the accompanying consolidated statements of income. See Note 5 for more information.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
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 gathers observable inputs for all of the Company’s fixed income securities from a variety of industry data providers including, for example, large custodial institutions and other third-party sources. Once the observable inputs are gathered by the Service, all data points are considered and an average price is determined. 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 December 31, 2013			Quoted		Significant		Significant
					Prices In		Other		Unobservable
					Active Markets		Observable		Inputs (Level 3)
					for Identical		Inputs (Level 2)
					Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	227,528		$	227,528	$	—	$	—
	Money market funds	52,823			52,823		—		—
	Corporate securities	389			—		389		—
	Available-for-sale securities:
	Agency securities	454,750			—		454,750		—
	Corporate securities	644,091			—		633,801		10,291
	Municipal securities	53,756			—		53,756		—
	Government securities	157,079			—		157,079		—
	Prepaid expenses and other current assets:
	Foreign currency derivatives	4,952			—		4,952		—
	Total assets	$	1,595,368		$	280,351	$	1,304,727	$	10,291
	Accrued expenses and other current liabilities:
	Foreign currency derivatives	1,743			—		1,743		—
	Total liabilities	$	1,743		$	—	$	1,743	$	—
		As of December 31, 2012			Quoted		Significant		Significant
					Prices In		Other		Unobservable
					Active Markets		Observable		Inputs (Level 3)
					for Identical		Inputs (Level 2)
					Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	503,614		$	503,614	$	—	$	—
	Money market funds	123,519			123,519		—		—
	Corporate securities	16,476			—		16,476		—
	Available-for-sale securities:
	Agency securities	402,707			—		402,707		—
	Corporate securities	405,322			—		401,981		3,341
	Municipal securities	32,313			—		32,313		—
	Government securities	39,993			—		39,993		—
	Prepaid expenses and other current assets:
	Foreign currency derivatives	4,157			—		4,157		—
	Total assets	$	1,528,101		$	627,133	$	897,627	$	3,341
	Accrued expenses and other current liabilities:
	Foreign currency derivatives	4,162			—		4,162		—
	Total liabilities	$	4,162		$	—	$	4,162	$	—
	The Company’s fixed income available-for-sale security portfolio generally consists of high quality, investment grade securities from diverse issuers with a minimum credit rating of A-/A3 and a minimum 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 Recurring Basis Using Significant Unobservable Inputs (Level 3)
	The Company has invested in convertible debt securities of certain early-stage entities that are classified as available-for-sale investments. As quoted prices in active markets or other observable inputs were not available for these investments, in order to measure them at fair value, the Company utilized a discounted cash flow model using a discount rate reflecting the market risk inherent in holding securities of an early-stage enterprise, adjusted by the probability-weighted exit possibilities associated with the convertible debt securities. This methodology required the Company to make assumptions that were not directly or indirectly observable regarding the fair value of the convertible debt securities; accordingly they are a Level 3 valuation and included in the table below.
		Investments
		(in thousands)
	Balance at December 31, 2012	$	3,341
	Purchases of Level 3 securities	9,700
	Transfers out of Level 3	(2,750		)
	Balance at December 31, 2013	$	10,291
	Transfers out of Level 3 relate to certain of the Company's investments in convertible debt securities of early-stage entities that were previously classified as available-for-sale investments to cost method investments upon conversion to equity ownership, which are included in Other assets in the accompanying consolidated balance sheets.
Assets Measured at Fair Value on a Non-recurring Basis Using Significant Unobservable Inputs (Level 3)
During 2013 and 2012, certain cost method investments with a combined carrying value of $9.3 million and $13.0 million, respectively, were determined to be impaired and have been written down to their fair values of $5.6 million and $9.5 million, respectively, resulting in impairment charges of $3.7 million and $3.5 million, respectively. The impairment charges are included in Other (expense) income, net in the accompanying consolidated financial statements for the years ended December 31, 2013 and 2012. 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 investment represents a Level 3 valuation as the assumptions used in valuing this investment were not directly or indirectly observable. See Note 4 for more information regarding cost method investments.
Additional Disclosures Regarding Fair Value Measurements
The carrying value of accounts receivable, accounts payable and accrued expenses and other current liabilities approximate their fair value due to the short maturity of these items.

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	12 Months Ended
	Dec. 31, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]	'
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES	'
	ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
	Accrued expenses consist of the following:
		December 31,
		2013		2012
		(In thousands)
	Accrued compensation and employee benefits	$	141,065	$	130,835
	Other accrued expenses	116,541		126,300
	Total	$	257,606	$	257,135

Employee_StockBased_Compensati

Employee Stock-Based Compensation and Benefit Plans	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
EMPLOYEE STOCK-BASED COMPENSATION AND BENEFIT PLANS	'
	EMPLOYEE STOCK-BASED COMPENSATION AND BENEFIT PLANS
	Plans
	The Company’s stock-based compensation program is a long-term retention program that is intended to attract and reward talented employees and align stockholder and employee interests. As of December 31, 2013, the Company had two stock-based compensation plans under which it was granting stock options and non-vested stock units. The Company is currently granting stock-based awards from its Amended and Restated 2005 Equity Incentive Plan (as amended, the “2005 Plan”) and its Amended and Restated 2005 Employee Stock Purchase Plan (as amended, the “2005 ESPP”). In February 2014, the Company's Board of Directors approved the 2014 Equity Incentive Plan, which is subject to stockholder approval at the Company Annual Meeting of Stockholders on May 22, 2014. There will be no grants under this plan until the plan is approved by the Company's stockholders. 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 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 plan includes the Amended and Restated 1995 Stock Plan.
	Under the terms of the 2005 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. Currently, the 2005 Plan provides for the issuance of a maximum of 48,600,000 shares of common stock. Under the 2005 Plan, ISOs must be granted at exercise prices no less than fair market value on the date of grant, except for ISOs granted to employees who own more than 10% of the Company’s combined voting power, for which the exercise prices must be no less than 110% of the fair market value at the date of grant. NSOs and SARs must be granted at no less than fair market value on the date of grant, or in the case of SARs in tandem with options, at the exercise price of the related option. 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 December 31, 2013, there were 26,960,367 shares of common stock reserved for issuance pursuant to the Company’s stock-based compensation plans and the Company had authorization under its 2005 Plan to grant 16,605,208 additional stock-based awards.
	Under the 2005 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 the last business day of a Payment Period. Employees who, after exercising their rights to purchase shares of common stock in the 2005 ESPP, would own shares representing 5% or more of the voting power of the Company’s common stock, are ineligible to participate under the 2005 ESPP. The 2005 ESPP provides for the issuance of a maximum of 10,000,000 shares of common stock. As of December 31, 2013, 2,991,834 shares had been issued under the 2005 ESPP. The Company recorded stock-based compensation costs related to the 2005 ESPP of $4.9 million, $4.0 million and $3.5 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	Expense Information under the Authoritative Guidance
	As required by the authoritative guidance, the Company estimates forfeitures of stock awards and recognizes compensation costs only for those awards expected to vest. Forfeiture rates are determined based on historical experience. The Company also considers whether there have been any significant changes in facts and circumstances that would affect its forfeiture rate quarterly. Estimated forfeitures are adjusted to actual forfeiture experience as needed. The Company recorded stock-based compensation costs, related deferred tax assets and tax benefits of $183.9 million, $57.1 million and $55.7 million, respectively, in 2013, $149.9 million, $46.7 million and $65.8 million, respectively, in 2012 and $92.9 million, $28.4 million and $67.9 million, respectively, in 2011.
	The detail of the total stock-based compensation recognized by income statement classification is as follows (in thousands):
	Income Statement Classifications	2013				2012		2011
	Cost of services revenues	$	2,540			$	2,111	$	1,584
	Research and development	63,448				54,616		31,763
	Sales, marketing and services	65,549				51,519		31,354
	General and administrative	52,404				41,694		28,208
	Total	$	183,941			$	149,940	$	92,909
	Stock Options
	Stock options granted under the 2005 Plan typically have a five-year life and vest over three years, with 33.3% of the shares underlying the option vesting on the first anniversary of the date of grant and the remainder of the underlying shares vesting in equal installments at a rate of 2.78% thereafter (the "Standard Vesting Rate"). The Company also assumes stock options from certain of its acquisitions for which the vesting period is typically reset to vest over three years at the Standard Vesting Rate. During the first quarter of 2013, the Company assumed in-the-money options from the Zenprise acquisition. See Note 3 for more information related to acquisitions.
	A summary of the status and activity of the Company’s fixed option awards is as follows:
	Options		Number of			Weighted-		Weighted-		Aggregate
			Options			Average		Average		Intrinsic
						Exercise		Remaining		Value
						Price		Contractual		(in thousands)
								Life
								(in years)
	Outstanding at December 31, 2012		7,589,532			$	54.15	2.7
	Assumed		285,817			11.85
	Exercised		(2,168,531	)		33.97
	Forfeited or expired		(299,841	)		60.9
	Outstanding at December 31, 2013		5,406,977			59.64		2.15		$	57,583
	Vested or expected to vest		5,366,212			59.78		2.14		$	56,548
	Exercisable at December 31, 2013		4,438,465			61.88		1.93		$	38,167
	The Company recognized stock-based compensation expense of $48.9 million, $56.4 million and $48.2 million related to options for the years ended December 31, 2013, 2012 and 2011, respectively. As of December 31, 2013, there was $29.7 million of total unrecognized compensation cost related to stock options. That cost is expected to be recognized over a weighted-average period of 1.22 years. The total intrinsic value of stock options exercised during 2013, 2012 and 2011 was $77.7 million, $131.4 million and $169.2 million, respectively.
	Stock Option Valuation Information
	The Company uses the Black-Scholes option pricing model to determine the fair value of stock options. The determination of the fair value of stock-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price, as well as assumptions regarding a number of complex and subjective variables. These variables include the Company’s expected stock price, volatility over the term of the awards, actual employee exercise behaviors, risk-free interest rate and expected dividends. For purposes of valuing stock options, the Company determined the expected volatility factor by considering the implied volatility in two-year market-traded options of the Company’s common stock based on third party volatility quotes in accordance with the provisions of SAB No. 107, Share Based Payment. 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 approximate risk free interest rate was based on the implied yield available on U.S. Treasury zero-coupon issues with remaining terms equivalent to the Company’s expected terms on stock options. The expected term of stock options was based on the historical employee exercise patterns. In years when a significant number of stock options are granted, the Company analyzes its historical pattern of option exercises based on certain demographic characteristics annually and has historically determined that there were no meaningful differences in option exercise activity based on demographic characteristics. 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 option pricing model. The weighted-average fair value of stock options granted and/or assumed during 2013, 2012 and 2011 was $56.97, $23.95 and $29.91, respectively.
	The assumptions used to value options granted and/or assumed are as follows:
		Stock options granted or assumed during
		2013		2012		2011
	Expected volatility factor	0.39		0.38 - 0.43		0.38 - 0.50
	Approximate risk free interest rate	0.40%		0.5% - 0.7%		0.6% - 1.1%
	Expected term (in years)	3.35		3.91		3.27 - 3.91
	Expected dividend yield	0%		0%		0%
	Non-vested Stock Units
	Market and Service Condition Stock Units
	In March 2013 and 2012, the Company granted senior level employees non-vested stock unit awards representing, in the aggregate, 399,029 and 418,809 non-vested stock units, respectively, that vest based on certain target market performance and service conditions. The number of non-vested stock units underlying each award will be determined within sixty days of the calendar year following the end of a three-year performance period ending December 31, 2015 for the March 2013 awards and December 31, 2014 for the March 2012 awards. 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 issued will be based on interpolation, with the maximum number of non-vested stock units issuable pursuant to the award capped at 200% of the target number of non-vested stock units set forth in the award agreement 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 2013 Grant		March 2012 Grant
	Expected volatility factor	0.16 - 0.42		0.21 - 0.39
	Risk free interest rate	0.33	%	0.47	%
	Expected dividend yield	0	%	0	%
	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 the most recent 2.75 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 each award as of the date of grant was $89.93 for the March 2013 grant and $89.95 for the March 2012 grant.
	Service Based Stock Units
	The Company also awards senior level and certain other employees non-vested stock units granted under the 2005 Plan that vest based on service. The majority of these non-vested stock unit awards vest 33.33% on each anniversary subsequent to the date of the award. The remaining awards vest 100% on the third anniversary of the grant date. 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 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.
	The following table summarizes the Company's non-vested stock unit activity for the year ended December 31, 2013:
			Number of			Weighted-
			Shares			Average
						Fair Value
						at Grant Date
	Non-vested stock units at December 31, 2012		3,607,561			$	74.7
	Granted		2,765,386			71.84
	Vested		(1,375,165	)		69.36
	Forfeited		(365,803	)		76.16
	Non-vested stock units at December 31, 2013		4,631,979			74.47
	For the years ended December 31, 2013, 2012 and 2011, the Company recognized stock-based compensation expense of $130.2 million, $89.5 million and $40.0 million, respectively, related to non-vested stock units. The fair value of the non-vested stock units released in 2013, 2012, and 2011 was $95.4 million, $50.3 million and $21.3 million, respectively. As of December 31, 2013, there was $237.8 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 1.96 years.
	Benefit Plan
The Company maintains a 401(k) benefit plan allowing eligible U.S.-based employees to contribute up to 60% of their annual compensation, limited to an annual maximum amount as set periodically by the IRS. The Company, at its discretion, may contribute up to $0.50 for each dollar of employee contribution. The Company’s total matching contribution to an employee is typically made at 3% of the employee’s annual compensation. The Company’s matching contributions were $12.7 million, $10.5 million and $9.1 million in 2013, 2012 and 2011, respectively. The Company’s contributions vest over a four-year period at 25% per year.

Capital_Stock

Capital Stock	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
CAPITAL STOCK	'
	CAPITAL STOCK
	Stock Repurchase Programs
	The Company’s Board of Directors authorized an ongoing stock repurchase program with a total repurchase authority granted to the Company of $3.9 billion, of which $500.0 million was approved in October 2013. 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 December 31, 2013, approximately $429.3 million was available to repurchase common stock pursuant to the stock repurchase program. All shares repurchased are recorded as treasury stock in the Company's consolidated balance sheets. A portion of the funds used to repurchase stock over the course of the program was provided by 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 or pursuant to a Rule 10b5-1 plan.
	During the year ended December 31, 2013, the Company expended approximately $406.3 million on open market purchases, repurchasing 6,563,986 shares of outstanding common stock at an average price of $61.90.
	During the year ended December 31, 2012, the Company expended approximately $251.0 million on open market purchases, repurchasing 3,550,817 shares of outstanding common stock at an average price of $70.69.
	During the year ended December 31, 2011, the Company expended approximately $424.8 million on open market purchases, repurchasing 6,275,470 shares of outstanding common stock at an average price of $67.70.
	Shares for Tax Withholding
	During the years ended December 31, 2013, 2012 and 2011, the Company withheld 444,657 shares, 269,745 shares and 182,203 shares, respectively, from stock units that vested. Amounts withheld to satisfy minimum tax withholding obligations that arose on the vesting of stock units was $31.0 million, $20.2 million and $13.3 million, for 2013, 2012 and 2011, respectively. These shares are reflected as treasury stock in the Company's consolidated balance sheets and statements of equity and the related cash outlays reduce the Company's total stock repurchase authority.
	Preferred Stock
	The Company is authorized to issue 5,000,000 shares of preferred stock, $0.01 par value per share. No shares of such preferred stock were issued and outstanding at December 31, 2013 or 2012.

Commitments_And_Contingencies

Commitments And Contingencies	12 Months Ended
	Dec. 31, 2013
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.
	Rental expense for the years ended December 31, 2013, 2012 and 2011 totaled approximately $70.9 million, $65.1 million and $56.5 million, respectively. Sublease income for the years ended December 31, 2013, 2012 and 2011 was approximately $0.3 million, $0.2 million and $0.2 million, respectively. Lease commitments under non-cancelable operating leases with initial or remaining terms in excess of one year and sublease income associated with non-cancelable subleases, are as follows:
		Operating		Sublease
		Leases		Income
		(In thousands)
	Years ending December 31,
	2014	$	60,982	$	255
	2015	46,770		260
	2016	39,353		227
	2017	22,064		218
	2018	18,536		203
	Thereafter	88,885		—
	Total	$	276,590	$	1,163
	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.
	On April 11, 2008, SSL Services, LLC (“SSL Services”) filed a suit for patent infringement against the Company in the United States District Court for the Eastern District of Texas (the “SSL Matter”). SSL Services alleged that the Company infringed U.S. Patent Nos. 6,061,796 (the “'796 patent”) and 6,158,011 (the “'011 patent”). The Company denied infringement and asserted that the patents-in-suit were invalid. A jury trial was held on SSL Services' claims, and on June 18, 2012, the jury found that the Company does not infringe the '796 patent and found that the Company willfully infringes the '011 patent through the sale and use of certain products. The jury awarded SSL Services $10.0 million. On September 17, 2012, the court issued a final judgment confirming the jury award of $10.0 million in damages and added $5.0 million in enhanced damages and approximately $5.0 million in prejudgment interest on the damages award. The Company does not believe that any of its products infringe the '011 patent, and the Company believes that the '011 patent is invalid. Accordingly, no accrual has been made related to this matter. The Company has appealed the district court's judgment on the '011 patent.
	In addition to the SSL Matter and 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 "Other Matters"). 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 material payments pursuant to these provisions as of December 31, 2013. 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.
	Purchase Obligations
	The Company has agreements with suppliers to purchase inventory and estimates its non-cancelable obligations under these agreements for the fiscal year ended December 31, 2014 to be approximately $13.1 million. The Company also has contingent obligations to purchase inventory for the fiscal year ended December 31, 2014, which are based on amount of usage, of approximately $18.2 million. The Company does not have any purchase obligations beyond December 31, 2014.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	The United States and foreign components of income before income taxes are as follows:
			2013				2012				2011
			(In thousands)
	United States		$	142,085			$	200,802			$	176,824
	Foreign		245,805				209,427				253,673
	Total		$	387,890			$	410,229			$	430,497
	The components of the provision for income taxes are as follows:
			2013				2012				2011
			(In thousands)
	Current:
	Federal		$	51,389			$	81,019			$	50,022
	Foreign		37,221				30,059				29,169
	State		11,605				17,395				11,905
	Total current		100,215				128,473				91,096
	Deferred:
	Federal		(34,897		)		(64,960		)		(8,631		)
	Foreign		(8,413		)		1,409				(4,792		)
	State		(8,538		)		(7,240		)		(2,806		)
	Total deferred		(51,848		)		(70,791		)		(16,229		)
	Total provision		$	48,367			$	57,682			$	74,867
	The following table presents the breakdown between current and non-current net deferred tax assets:
			December 31,
			2013				2012
			(In thousands)
	Deferred tax assets - current		$	48,470			$	36,846
	Deferred tax liabilities - current		(364		)		(876		)
	Deferred tax assets- non current		115,418				43,097
	Deferred tax liabilities - non current		(13,127		)		(19,756		)
	Total net deferred tax assets		$	150,397			$	59,311
	The significant components of the Company’s deferred tax assets and liabilities consisted of the following:
			December 31,
			2013				2012
			(In thousands)
	Deferred tax assets:
	Accruals and reserves		$	25,556			$	36,128
	Deferred revenue		55,688				41,820
	Tax credits		60,519				43,657
	Net operating losses		103,329				89,856
	Other		10,537				8,452
	Stock based compensation		72,074				54,852
	Depreciation and amortization		1,675				—
	Valuation allowance		(26,465		)		(18,185		)
	Total deferred tax assets		302,913				256,580
	Deferred tax liabilities:
	Depreciation and amortization		—				(40,159		)
	Acquired technology		(136,258		)		(140,017		)
	Prepaid expenses		(16,258		)		(17,093		)
	Total deferred tax liabilities		(152,516		)		(197,269		)
	Total net deferred tax assets		$	150,397			$	59,311
	The authoritative guidance requires a valuation allowance to reduce the deferred tax assets reported if it is not more likely than not that some portion or all of the deferred tax assets will be realized. At December 31, 2013, the Company determined that a $26.5 million valuation allowance relating to deferred tax assets for net operating losses and tax credits was necessary.
	The Company does not expect to remit earnings from its foreign subsidiaries. Undistributed earnings of the Company’s foreign subsidiaries amounted to approximately $1,238.0 million at December 31, 2013. Those earnings are considered to be permanently reinvested and, accordingly, no U.S. federal and state income taxes have been provided thereon. Upon distribution of those earnings in the form of dividends or otherwise, the Company could be subject to both U.S. income taxes (subject to an adjustment for foreign tax credits) and withholding taxes payable to various foreign countries. 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.
	At December 31, 2013, the Company had $220.0 million of remaining net operating loss carry forwards in the United States from acquisitions. The utilization of these net operating loss carry forwards are limited in any one year pursuant to Internal Revenue Code Section 382 and begin to expire in 2019. At December 31, 2013, the Company had $52.0 million of remaining net operating loss carry forwards in foreign jurisdictions that do not expire.
	At December 31, 2013, the Company had research and development tax credit carry forwards of approximately $55.6 million that begin to expire in 2024.
	A reconciliation of the Company’s effective tax rate to the statutory federal rate is as follows:
			Year Ended December 31,
			2013			2012			2011
	Federal statutory taxes		35	%		35	%		35	%
	State income taxes, net of federal tax benefit		1.2			1.9			1.7
	Foreign operations		(14.8	)		(10.2	)		(14.5	)
	Permanent differences		(1.1	)		(2.0	)		1.2
	Tax credits		(10.9	)		(4.7	)		(7.1	)
	Stock option compensation		0.4			0.1			0.1
Change in accruals for uncertain tax positions		3.3			(5.3	)		1.4
Other		(0.6	)		(0.7	)		(0.4	)
		12.5	%		14.1	%		17.4	%
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. It was not practicable to determine the amount of unrecognized deferred tax liability for temporary differences related to investments in foreign subsidiaries.
The Company and certain of its subsidiaries are subject to U.S. federal income taxes, 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 2009.
A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2013 and 2012 is as follows (in thousands):
Balance at January 1, 2012	$	79,199
Additions based on tax positions related to the current year	2,459
Additions for tax positions of prior years	9,558
Reductions related to the expiration of statutes of limitations	(33,594		)
Settlements	(13,718		)
Balance at December 31, 2012	43,904
Additions based on tax positions related to the current year	13,694
Additions for tax positions of prior years	10,611
Reductions related to the expiration of statutes of limitations	(2,116		)
Settlements	(2,301		)
Balance at December 31, 2013	$	63,792
The Company's unrecognized tax benefits may change significantly over the next 12 months.
The Company recognizes interest accrued related to unrecognized tax benefits and penalties in income tax expense. During the year ended December 31, 2013, the Company recognized $0.8 million of expense related to interest and penalties. The Company has no amounts accrued for the payment of interest and penalties at December 31, 2013.
The federal research and development credit expired on December 31, 2011. On January 2, 2013, the American Taxpayer Relief Act of 2012 was signed into law. Under this act, the federal research and development credit was retroactively extended for amounts paid or incurred after December 31, 2011 and before January 1, 2014. The effects of these changes in the tax law will result in net tax benefits of approximately $10.7 million, which were recognized in 2013, the year in which the law was enacted.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
SEGMENT INFORMATION	'
	SEGMENT INFORMATION
	The Enterprise and Service Provider division and the SaaS division 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 division products and SaaS division products. Segment profit for each segment includes certain research and development, sales, marketing, 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, amortization of product related intangible assets, amortization of other intangible assets, net interest and Other (expense) income, net. Accounting policies of the Company’s segments are the same as its consolidated accounting policies.
	International revenues (sales outside of the United States) accounted for approximately 45.4%, 45.3% and 43.2% of the Company’s net revenues for the year ended December 31, 2013, 2012, and 2011, respectively. Net revenues and segment profit for 2013, 2012 and 2011 classified by the Company’s reportable segments, are presented below:
		2013			2012			2011
		(In thousands)
	Net revenues:
	Enterprise and Service Provider division	$	2,335,562		$	2,074,800		$	1,778,646
	SaaS division	582,872			511,323			427,746
	Consolidated	$	2,918,434		$	2,586,123		$	2,206,392
	Segment profit:
	Enterprise and Services Provider division	$	588,138		$	562,794		$	504,883
	SaaS division	116,061			92,498			76,147
	Unallocated expenses (1):
	Amortization of intangible assets	(139,541		)	(114,574		)	(71,131		)
	Restructuring	—			—			(24		)
	Net interest and other income	7,173			19,451			13,531
	Stock-based compensation	(183,941		)	(149,940		)	(92,909		)
	Consolidated income before income taxes	$	387,890		$	410,229		$	430,497
	(1)	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.
	Identifiable assets classified by the Company’s reportable segments are shown below. Long-lived assets consist of property and equipment, net, and are shown below.
		December 31,
		2013			2012
		(In thousands)
	Identifiable assets:
	Enterprise and Service Provider division	$	4,662,724		$	4,246,292
	SaaS division	549,525			550,110
	Total identifiable assets	$	5,212,249		$	4,796,402
		December 31,
		2013			2012
		(In thousands)
	Long-lived assets, net:
	United States	$	258,114		$	231,812
	United Kingdom	29,382			30,633
	Other countries	51,500			40,849
	Total long-lived assets, net	$	338,996		$	303,294
	The increases in identifiable assets are primarily due to goodwill and intangible assets recorded in conjunction with the Company's 2013 Acquisitions. See Note 3 for additional information regarding the Company’s acquisitions.
	In fiscal years 2013, 2012 and 2011, one distributor, Ingram Micro, accounted for 14%, 16% and 17%, respectively, of the Company’s total net revenues. The Company’s distributor arrangements with Ingram Micro consist of several non-exclusive, independently negotiated agreements with its subsidiaries, each of which cover different countries or regions. Each of these agreements is separately negotiated and is independent of any other contract (such as a master distribution agreement), one of which was individually responsible for over 10% of the Company’s total net revenues in each of the last three fiscal years. In fiscal years 2013, 2012 and 2011, there were no resellers that accounted for over 10% of the Company’s total net revenues. Total net revenues associated with Ingram Micro are included in the Company's Enterprise and Service Provider division.
	Revenues by product grouping for the Company’s Enterprise and Service Provider division and SaaS division were as follows for the years ended:
		December 31,
		2013			2012			2011
		(In thousands)
	Net revenues:
	Enterprise and Service Provider division
	Mobile and Desktop revenues(1)	$	1,549,383		$	1,450,850		$	1,278,798
	Networking and Cloud revenues(2)	634,598			496,608			385,518
	Professional services(3)	138,879			119,061			91,496
	Other	12,702			8,281			22,834
	Total Enterprise and Service Provider division revenues	2,335,562			2,074,800			1,778,646
	SaaS division revenues	582,872			511,323			427,746
	Total net revenues	$	2,918,434		$	2,586,123		$	2,206,392
	-1	Mobile and Desktop revenues are primarily comprised of sales from the Company’s desktop and application virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.
	-2	Networking and Cloud revenues are primarily comprised of sales from the Company’s cloud networking products, which include NetScaler, CloudBridge and ByteMobile Smart Capacity, and the Company’s cloud platform products which include XenServer, CloudPlatform and CloudPortal and related license updates and maintenance and support.
	-3	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 years ended:
		December 31,
		2013			2012			2011
		(In thousands)
	Net revenues:
	Enterprise and Service Provider division
	Americas	$	1,263,673		$	1,106,801		$	993,062
	EMEA	785,862			691,111			576,953
	Asia-Pacific	286,027			276,888			208,631
Total Enterprise and Service Provider division revenues	2,335,562			2,074,800			1,778,646
SaaS division
Americas	488,307			433,263			367,260
EMEA	73,529			63,484			50,711
Asia-Pacific	21,036			14,576			9,775
Total SaaS division revenues	582,872			511,323			427,746
Total net revenues	$	2,918,434		$	2,586,123		$	2,206,392
Export revenue represents shipments of finished goods and services from the United States to international customers, primarily in Latin America and Canada. Shipments from the United States to international customers for 2013, 2012 and 2011 were $215.3 million, $127.4 million and $106.0 million, respectively.

Derivative_Financial_Instrumen

Derivative Financial Instruments

12 Months Ended

Dec. 31, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

DERIVATIVE FINANCIAL INSTRUMENTS

'

DERIVATIVE FINANCIAL INSTRUMENTS

Derivatives Designated as Hedging Instruments

As of December 31, 2013, 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 twelve months and the maximum term is eighteen 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 income (loss) includes unrealized gains or losses that arose from changes in market value of the effective portion of derivatives that were held during the period, and gains or losses that were previously unrealized but have been recognized in the same line item as the forecasted transaction in current period net income due to termination or maturities of derivative contracts. This reclassification has no effect on total comprehensive income or equity.

The total cumulative unrealized gain on cash flow derivative instruments was $2.9 million and nil at December 31, 2013 and 2012, respectively, and is included in Accumulated other comprehensive income (loss) in the accompanying consolidated balance sheets. The net unrealized gain as of December 31, 2013 is expected to be recognized in income over the next twelve months at the same time the hedged items are recognized in income.

Derivatives not Designated as Hedges

A substantial portion of the Company’s overseas assets and liabilities are and will continue to be denominated in local currencies. To protect against fluctuations in earnings caused by changes in currency exchange rates when remeasuring the Company’s balance sheet, it utilizes foreign exchange forward contracts to hedge its exposure to this potential volatility.

These contracts are not designated for hedge accounting treatment under the authoritative guidance. Accordingly, changes in the fair value of these contracts are recorded in Other (expense) income, net.

Fair Values of Derivative Instruments

Asset Derivatives

Liability Derivatives

(In thousands)

December 31, 2013

December 31, 2012

December 31, 2013

December 31, 2012

Derivatives Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$4,559

Prepaid

$4,157

Accrued

$1,578

Accrued

$4,162

expenses

expenses

expenses

expenses

and other

and other

and other

and other

current

current

current

current

assets

assets

liabilities

liabilities

Asset Derivatives

Liability Derivatives

(In thousands)

December 31, 2013

December 31, 2012

December 31, 2013

December 31, 2012

Derivatives Not Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$393

Prepaid

$448

Accrued

$165

Accrued

$52

expenses

expenses

expenses

expenses

and other

and other

and other

and other

current

current

current

current

assets

assets

liabilities

liabilities

The Effect of Derivative Instruments on Financial Performance

For the Year ended December 31,

(In thousands)

Derivatives in Cash Flow

Amount of Gain Recognized in Other

Location of Loss Reclassified

Amount of Loss Reclassified from

Hedging Relationships

Comprehensive Income (Loss)

from Accumulated Other

Accumulated Other

(Effective Portion)

Comprehensive Income (Loss) into Income

Comprehensive Income (Loss)

(Effective Portion)

(Effective Portion)

2013

2012

2013

2012

Foreign currency forward contracts

$

2,862

$

5,164

Operating expenses

$

(2,929

)

$

(5,817

)

There was no material ineffectiveness in the Company’s foreign currency hedging program in the periods presented.

For the Year ended December 31,

(In thousands)

Derivatives Not Designated as Hedging Instruments

Location of Gain (Loss) Recognized in Income on

Amount of Gain (Loss) Recognized in Income on Derivative

Derivative

2013

2012

Foreign currency forward contracts

Other (expense) income, net

$

3,138

$

(1,341

)

Outstanding Foreign Currency Forward Contracts

As of December 31, 2013, the Company had the following net notional foreign currency forward contracts outstanding (in thousands):

Foreign Currency

Currency

Denomination

Australian dollars

AUD 8,012

British pounds sterling

GBP 34,475

Canadian dollars

CAD 6,714

Chinese renminbi

CNY 81,250

Danish krone

DKK 1,500

Euro

EUR 27,820

Hong Kong dollars

HKD 51,063

Indian rupees

INR 1,201,622

Japanese yen

JPY 169,004

New Zealand dollars

NZD 300

Singapore dollars

SGD 12,600

Swiss francs

CHF 19,741

Net_Income_Per_Share_Attributa

Net Income Per Share Attributable To Citrix Systems Inc. Stockholders	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
NET INCOME PER SHARE ATTRIBUTABLE TO CITRIX SYSTEMS, INC. STOCKHOLDERS	'
	NET INCOME PER SHARE ATTRIBUTABLE TO CITRIX SYSTEMS, INC. STOCKHOLDERS
	The following table sets forth the computation of basic and diluted net income per share attributable to Citrix Systems, Inc. stockholders (in thousands, except per share information):
		Year Ended December 31,
		2013		2012		2011
	Numerator:
	Net income attributable to Citrix Systems, Inc. stockholders	$	339,523	$	352,547	$	356,322
	Denominator:
	Denominator for basic earnings per share - weighted-average shares outstanding	186,672		186,722		187,315
	Effect of dilutive employee stock awards:
	Employee stock awards	1,573		2,407		3,326
	Denominator for diluted earnings per share - weighted-average shares outstanding	188,245		189,129		190,641
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic	$	1.82	$	1.89	$	1.9
	Net income per share attributable to Citrix Systems, Inc. stockholders - diluted	$	1.8	$	1.86	$	1.87
	Anti-dilutive weighted-average shares	3,647		3,464		2,576

Comprehensive_Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
COMPREHENSIVE INCOME	'
	COMPREHENSIVE INCOME
	The changes in Accumulated other comprehensive income (loss) by component, net of tax, are as follows (in thousands):
		Foreign currency				Unrealized gain (loss) on available-for-sale securities			Unrealized gain (loss) on derivative instruments			Other comprehensive gain (loss) on pension liability			Total
		(In thousands)
	Balance at December 31, 2012	$	(3,024	)		$	2,426		$	(10	)	$	(7,097	)	$	(7,705	)
	Other comprehensive income before reclassifications	8,482				(985		)	(67		)	2,500			9,930
	Amounts reclassified from Accumulated other comprehensive income (loss)	—				(203		)	2,929			—			2,726
	Net current period other comprehensive income	8,482				(1,188		)	2,862			2,500			12,656
	Balance at December 31, 2013	$	5,458			$	1,238		$	2,852		$	(4,597	)	$	4,951
	Income tax expense or benefit allocated to each component of other comprehensive income is not material.
	Reclassifications out of Accumulated other comprehensive income (loss) are as follows (in thousands):
			For the Twelve Months Ended December 31, 2013
			(In thousands)
	Details about Accumulated other comprehensive income (loss) components		Amount reclassified from Accumulated other comprehensive income (loss), net of tax				Affected line item in the Consolidated Statements of Income
	Unrealized net gain on available-for-sale securities		$	203			Other (expense) income, net
	Unrealized net losses on cash flow hedges		(2,929		)		Operating expenses *
			$	(2,726	)
	* Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2013
New Accounting Pronouncement or Change in Accounting Principle, Retrospective Adjustments [Abstract]	'
RECENT ACCOUNTING PRONOUNCEMENTS	'
	RECENT ACCOUNTING PRONOUNCEMENTS
	In July 2013, the Financial Accounting Standards Board issued an accounting standard update that provides explicit guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carry forward, a similar tax loss, or a tax credit carry forward exists. Under the new standard, the Company's unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carry forward, a similar tax loss, or a tax credit carry forward. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal year 2014 and applied prospectively. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Quarterly_Financial_Informatio

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	'
	CITRIX SYSTEMS, INC.
	SUPPLEMENTAL FINANCIAL INFORMATION
	QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
		First		Second		Third		Fourth		Total Year
		Quarter		Quarter		Quarter		Quarter
		(In thousands, except per share amounts)
	2013
	Net revenues	$	672,899	$	730,384	$	712,731	$	802,420	$	2,918,434
	Gross margin	557,985		603,144		588,798		665,712		2,415,639
	Income from operations	56,608		75,888		87,367		160,854		380,717
	Net income attributable to Citrix Systems, Inc.	59,688		64,461		76,730		138,644		339,523
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic	0.32		0.34		0.41		0.75		1.82
	Net income per share attributable to Citrix Systems, Inc. stockholders - diluted	0.32		0.34		0.41		0.74		1.8
		First		Second		Third		Fourth		Total Year
		Quarter		Quarter		Quarter		Quarter
		(In thousands, except per share amounts)
	2012
	Net revenues	$	589,495	$	615,210	$	641,422	$	739,996	$	2,586,123
	Gross margin	503,152		520,852		535,354		622,628		2,181,986
	Income from operations	80,750		82,192		82,415		145,421		390,778
	Net income attributable to Citrix Systems, Inc.	68,267		92,006		78,245		114,029		352,547
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic	0.37		0.49		0.42		0.61		1.89
	Net income per share attributable to Citrix Systems, Inc. stockholders - diluted	0.36		0.49		0.41		0.6		1.86
	The sum of the quarterly net income per share amounts do not add to the annual earnings per share amount due to the weighting of common and common equivalent shares outstanding during each of the respective periods.
	The Consolidated Statement of Cash Flows for the year ended December 31, 2013 reflects an adjustment of approximately $17.3 million made to the captions “Excess tax benefit from stock based compensation” and “Income taxes, net” for the three months ended March 31, 2013. Accordingly, the adjusted net cash provided by operating activities and net cash used in financing activities for the three months ended March 31, 2013 is approximately $266.6 million and $28.9 million, respectively.

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]	'
VALUATION AND QUALIFYING ACCOUNTS	'
	CITRIX SYSTEMS, INC.
	SCHEDULE II
	VALUATION AND QUALIFYING ACCOUNTS
			Beginning		Charged		Charged					Deductions				Balance
			of Period		to Costs and		to Other									at End
					Expenses		Accounts									of Period
			(In thousands)
	2013
	Deducted from asset accounts:
	Allowance for doubtful accounts		$	3,883	$	1,046	$	—				$	1,637	(2	)	$	3,292
	Allowance for returns		2,564		—		4,473			(1	)	4,975		(4	)	2,062
	Valuation allowance for deferred tax assets		18,185		—		8,280			(6	)	—				26,465
	2012
	Deducted from asset accounts:
	Allowance for doubtful accounts		$	2,564	$	1,784	$	1,119		(3	)	$	1,584	(2	)	$	3,883
	Allowance for returns		1,361		—		10,742			(1	)	9,539		(4	)	2,564
	Valuation allowance for deferred tax assets		9,235		—		8,950			(6	)	—				18,185
	2011
	Deducted from asset accounts:
	Allowance for doubtful accounts		$	3,409	$	266	$	1,468		(3	)	$	2,579	(2	)	$	2,564
	Allowance for returns		850		—		5,542			(1	)	5,031		(4	)	1,361
	Valuation allowance for deferred tax assets		13,999		—		(4,764		)	(5	)	—				9,235
	(1)	Charged against revenues.
	(2)	Uncollectible accounts written off, net of recoveries.
	(3)	Adjustments from acquisitions.
	(4)	Credits issued for returns.
	(5)	Related to deferred tax assets on unrealized losses and acquisitions.
	(6)	Related to deferred tax assets on foreign tax credits, net operating loss carryforwards, and depreciation.

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Consolidation Policy	'
	Consolidation Policy
	The consolidated financial statements of the Company include the accounts of its wholly-owned subsidiaries in the Americas, Europe, the Middle East and Africa (“EMEA”), Asia-Pacific and the SaaS division. All significant transactions and balances between the Company and its subsidiaries have been eliminated in consolidation.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash and cash equivalents at December 31, 2013 and 2012 include marketable securities, which are primarily money market funds, commercial paper, agency, and government securities, municipal securities and corporate securities with initial or remaining contractual maturities when purchased of three months or less.
Investments	'
	Investments
	Short-term and long-term investments at December 31, 2013 and 2012 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 income (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.
Accounts Receivable	'
	Accounts Receivable
	The Company’s accounts receivable are attributable primarily to VARs, VADs and end customers. Collateral is generally not required. The Company also maintains allowances for doubtful accounts for estimated losses resulting from the inability of the Company’s customers to make payments. The Company periodically reviews these estimated allowances, including by conducting an analysis of the customer's payment history and creditworthiness, the age of the trade receivable balances and current economic conditions that may affect a customer’s ability to make payments. Based on this review, the Company specifically reserves for those accounts deemed uncollectible. When receivables are determined to be uncollectible, principal amounts of such receivables outstanding are deducted from the allowance. The allowance for doubtful accounts was $3.3 million and $3.8 million as of December 31, 2013 and 2012, respectively. If the financial condition of a significant distributor or customer were to deteriorate, the Company’s operating results could be adversely affected. One distributor, Ingram Micro, accounted for 10% and 11% of gross accounts receivable at December 31, 2013 and 2012, respectively.
Inventory	'
	Inventory
	Inventories are stated at the lower of cost or market on a standard cost basis, which approximates actual cost. The Company’s inventories primarily consist of finished goods as of December 31, 2013 and 2012.
Property and Equipment	'
	Property and Equipment
	Property and equipment is stated at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which is generally three years for computer equipment and software, the lesser of the lease term or ten years for leasehold improvements, which is the estimated useful life, seven years for office equipment and furniture and the Company’s enterprise resource planning system and 40 years for buildings.
Long-Lived Assets	'
	Long-Lived Assets
	The Company reviews for impairment of long-lived assets and certain identifiable intangible assets to be held and used whenever events or changes in circumstances indicate that the carrying amount of such assets may not be fully recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition. Measurement of an impairment loss is based on the fair value of the asset compared to its carrying value. Long-lived assets and certain identifiable intangible assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell.
Goodwill	'
	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 tests analyses completed during the fourth quarters of 2013 and 2012, respectively. The authoritative guidance provides entities with an option to perform a qualitative assessment to determine whether further quantitative impairment testing is necessary. The Company performed the qualitative assessment when it performed its goodwill impairment test in the fourth quarter of 2013. As a result of the qualitative analysis, no further quantitative impairment test was deemed necessary. See Note 3 for acquisitions and Note 11 for segment information.
Intangible Assets	'
	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 recognized on a straight-line basis 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 accordance with the authoritative guidance, the Company records acquired product related intangible assets at net realizable value and reviews this technology for impairment on a periodic basis by comparing the estimated net realizable value to the unamortized cost of the technology. 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 purchased intangible asset and is amortized over the asset's estimated useful life.
	Intangible assets consist of the following (in thousands):
		December 31, 2013
		Gross Carrying		Accumulated		Weighted-Average Life (Years)
		Amount		Amortization
	Product related intangible assets	$	677,509	$	428,418	5.6
	Other	482,918		222,414		7.52
	Total	$	1,160,427	$	650,832	6.38
		December 31, 2012
		Gross Carrying		Accumulated		Weighted-Average Life (Years)
		Amount		Amortization
	Product related intangible assets	$	620,032	$	339,608	5.6
	Other	446,601		170,820		7.28
	Total	$	1,066,633	$	510,428	6.29
	Other intangible assets consist primarily of customer relationships, trade names, covenants not to compete and patents. Amortization of product related intangible assets includes amortization of product related technologies and patents and is reported as a Cost of net revenues in the accompanying consolidated statements of income. Amortization of other intangible assets includes amortization of customer relationships, trade names and covenants not to compete and is reported as an Operating expense in the accompanying consolidated statements of income. The Company monitors its intangible assets for indicators of impairment. If the Company determines an impairment has occurred, it will write-down the intangible asset to its fair value.
Software Development Costs	'
	Software Development Costs
	The authoritative guidance requires certain internal software development costs related to software to be sold to be capitalized upon the establishment of technological feasibility. The Company's software development costs incurred subsequent to achieving technological feasibility have not been significant and substantially all software development costs have been expensed as incurred.
Internal Use Software	'
	Internal Use Software
	In accordance with the authoritative guidance, the Company capitalizes external direct costs of materials and services and internal costs such as payroll and benefits of those employees directly associated with the development of new functionality in internal use software and software developed related to its software as a service (“SaaS”) offerings. The amount of costs capitalized in 2013 and 2012 relating to internal use software was $62.7 million and $51.5 million, respectively. These costs are being amortized over the estimated useful life of the software, which is generally three to seven years, and are included in property and equipment in the accompanying consolidated balance sheets. The total amounts charged to expense relating to internal use software was approximately $58.6 million, $44.5 million and $37.2 million, during the years ended December 31, 2013, 2012 and 2011, respectively.
Revenue Recognition	'
	Revenue Recognition
	Net revenues include the following categories: Product and licenses, Software as a service, 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 appliance products. These revenues are reflected net of sales allowances, cooperative advertising agreements, partner incentive programs and provisions for returns. Shipping charges billed to customers are included in Product and license revenue and the related shipping costs are included in Cost of product and license revenue. 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. The Company licenses many of its virtualization products bundled with a one-year contract for its Subscription Advantage program. 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 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 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 support with product version upgrades. 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 Company defines these four criteria as follows:
	•	Persuasive evidence of the arrangement exists. The Company primarily sells its software products via electronic licenses and typically requires a purchase order from the distributor, reseller or end-user (depending on the arrangement) who have previously negotiated a master distribution or resale agreement and an executed product license agreement from the end-user. For appliance sales, it is the Company’s customary practice to require a purchase order from distributors and resellers who have previously negotiated a master packaged product distribution or resale agreement. The Company typically recognizes revenue upon shipment for its appliance sales. For maintenance, technical support, product training and consulting services, the Company requires a purchase order and an executed agreement. For SaaS, the Company generally requires the customer or the reseller to electronically accept the terms of an online services agreement or execute a contract.
	•	Delivery has occurred and the Company has no remaining obligations. The Company considers delivery of licenses under electronic licensing agreements to have occurred when the related products are shipped and the end-user has been electronically provided the software activation keys that allow the end-user to take immediate possession of the product. For hardware appliance sales, the Company’s standard delivery method is free-on-board shipping point. Consequently, it considers delivery of appliances to have occurred when they are shipped pursuant to an agreement and purchase order. For SaaS, delivery occurs upon providing the users with their login id and password. For product training and consulting services, the Company fulfills its obligation when the services are performed. For license updates and maintenance, the Company assumes that its obligation is satisfied ratably over the respective terms of the agreements, which are typically 12 to 24 months. For SaaS, the Company assumes that its obligation is satisfied ratably over the respective terms of the agreements, which are typically 12 months.
	•	The fee is fixed or determinable. In the normal course of business, the Company does not provide customers the right to a refund of any portion of their license fees or extended payment terms. The fees are considered fixed or determinable upon establishment of an arrangement that contains the final terms of the sale including description, quantity and price of each product or service purchased. For SaaS, the fee is considered fixed or determinable if it is not subject to refund or adjustment.
	•	Collectability is probable. The Company determines collectability on a customer-by-customer basis and generally does not require collateral. The Company typically sells product licenses and license updates to distributors or resellers for whom there are histories of successful collection. New customers are typically subject to a credit review process that evaluates their financial position and ultimately their ability to pay. Customers are also subject to an ongoing credit review process. If the Company determines from the outset of an arrangement that collectability is not probable, revenue recognition is deferred until customer payment is received and the other parameters of revenue recognition described above have been achieved. Management’s judgment is required in assessing the probability of collection, which is generally based on an evaluation of customer specific information, historical experience and economic market conditions.
	The majority of the Company’s product and license revenue consists of revenue from the sale of stand-alone software products. Stand-alone 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.
	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 SaaS products are considered service arrangements per the authoritative guidance; accordingly, the Company follows the provisions of Securities and Exchange Commission Staff Accounting Bulletin (“SAB”) No. 104, Revenue Recognition, when accounting for these service arrangements. Generally, the Company’s SaaS products are sold separately and not bundled with the Enterprise and Service Provider division’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 consolidated financial statements and have historically been within management’s expectations. Allowances for estimated product returns amounted to approximately $2.1 million and $2.6 million at December 31, 2013 and December 31, 2012, 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.
Product Concentration	'
	Product Concentration
	The Company derives a substantial portion of its revenues from its Mobile and Desktop products, which include its XenDesktop and XenApp products and related services, and anticipates that these products and future derivative products and product lines based upon this technology will continue to constitute a majority of its revenue. The Company could experience declines in demand for its Mobile and Desktop products and other products, whether as a result of general economic conditions, the delay or reduction in technology purchases, new competitive product releases, price competition, lack of success of its strategic partners, technological change or other factors.
Cost of Net Revenues	'
	Cost of Net Revenues
	Cost of product and license revenues consists primarily of hardware, product media and duplication, manuals, packaging materials, shipping expense, server capacity costs. In addition, the Company is a party to licensing agreements with various entities, which give the Company the right to use certain software code in its products or in the development of future products in exchange for the payment of fixed fees or amounts based upon the sales of the related product. The licensing agreements generally have terms ranging from one to five years, and generally include renewal options. However, some agreements are perpetual unless expressly terminated. Royalties and other costs related to these agreements are included in cost of net revenues. Cost of services and maintenance revenue consists primarily of compensation and other personnel-related costs of providing technical support and consulting, as well as the Company’s SaaS. Also included in cost of net revenues is amortization of product related intangible assets which includes acquired core and product technology and associated patents.
Foreign Currency	'
	Foreign Currency
	The functional currency for all of the Company’s wholly-owned foreign subsidiaries in its Enterprise and Service Provider division 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. The functional currency of the Company’s wholly-owned foreign subsidiaries of its SaaS division is the currency of the country in which each subsidiary is located. The Company translates assets and liabilities of these foreign subsidiaries at exchange rates in effect at the balance sheet date. The Company includes accumulated net translation adjustments in equity as a component of Accumulated other comprehensive income (loss). 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. Remeasurement and foreign currency transaction (losses) gains of approximately $(4.9) million, $(3.3) million and $4.7 million for the years ended December 31, 2013, 2012, and 2011, respectively, are included in Other (expense) income, net, in the accompanying consolidated statements of income.
Derivatives and Hedging Activities	'
	Derivatives and Hedging Activities
	In accordance with the authoritative guidance, the Company records derivatives at fair value as either assets or liabilities on the balance sheet. For derivatives that are designated as and qualify as effective cash flow hedges, the portion of gain or loss on the derivative instrument effective at offsetting changes in the hedged item is reported as a component of Accumulated other comprehensive income (loss) and reclassified into earnings as operating expense, net, when the hedged transaction affects earnings. Derivatives not designated as hedging instruments are adjusted to fair value through earnings as Other (expense) income, net, in the period during which changes in fair value occur. The application of the authoritative guidance could impact the volatility of earnings.
	The Company formally documents all relationships between hedging instruments and hedged items, as well as its risk-management objective and strategy for undertaking various hedge transactions. This process includes attributing all derivatives that are designated as cash flow hedges to floating rate assets or liabilities or forecasted transactions. The Company also formally assesses, both at the inception of the hedge and on an ongoing basis, whether each derivative is highly effective in offsetting changes in cash flows of the hedged item. Fluctuations in the value of the derivative instruments are generally offset by changes in the hedged item; however, if it is determined that a derivative is not highly effective as a hedge or if a derivative ceases to be a highly effective hedge, the Company will discontinue hedge accounting prospectively for the affected derivative.
	The Company is exposed to risk of default by its hedging counterparties. Although this risk is concentrated among a limited number of counterparties, the Company’s foreign exchange hedging policy attempts to minimize this risk by placing limits on the amount of exposure that may exist with any single financial institution at a time.
Pension Liability	'
	Pension Liability
	The Company provides retirement benefits to certain employees who are not U.S. based. Generally, benefits under these programs are based on an employee’s length of service and level of compensation. The majority of these programs are commonly referred to as termination indemnities, which provide retirement benefits in accordance with programs mandated by the governments of the countries in which such employees work.
	The Company had accrued $9.2 million and $9.8 million for these pension liabilities at December 31, 2013 and 2012, respectively. Expenses for the programs for 2013, 2012 and 2011 amounted to $3.5 million, $1.5 million and $1.8 million, respectively.
Advertising Costs	'
	Advertising Costs
	The Company expenses advertising costs as incurred. The Company has advertising agreements with, and purchases advertising from, online media providers to advertise its SaaS. The Company also has cooperative advertising agreements with certain distributors and resellers whereby the Company will reimburse distributors and resellers for qualified advertising of Company products. Reimbursement is made once the distributor, reseller or provider provides substantiation of qualified expenses. The Company estimates the impact of these expenses and recognizes them at the time of product sales as a reduction of net revenue in the accompanying consolidated statements of income. The total costs the Company recognized related to advertising were approximately $146.5 million, $137.5 million and $130.8 million, during the years ended December 31, 2013, 2012 and 2011, respectively.
Income Taxes	'
	Income Taxes
	The Company and one or more of its subsidiaries is subject to United States federal income taxes, 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 2009.
	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, 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.
	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 consolidated financial statements. 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.
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 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 provision for vacant facility costs, 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 consolidated financial position and results of operations taken as a whole, the actual amounts of such items, when known, will vary from these estimates.
Accounting for Stock-Based Compensation	'
	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 consolidated financial statements using a fair value method. See Note 7 for further information regarding the Company’s stock-based compensation plans.
Net Income Per Share Attributable to Citrix Systems, Inc. Stockholders'	'
	Net Income Per Share Attributable to Citrix Systems, Inc. Stockholders
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic is calculated by dividing income available to stockholders by the weighted-average number of common shares outstanding during each period. Net income per share attributable to Citrix Systems, Inc. stockholders - diluted 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 vesting or exercise of stock awards (calculated using the treasury stock method) during the period they were outstanding. Certain shares under the Company’s stock-based compensation programs were excluded from the computation of diluted earnings per share due to their anti-dilutive effect for the respective periods in which they were outstanding. The reconciliation of the numerator and denominator of the earnings per share calculation is presented in Note 13.
Reclassifications	'
	Reclassifications
	Certain reclassifications of the prior years' amounts have been made to conform to the current year's presentation. In the Property and Equipment table above, the Company determined it was more practical to present Assets under construction on a separate line as opposed to including the amounts within each asset class. Therefore, the reclassifications only resulted in changes to the amounts between asset classes.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Schedule of Property and Equipment	'
	Property and equipment consist of the following:
			December 31,
			2013				2012
			(In thousands)
	Buildings		$	85,092			$	76,202
	Computer equipment		204,110				178,948
	Software		316,902				259,225
	Equipment and furniture		105,145				86,362
	Leasehold improvements		168,990				149,731
			880,239				750,468
	Less accumulated depreciation and amortization		(597,268		)		(479,460		)
	Assets under construction		28,438				15,517
	Land		27,587				16,769
	Total		$	338,996			$	303,294
Schedule of Changes in Goodwill	'
	The following table presents the change in goodwill allocated to the Company’s reportable segments during 2013 and 2012 (in thousands):
		Balance at January 1, 2013				Additions				Other				Balance at December 31, 2013		Balance at January 1, 2012		Additions			Other				Balance at December 31, 2012
	Enterprise and Service Provider division	$	1,158,580			$	248,800			$	(5,224	)	-2	$	1,402,156	$	956,504	$	257,379		$	(55,303	)	-4	$	1,158,580
	SaaS division	359,639				2,668				4,486			-3	366,793		282,616		26,481			50,542			-4	359,639
	Consolidated	$	1,518,219			$	251,468		-1	$	(738	)		$	1,768,949	$	1,239,120	$	283,860	-1	$	(4,761	)		$	1,518,219
	(1)	Amount primarily relates to acquisitions. See Note 3 for more information regarding the Company’s acquisitions.
	(2)	Amount primarily relates to adjustments to the preliminary purchase price allocation for certain 2012 Acquisitions.
	(3)
Schedule of Intangible Assets	'
	Intangible assets consist of the following (in thousands):
		December 31, 2013
		Gross Carrying				Accumulated				Weighted-Average Life (Years)
		Amount				Amortization
	Product related intangible assets	$	677,509			$	428,418			5.6
	Other	482,918				222,414				7.52
	Total	$	1,160,427			$	650,832			6.38
		December 31, 2012
		Gross Carrying				Accumulated				Weighted-Average Life (Years)
		Amount				Amortization
	Product related intangible assets	$	620,032			$	339,608			5.6
	Other	446,601				170,820				7.28
	Total	$	1,066,633			$	510,428			6.29
Schedule of Estimated Future Annual Amortization Expense of Intangible Assets	'
	Estimated future annual amortization expense is as follows (in thousands):
	Year ending December 31,
	2014	$	132,956
	2015	111,016
	2016	88,749
	2017	61,057
	2018	47,618

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combination, Description [Abstract]	'
Schedule of Allocation of Total Purchase Prices	'
	The allocation of the total purchase prices are summarized below (in thousands):
		Zenprise					2013 Other Acquisitions
		Purchase Price Allocation			Asset Life		Purchase Price Allocation			Asset Life
	Current assets	$	10,943				$	3,586
	Other assets	668					—
	Property and equipment	431			Various		—
	Deferred tax assets, non-current	38,785					3,177
	Intangible assets	69,200			1-7 years		11,300			5-6 years
	Goodwill	247,273			Indefinite		4,195			Indefinite
	Assets acquired	367,300					22,258
	Current liabilities assumed	(8,475		)			(3,950		)
	Deferred tax liabilities, current	—					(2,000		)
	Long-term liabilities assumed	(3,107		)			(1,000		)
	Deferred tax liabilities, non-current	(28,725		)			(1,699		)
	Net assets acquired	$	326,993				$	13,609
	The purchase price for ByteMobile was allocated to the acquired net tangible and intangible assets based on its estimated fair value as of the date of the acquisition. The allocation of the total purchase price is summarized below (in thousands):
		ByteMobile
		Purchase Price Allocation			Asset Life
	Current assets	$	57,796
	Other assets	7,406
	Property and equipment	2,484			Various
	Deferred tax assets, non-current	44,934
	Intangible assets	248,900			1-9 years
	Goodwill	221,914			Indefinite
	Assets acquired	583,434
	Current liabilities assumed	(62,313		)
	Long-term liabilities assumed	(4,083		)
	Deferred tax liabilities, non-current	(111,904		)
	Net assets acquired	$	405,134
Schedule of Identifiable Intangible Assets Acquired in Connection with the 2013 Acquisitions	'
	Identifiable intangible assets acquired in connection with the 2013 Acquisitions (in thousands) and the weighted-average lives are as follows:
		Zenprise			Asset Life		2013 Other Acquisitions			Asset Life
	Trade names	$	2,400		3.0 years		$	—
	Non-compete agreements	700			1.0 year		—
	Customer relationships	18,300			7.0 years		3,600			6.0 years
	Core and product technologies	47,800			6.0 years		6,300			5.0 years
	In-process R&D (1)	—					1,400			Indefinite
	Total	$	69,200				$	11,300
Schedule of Pro Forma Information	'
	The following unaudited pro-forma information combines the consolidated results of the operations of the Company and the 2013 Acquisitions as if the acquisitions had occurred at the beginning of fiscal year 2012 (in thousands, except per share data):
		Year Ended December 31,
		2013			2012
	Revenues	$	2,921,604		$	2,596,227
	Income from operations	376,936			333,077
	Net income	336,250			314,300
	Per share - basic	1.8			1.68
	Per share - diluted	1.79			1.66

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments [Abstract]	'
Schedule Of Available-For-Sale Securities	'
	Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):
		December 31, 2013									December 31, 2012
	Description of the Securities	Amortized		Gross		Gross			Fair Value		Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized					Cost		Unrealized		Unrealized
				Gains		Losses							Gains		Losses
	Agency securities	$	453,922	$	1,177	$	(349	)	$	454,750	$	400,365	$	2,347	$	(5	)	$	402,707
	Corporate securities	643,360		947		(216		)	644,091		404,546		947		(171		)	405,322
	Municipal securities	53,698		81		(23		)	53,756		32,214		114		(15		)	32,313
	Government securities	156,930		196		(47		)	157,079		39,863		131		(1		)	39,993
	Total	$	1,307,910	$	2,401	$	(635	)	$	1,309,676	$	876,988	$	3,539	$	(192	)	$	880,335

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
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 December 31, 2013			Quoted		Significant		Significant
					Prices In		Other		Unobservable
					Active Markets		Observable		Inputs (Level 3)
					for Identical		Inputs (Level 2)
					Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	227,528		$	227,528	$	—	$	—
	Money market funds	52,823			52,823		—		—
	Corporate securities	389			—		389		—
	Available-for-sale securities:
	Agency securities	454,750			—		454,750		—
	Corporate securities	644,091			—		633,801		10,291
	Municipal securities	53,756			—		53,756		—
	Government securities	157,079			—		157,079		—
	Prepaid expenses and other current assets:
	Foreign currency derivatives	4,952			—		4,952		—
	Total assets	$	1,595,368		$	280,351	$	1,304,727	$	10,291
	Accrued expenses and other current liabilities:
	Foreign currency derivatives	1,743			—		1,743		—
	Total liabilities	$	1,743		$	—	$	1,743	$	—
		As of December 31, 2012			Quoted		Significant		Significant
					Prices In		Other		Unobservable
					Active Markets		Observable		Inputs (Level 3)
					for Identical		Inputs (Level 2)
					Assets (Level 1)
		(in thousands)
	Assets:
	Cash and cash equivalents:
	Cash	$	503,614		$	503,614	$	—	$	—
	Money market funds	123,519			123,519		—		—
	Corporate securities	16,476			—		16,476		—
	Available-for-sale securities:
	Agency securities	402,707			—		402,707		—
	Corporate securities	405,322			—		401,981		3,341
	Municipal securities	32,313			—		32,313		—
	Government securities	39,993			—		39,993		—
	Prepaid expenses and other current assets:
	Foreign currency derivatives	4,157			—		4,157		—
	Total assets	$	1,528,101		$	627,133	$	897,627	$	3,341
	Accrued expenses and other current liabilities:
	Foreign currency derivatives	4,162			—		4,162		—
	Total liabilities	$	4,162		$	—	$	4,162	$	—
Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs	'
		Investments
		(in thousands)
	Balance at December 31, 2012	$	3,341
	Purchases of Level 3 securities	9,700
	Transfers out of Level 3	(2,750		)
	Balance at December 31, 2013	$	10,291

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]	'
Schedule of Accrued Expenses and Other Current Liabilities	'
	Accrued expenses consist of the following:
		December 31,
		2013		2012
		(In thousands)
	Accrued compensation and employee benefits	$	141,065	$	130,835
	Other accrued expenses	116,541		126,300
	Total	$	257,606	$	257,135

Employee_StockBased_Compensati1

Employee Stock-Based Compensation and Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Detail Of The 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):
	Income Statement Classifications	2013				2012		2011
	Cost of services revenues	$	2,540			$	2,111	$	1,584
	Research and development	63,448				54,616		31,763
	Sales, marketing and services	65,549				51,519		31,354
	General and administrative	52,404				41,694		28,208
	Total	$	183,941			$	149,940	$	92,909
Schedule of Stock Option Activity	'
	A summary of the status and activity of the Company’s fixed option awards is as follows:
	Options		Number of			Weighted-		Weighted-		Aggregate
			Options			Average		Average		Intrinsic
						Exercise		Remaining		Value
						Price		Contractual		(in thousands)
								Life
								(in years)
	Outstanding at December 31, 2012		7,589,532			$	54.15	2.7
	Assumed		285,817			11.85
	Exercised		(2,168,531	)		33.97
	Forfeited or expired		(299,841	)		60.9
	Outstanding at December 31, 2013		5,406,977			59.64		2.15		$	57,583
	Vested or expected to vest		5,366,212			59.78		2.14		$	56,548
	Exercisable at December 31, 2013		4,438,465			61.88		1.93		$	38,167
Assumptions Used To Value Option Grants	'
	The assumptions used to value options granted and/or assumed are as follows:
		Stock options granted or assumed during
		2013		2012		2011
	Expected volatility factor	0.39		0.38 - 0.43		0.38 - 0.50
	Approximate risk free interest rate	0.40%		0.5% - 0.7%		0.6% - 1.1%
	Expected term (in years)	3.35		3.91		3.27 - 3.91
	Expected dividend yield	0%		0%		0%
	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 2013 Grant		March 2012 Grant
	Expected volatility factor	0.16 - 0.42		0.21 - 0.39
	Risk free interest rate	0.33	%	0.47	%
	Expected dividend yield	0	%	0	%
Schedule of Nonvested Stock Unit Activity	'
	The following table summarizes the Company's non-vested stock unit activity for the year ended December 31, 2013:
			Number of			Weighted-
			Shares			Average
						Fair Value
						at Grant Date
	Non-vested stock units at December 31, 2012		3,607,561			$	74.7
	Granted		2,765,386			71.84
	Vested		(1,375,165	)		69.36
	Forfeited		(365,803	)		76.16
	Non-vested stock units at December 31, 2013		4,631,979			74.47

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Lease Commitments	'
	Lease commitments under non-cancelable operating leases with initial or remaining terms in excess of one year and sublease income associated with non-cancelable subleases, are as follows:
		Operating		Sublease
		Leases		Income
		(In thousands)
	Years ending December 31,
	2014	$	60,982	$	255
	2015	46,770		260
	2016	39,353		227
	2017	22,064		218
	2018	18,536		203
	Thereafter	88,885		—
	Total	$	276,590	$	1,163

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
United States and Foreign Components of Income Before Income Taxes	'
	The United States and foreign components of income before income taxes are as follows:
			2013				2012				2011
			(In thousands)
	United States		$	142,085			$	200,802			$	176,824
	Foreign		245,805				209,427				253,673
	Total		$	387,890			$	410,229			$	430,497
Components of the Provision for Income Taxes	'
	The components of the provision for income taxes are as follows:
			2013				2012				2011
			(In thousands)
	Current:
	Federal		$	51,389			$	81,019			$	50,022
	Foreign		37,221				30,059				29,169
	State		11,605				17,395				11,905
	Total current		100,215				128,473				91,096
	Deferred:
	Federal		(34,897		)		(64,960		)		(8,631		)
	Foreign		(8,413		)		1,409				(4,792		)
	State		(8,538		)		(7,240		)		(2,806		)
	Total deferred		(51,848		)		(70,791		)		(16,229		)
	Total provision		$	48,367			$	57,682			$	74,867
Components of Deferred Tax Assets and Liabilities	'
	The significant components of the Company’s deferred tax assets and liabilities consisted of the following:
			December 31,
			2013				2012
			(In thousands)
	Deferred tax assets:
	Accruals and reserves		$	25,556			$	36,128
	Deferred revenue		55,688				41,820
	Tax credits		60,519				43,657
	Net operating losses		103,329				89,856
	Other		10,537				8,452
	Stock based compensation		72,074				54,852
	Depreciation and amortization		1,675				—
	Valuation allowance		(26,465		)		(18,185		)
	Total deferred tax assets		302,913				256,580
	Deferred tax liabilities:
	Depreciation and amortization		—				(40,159		)
	Acquired technology		(136,258		)		(140,017		)
	Prepaid expenses		(16,258		)		(17,093		)
	Total deferred tax liabilities		(152,516		)		(197,269		)
	Total net deferred tax assets		$	150,397			$	59,311
	The following table presents the breakdown between current and non-current net deferred tax assets:
			December 31,
			2013				2012
			(In thousands)
	Deferred tax assets - current		$	48,470			$	36,846
	Deferred tax liabilities - current		(364		)		(876		)
	Deferred tax assets- non current		115,418				43,097
	Deferred tax liabilities - non current		(13,127		)		(19,756		)
	Total net deferred tax assets		$	150,397			$	59,311
Reconciliation of The Company's Effective Tax Rate to The Statutory Federal Rate	'
	A reconciliation of the Company’s effective tax rate to the statutory federal rate is as follows:
			Year Ended December 31,
			2013			2012			2011
	Federal statutory taxes		35	%		35	%		35	%
	State income taxes, net of federal tax benefit		1.2			1.9			1.7
	Foreign operations		(14.8	)		(10.2	)		(14.5	)
	Permanent differences		(1.1	)		(2.0	)		1.2
	Tax credits		(10.9	)		(4.7	)		(7.1	)
	Stock option compensation		0.4			0.1			0.1
	Change in accruals for uncertain tax positions		3.3			(5.3	)		1.4
	Other		(0.6	)		(0.7	)		(0.4	)
			12.5	%		14.1	%		17.4	%
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2013 and 2012 is as follows (in thousands):
	Balance at January 1, 2012	$	79,199
	Additions based on tax positions related to the current year	2,459
	Additions for tax positions of prior years	9,558
	Reductions related to the expiration of statutes of limitations	(33,594		)
	Settlements	(13,718		)
	Balance at December 31, 2012	43,904
	Additions based on tax positions related to the current year	13,694
	Additions for tax positions of prior years	10,611
	Reductions related to the expiration of statutes of limitations	(2,116		)
	Settlements	(2,301		)
	Balance at December 31, 2013	$	63,792

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Net Revenues And Profit By Segment	'
	Net revenues and segment profit for 2013, 2012 and 2011 classified by the Company’s reportable segments, are presented below:
		2013			2012			2011
		(In thousands)
	Net revenues:
	Enterprise and Service Provider division	$	2,335,562		$	2,074,800		$	1,778,646
	SaaS division	582,872			511,323			427,746
	Consolidated	$	2,918,434		$	2,586,123		$	2,206,392
	Segment profit:
	Enterprise and Services Provider division	$	588,138		$	562,794		$	504,883
	SaaS division	116,061			92,498			76,147
	Unallocated expenses (1):
	Amortization of intangible assets	(139,541		)	(114,574		)	(71,131		)
	Restructuring	—			—			(24		)
	Net interest and other income	7,173			19,451			13,531
	Stock-based compensation	(183,941		)	(149,940		)	(92,909		)
	Consolidated income before income taxes	$	387,890		$	410,229		$	430,497
	(1)	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.
Identifiable Assets By Segment	'
		December 31,
		2013			2012
		(In thousands)
	Identifiable assets:
	Enterprise and Service Provider division	$	4,662,724		$	4,246,292
	SaaS division	549,525			550,110
	Total identifiable assets	$	5,212,249		$	4,796,402
Identifiable and Long-Lived Assets by Product Grouping and Countries	'
		December 31,
		2013			2012
		(In thousands)
	Long-lived assets, net:
	United States	$	258,114		$	231,812
	United Kingdom	29,382			30,633
	Other countries	51,500			40,849
	Total long-lived assets, net	$	338,996		$	303,294
Revenues By Product Grouping	'
	Revenues by product grouping for the Company’s Enterprise and Service Provider division and SaaS division were as follows for the years ended:
		December 31,
		2013			2012			2011
		(In thousands)
	Net revenues:
	Enterprise and Service Provider division
	Mobile and Desktop revenues(1)	$	1,549,383		$	1,450,850		$	1,278,798
	Networking and Cloud revenues(2)	634,598			496,608			385,518
	Professional services(3)	138,879			119,061			91,496
	Other	12,702			8,281			22,834
	Total Enterprise and Service Provider division revenues	2,335,562			2,074,800			1,778,646
	SaaS division revenues	582,872			511,323			427,746
	Total net revenues	$	2,918,434		$	2,586,123		$	2,206,392
	-1	Mobile and Desktop revenues are primarily comprised of sales from the Company’s desktop and application virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.
	-2	Networking and Cloud revenues are primarily comprised of sales from the Company’s cloud networking products, which include NetScaler, CloudBridge and ByteMobile Smart Capacity, and the Company’s cloud platform products which include XenServer, CloudPlatform and CloudPortal and related license updates and maintenance and support.
	-3	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 years ended:
		December 31,
		2013			2012			2011
		(In thousands)
	Net revenues:
	Enterprise and Service Provider division
	Americas	$	1,263,673		$	1,106,801		$	993,062
	EMEA	785,862			691,111			576,953
	Asia-Pacific	286,027			276,888			208,631
	Total Enterprise and Service Provider division revenues	2,335,562			2,074,800			1,778,646
	SaaS division
	Americas	488,307			433,263			367,260
	EMEA	73,529			63,484			50,711
	Asia-Pacific	21,036			14,576			9,775
	Total SaaS division revenues	582,872			511,323			427,746
	Total net revenues	$	2,918,434		$	2,586,123		$	2,206,392

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2013

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)

December 31, 2013

December 31, 2012

December 31, 2013

December 31, 2012

Derivatives Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$4,559

Prepaid

$4,157

Accrued

$1,578

Accrued

$4,162

expenses

expenses

expenses

expenses

and other

and other

and other

and other

current

current

current

current

assets

assets

liabilities

liabilities

Asset Derivatives

Liability Derivatives

(In thousands)

December 31, 2013

December 31, 2012

December 31, 2013

December 31, 2012

Derivatives Not Designated as

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Balance Sheet

Fair

Hedging Instruments

Location

Value

Location

Value

Location

Value

Location

Value

Foreign currency forward contracts

Prepaid

$393

Prepaid

$448

Accrued

$165

Accrued

$52

expenses

expenses

expenses

expenses

and other

and other

and other

and other

current

current

current

current

assets

assets

liabilities

liabilities

Schedule of Effect of Derivative Instruments on Financial Performance

'

The Effect of Derivative Instruments on Financial Performance

For the Year ended December 31,

(In thousands)

Derivatives in Cash Flow

Amount of Gain Recognized in Other

Location of Loss Reclassified

Amount of Loss Reclassified from

Hedging Relationships

Comprehensive Income (Loss)

from Accumulated Other

Accumulated Other

(Effective Portion)

Comprehensive Income (Loss) into Income

Comprehensive Income (Loss)

(Effective Portion)

(Effective Portion)

2013

2012

2013

2012

Foreign currency forward contracts

$

2,862

$

5,164

Operating expenses

$

(2,929

)

$

(5,817

)

For the Year ended December 31,

(In thousands)

Derivatives Not Designated as Hedging Instruments

Location of Gain (Loss) Recognized in Income on

Amount of Gain (Loss) Recognized in Income on Derivative

Derivative

2013

2012

Foreign currency forward contracts

Other (expense) income, net

$

3,138

$

(1,341

)

Currency Forward Contracts Outstanding

'

As of December 31, 2013, the Company had the following net notional foreign currency forward contracts outstanding (in thousands):

Foreign Currency

Currency

Denomination

Australian dollars

AUD 8,012

British pounds sterling

GBP 34,475

Canadian dollars

CAD 6,714

Chinese renminbi

CNY 81,250

Danish krone

DKK 1,500

Euro

EUR 27,820

Hong Kong dollars

HKD 51,063

Indian rupees

INR 1,201,622

Japanese yen

JPY 169,004

New Zealand dollars

NZD 300

Singapore dollars

SGD 12,600

Swiss francs

CHF 19,741

Net_Income_Per_Share_Attributa1

Net Income Per Share Attributable To Citrix Systems, Inc. Stockholders (Tables)	12 Months Ended
	Dec. 31, 2013
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 attributable to Citrix Systems, Inc. stockholders (in thousands, except per share information):
		Year Ended December 31,
		2013		2012		2011
	Numerator:
	Net income attributable to Citrix Systems, Inc. stockholders	$	339,523	$	352,547	$	356,322
	Denominator:
	Denominator for basic earnings per share - weighted-average shares outstanding	186,672		186,722		187,315
	Effect of dilutive employee stock awards:
	Employee stock awards	1,573		2,407		3,326
	Denominator for diluted earnings per share - weighted-average shares outstanding	188,245		189,129		190,641
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic	$	1.82	$	1.89	$	1.9
	Net income per share attributable to Citrix Systems, Inc. stockholders - diluted	$	1.8	$	1.86	$	1.87
	Anti-dilutive weighted-average shares	3,647		3,464		2,576

Comprehensive_Income_Tables

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Schedule of Changes in Accumulated Other Comprehensive Income by Component	'
	The changes in Accumulated other comprehensive income (loss) by component, net of tax, are as follows (in thousands):
		Foreign currency				Unrealized gain (loss) on available-for-sale securities			Unrealized gain (loss) on derivative instruments			Other comprehensive gain (loss) on pension liability			Total
		(In thousands)
	Balance at December 31, 2012	$	(3,024	)		$	2,426		$	(10	)	$	(7,097	)	$	(7,705	)
	Other comprehensive income before reclassifications	8,482				(985		)	(67		)	2,500			9,930
	Amounts reclassified from Accumulated other comprehensive income (loss)	—				(203		)	2,929			—			2,726
	Net current period other comprehensive income	8,482				(1,188		)	2,862			2,500			12,656
	Balance at December 31, 2013	$	5,458			$	1,238		$	2,852		$	(4,597	)	$	4,951
Schedule of Reclassification out of Accumulated Other Comprehensive Income	'
	Reclassifications out of Accumulated other comprehensive income (loss) are as follows (in thousands):
			For the Twelve Months Ended December 31, 2013
			(In thousands)
	Details about Accumulated other comprehensive income (loss) components		Amount reclassified from Accumulated other comprehensive income (loss), net of tax				Affected line item in the Consolidated Statements of Income
	Unrealized net gain on available-for-sale securities		$	203			Other (expense) income, net
	Unrealized net losses on cash flow hedges		(2,929		)		Operating expenses *
			$	(2,726	)
	* Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Quarterly_Financial_Informatio1

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
Schedule of quarterly financial information (unaudited)	'
		First		Second		Third		Fourth		Total Year
		Quarter		Quarter		Quarter		Quarter
		(In thousands, except per share amounts)
	2013
	Net revenues	$	672,899	$	730,384	$	712,731	$	802,420	$	2,918,434
	Gross margin	557,985		603,144		588,798		665,712		2,415,639
	Income from operations	56,608		75,888		87,367		160,854		380,717
	Net income attributable to Citrix Systems, Inc.	59,688		64,461		76,730		138,644		339,523
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic	0.32		0.34		0.41		0.75		1.82
	Net income per share attributable to Citrix Systems, Inc. stockholders - diluted	0.32		0.34		0.41		0.74		1.8
		First		Second		Third		Fourth		Total Year
		Quarter		Quarter		Quarter		Quarter
		(In thousands, except per share amounts)
	2012
	Net revenues	$	589,495	$	615,210	$	641,422	$	739,996	$	2,586,123
	Gross margin	503,152		520,852		535,354		622,628		2,181,986
	Income from operations	80,750		82,192		82,415		145,421		390,778
	Net income attributable to Citrix Systems, Inc.	68,267		92,006		78,245		114,029		352,547
	Net income per share attributable to Citrix Systems, Inc. stockholders - basic	0.37		0.49		0.42		0.61		1.89
	Net income per share attributable to Citrix Systems, Inc. stockholders - diluted	0.36		0.49		0.41		0.6		1.86

Significant_Accounting_Policie3

Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Accounting Policies [Line Items]	'	'	'
Allowance for doubtful accounts	$3,300,000	$3,800,000	'
Estimated useful lives of intangible assets	'6 years 4 months 18 days	'6 years 3 months 15 days	'
Amount capitalized related to internal use software	62,700,000	51,500,000	'
Amount expensed related to internal use software	58,600,000	44,500,000	37,200,000
Valuation Allowances and Reserves, Balance	2,100,000	2,600,000	'
Licensing agreement with subscription bundle, term	'1 year	'	'
Remeasurement and foreign currency transaction gains (losses)	-4,900,000	-3,300,000	4,700,000
Advertising costs	146,500,000	137,500,000	130,800,000
Foreign postretirement benefit plans	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Termination indemnities	9,200,000	9,800,000	'
Termination indemnities, compensation expense	$3,500,000	$1,500,000	$1,800,000
Online service agreements	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Revenue recognition, period for recognition	'12 months	'	'
Minimum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives of intangible assets	'3 years	'	'
Licensing agreement term	'1 year	'	'
Minimum | License update	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Revenue recognition, period for recognition	'12 months	'	'
Maximum	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives of intangible assets	'7 years	'	'
Licensing agreement term	'5 years	'	'
Maximum | License update	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Revenue recognition, period for recognition	'24 months	'	'
Weighted average | Online service agreements	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Revenue recognition, period for recognition	'12 months	'	'
Customer concentration risk | Accounts receivable | Ingram Micro	'	'	'
Significant Accounting Policies [Line Items]	'	'	'
Number of customers meeting concentration risk threshold	1	1	'
Concentration risk percentage	10.00%	11.00%	'

Significant_Accounting_Policie4

Significant Accounting Policies (Property and Equipment) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]	'	'
Total property and equipment, net	$338,996,000	$303,294,000
Retirement of property and equipment	10,300,000	5,300,000
Buildings	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	85,092,000	76,202,000
Estimated useful lives of property and equipment	'40 years	'
Computer equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	204,110,000	178,948,000
Estimated useful lives of property and equipment	'3 years	'
Software	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	316,902,000	259,225,000
Estimated useful lives of property and equipment	'3 years	'
Equipment and furniture	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	105,145,000	86,362,000
Estimated useful lives of property and equipment	'7 years	'
Leasehold improvements	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	168,990,000	149,731,000
Leasehold improvements | Maximum	'	'
Property, Plant and Equipment [Line Items]	'	'
Estimated useful lives of property and equipment	'10 years	'
Depreciable assets	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	880,239,000	750,468,000
Less accumulated depreciation and amortization	-597,268,000	-479,460,000
Assets under construction	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	28,438,000	15,517,000
Land	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$27,587,000	$16,769,000

Significant_Accounting_Policie5

Significant Accounting Policies (Changes in Goodwill) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Goodwill [Roll Forward]	'		'
Beginning balance	$1,518,219,000		$1,239,120,000
Additions	251,468,000	[1]	283,860,000	[1]
Other	-738,000		-4,761,000
Ending balance	1,768,949,000		1,518,219,000
Enterprise and Service Provider division	'		'
Goodwill [Roll Forward]	'		'
Beginning balance	1,158,580,000		956,504,000
Additions	248,800,000		257,379,000
Other	-5,224,000	[2]	-55,303,000	[3]
Ending balance	1,402,156,000		1,158,580,000
SaaS division	'		'
Goodwill [Roll Forward]	'		'
Beginning balance	359,639,000		282,616,000
Additions	2,668,000		26,481,000
Other	4,486,000	[4]	50,542,000	[3]
Ending balance	366,793,000		359,639,000
ByteMobile	'		'
Goodwill [Roll Forward]	'		'
Ending balance	221,914,000		'
Purchase accounting adjustments	$3,300,000		'
[1]	Amount primarily relates to acquisitions. See Note 3 for more information regarding the Companybs acquisitions.
[2]	Amount primarily relates to adjustments to the preliminary purchase price allocation for certain 2012 Acquisitions.
[3]	Amount primarily relates to reclassification of goodwill between segments. In the first quarter of 2012, the Company transferred the business acquired in its acquisition of Novell Labs, Inc. (d/b/a "ShareFile") from its Enterprise and Service Provider division to its SaaS division. Also included in the SaaS division is foreign currency translation.
[4]	Amount primarily relates to foreign currency translation.

Significant_Accounting_Policie6

Significant Accounting Policies (Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$1,160,427,000	$1,066,633,000
Accumulated Amortization	650,832,000	510,428,000
Weighted-Average Life (Years)	'6 years 4 months 18 days	'6 years 3 months 15 days
Impairment of intangible assets	0	'
Product related intangible assets	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	677,509,000	620,032,000
Accumulated Amortization	428,418,000	339,608,000
Weighted-Average Life (Years)	'5 years 7 months 6 days	'5 years 7 months 6 days
Other	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	482,918,000	446,601,000
Accumulated Amortization	222,414,000	170,820,000
Weighted-Average Life (Years)	'7 years 6 months 8 days	'7 years 3 months 11 days
Patents	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted-Average Life (Years)	'10 years	'
Trade names | Cloud.com	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Impairment of intangible assets	'	5,200,000
Net carrying amount after write-down	'	$0
Minimum	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted-Average Life (Years)	'3 years	'
Maximum	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Weighted-Average Life (Years)	'7 years	'

Significant_Accounting_Policie7

Significant Accounting Policies (Estimated Future Annual Amortization Expense of Intangible Assets) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]	'
2014	$132,956
2015	111,016
2016	88,749
2017	61,057
2018	$47,618

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jan. 31, 2013

Dec. 31, 2013

Jul. 31, 2012

Dec. 31, 2013

Apr. 30, 2012

Apr. 30, 2012

Apr. 30, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Sep. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2013

Jan. 08, 2014

Enterprise and Service Provider division

Enterprise and Service Provider division

Zenprise

Zenprise

ByteMobile

ByteMobile

Podio

Podio

Podio

2012 Other Acquisitions

2012 Other Acquisitions

2012 Other Acquisitions

2012 Other Acquisitions

2012 Other Acquisitions

2012 Other Acquisitions

2012 Other Acquisitions

2013 Other Acquisitions

2013 Other Acquisitions

2013 Other Acquisitions

2013 Other Acquisitions

Subsequent Event [Member]

Product Related Technologies

Other

acquisitions

acquisitions

Enterprise and Service Provider division

Product Related Technologies

acquisitions

Maximum

Framehawk, Inc. [Member]

acquisitions

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total consideration in business acquisitions

'

'

'

'

$324,000,000

'

$399,500,000

'

$43,600,000

'

'

$5,300,000

$15,400,000

$24,600,000

'

'

'

'

$5,500,000

$5,300,000

'

'

$27,900,000

Contingent consideration amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

'

Cash acquired from the acquisition

'

'

'

'

2,900,000

'

5,600,000

'

1,700,000

'

'

'

200,000

600,000

'

'

'

'

'

'

'

'

300,000

Acquisition transaction costs

'

'

'

'

600,000

100,000

2,100,000

'

500,000

'

'

200,000

400,000

500,000

'

'

'

'

200,000

200,000

200,000

'

100,000

Acquisition transaction costs expensed during period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

400,000

100,000

'

'

'

'

'

'

'

Unvested stock options assumed in business acquisition

'

'

'

'

'

'

'

'

127,668

'

'

13,487

66,459

13,481

'

'

'

'

'

'

'

'

'

Stock options converted and assumed (in shares)

'

'

'

'

285,817

'

'

'

'

'

'

'

'

12,017

'

'

'

'

'

'

'

'

'

Number of privately-held businesses acquired

'

'

'

'

'

'

'

'

'

'

'

2

2

'

'

'

1

'

'

'

2

'

'

Net adjustment to preliminary purchase price allocation

'

'

'

'

'

'

'

3,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill acquired

251,468,000

[1]

283,860,000

[1]

248,800,000

257,379,000

'

'

'

'

24,500,000

'

'

'

'

22,800,000

'

'

'

'

'

'

'

'

'

Finite-lived Intangible assets acquired

'

'

'

'

'

$69,200,000

'

$248,900,000

$24,600,000

$20,700,000

$3,900,000

'

'

'

'

'

'

$11,000,000

$11,300,000

'

$11,300,000

'

'

[1]

Amount primarily relates to acquisitions. See Note 3 for more information regarding the Companybs acquisitions.

Acquisitions_Allocation_of_Tot

Acquisitions (Allocation of Total Purchase Prices) (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Jan. 31, 2013

Jan. 31, 2013

Dec. 31, 2013

Jan. 31, 2013

Jan. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

Zenprise

Zenprise

Zenprise

2013 Other Acquisitions

2013 Other Acquisitions

2013 Other Acquisitions

ByteMobile

ByteMobile

ByteMobile

Minimum

Maximum

Minimum

Maximum

Minimum

Maximum

Purchase Price Allocation

'

'

'

'

'

'

'

'

'

'

'

'

Current assets

'

'

'

$10,943

'

'

$3,586

'

'

$57,796

'

'

Other assets

'

'

'

668

'

'

0

'

'

7,406

'

'

Property and equipment

'

'

'

431

'

'

0

'

'

2,484

'

'

Deferred tax assets, non-current

'

'

'

38,785

'

'

3,177

'

'

44,934

'

'

Intangible assets

'

'

'

69,200

'

'

11,300

'

'

248,900

'

'

Goodwill

1,768,949

1,518,219

1,239,120

247,273

'

'

4,195

'

'

221,914

'

'

Assets acquired

'

'

'

367,300

'

'

22,258

'

'

583,434

'

'

Current liabilities assumed

'

'

'

-8,475

'

'

-3,950

'

'

-62,313

'

'

Deferred tax liabilities, current

'

'

'

0

'

'

-2,000

'

'

'

'

'

Long-term liabilities assumed

'

'

'

-3,107

'

'

-1,000

'

'

-4,083

'

'

Deferred tax liabilities, non-current

'

'

'

-28,725

'

'

-1,699

'

'

-111,904

'

'

Net assets acquired

'

'

'

$326,993

'

'

$13,609

'

'

$405,134

'

'

Finite-lived intangible assets acquired, Asset Life

'

'

'

'

'1 year

'7 years

'

'5 years

'6 years

'

'1 year

'9 years

Acquisitions_Identifiable_Inta

Acquisitions (Identifiable Intangible Assets Acquired) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Zenprise	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	$69,200
Zenprise | Trade names	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	2,400
Finite-lived intangible assets acquired, Asset Life	'3 years
Zenprise | Non-compete agreements	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	700
Finite-lived intangible assets acquired, Asset Life	'1 year
Zenprise | Customer relationships	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	18,300
Finite-lived intangible assets acquired, Asset Life	'7 years
Zenprise | Core and product technologies	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	47,800
Finite-lived intangible assets acquired, Asset Life	'6 years
Zenprise | In-process R&D	'
Business Acquisition [Line Items]	'
Indefinite-lived intangible assets acquired	0	[1]
2013 Other Acquisitions	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	11,300
2013 Other Acquisitions | Trade names	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	0
2013 Other Acquisitions | Non-compete agreements	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	0
2013 Other Acquisitions | Customer relationships	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	3,600
Finite-lived intangible assets acquired, Asset Life	'6 years
2013 Other Acquisitions | Core and product technologies	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	6,300
Finite-lived intangible assets acquired, Asset Life	'5 years
2013 Other Acquisitions | In-process R&D	'
Business Acquisition [Line Items]	'
Indefinite-lived intangible assets acquired	1,400	[1]
ByteMobile	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	248,900
ByteMobile | Trade names	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	6,000
Finite-lived intangible assets acquired, Asset Life	'6 years
ByteMobile | Customer relationships	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	141,500
Finite-lived intangible assets acquired, Asset Life	'9 years
ByteMobile | Core and product technologies	'
Business Acquisition [Line Items]	'
Finite-lived Intangible assets acquired	$101,400
Finite-lived intangible assets acquired, Asset Life	'4 years 9 months 18 days
[1]	Capitalized acquired in-process R&D costs will remain capitalized until such time as the projects are complete, at which point they will be amortized, or they will be written off when it is probable the projects will not be completed.

Acquisitions_Pro_Forma_Informa

Acquisitions (Pro Forma Information) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition, Pro Forma Information [Abstract]	'	'
Revenues	$2,921,604	$2,596,227
Income from operations	376,936	333,077
Net income	$336,250	$314,300
Per share - basic (in dollars per share)	$1.80	$1.68
Per share - diluted (in dollars per share)	$1.79	$1.66

Acquisitions_Subsequent_Events

Acquisitions (Subsequent Events) (Details) (Subsequent Event [Member], Framehawk, Inc. [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Jan. 08, 2014
Subsequent Event [Member] | Framehawk, Inc. [Member]	'
Subsequent Event [Line Items]	'
Preliminary consideration in business acquisition	$27.90
Cash acquired from the acquisition	0.3
Estimated acquisition transaction costs	$0.10

Investments_Narrative_Details

Investments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investment [Line Items]	'	'	'
Average remaining maturities for short-term available for sale investments, in months	'5 months	'	'
Average remaining maturities for long-term available for sale investments, in years	'3 years	'	'
Realized gains on the sales of available-for-sale investments	$3,000,000	$4,100,000	'
Realized losses on the sales of available-for-sale investments	2,700,000	800,000	'
Available-for-sale investments, carrying value	1,307,910,000	876,988,000	'
Available-for-sale investments, fair value	1,309,676,000	880,335,000	'
Other than temporary charge included in income	0	2,500,000	'
Gross unrealized losses	635,000	192,000	'
Cost method investments	24,300,000	26,200,000	'
Cost method investments, gain recorded on cost method investments	6,000,000	16,500,000	'
Cost method investment, impairment charge included other income	3,700,000	3,500,000	3,500,000
Other-than-temporary impairment	'	'	'
Investment [Line Items]	'	'	'
Available-for-sale investments, carrying value	'	5,000,000	'
Available-for-sale investments, fair value	'	$2,500,000	'

Investments_Schedule_Of_Availa

Investments (Schedule Of Available-For-Sale Securities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Investment [Line Items]	'	'
Amortized Cost	$1,307,910	$876,988
Gross Unrealized Gains	2,401	3,539
Gross Unrealized Losses	-635	-192
Fair Value	1,309,676	880,335
Agency securities	'	'
Investment [Line Items]	'	'
Amortized Cost	453,922	400,365
Gross Unrealized Gains	1,177	2,347
Gross Unrealized Losses	-349	-5
Fair Value	454,750	402,707
Corporate securities	'	'
Investment [Line Items]	'	'
Amortized Cost	643,360	404,546
Gross Unrealized Gains	947	947
Gross Unrealized Losses	-216	-171
Fair Value	644,091	405,322
Municipal securities	'	'
Investment [Line Items]	'	'
Amortized Cost	53,698	32,214
Gross Unrealized Gains	81	114
Gross Unrealized Losses	-23	-15
Fair Value	53,756	32,313
Government securities	'	'
Investment [Line Items]	'	'
Amortized Cost	156,930	39,863
Gross Unrealized Gains	196	131
Gross Unrealized Losses	-47	-1
Fair Value	$157,079	$39,993

Fair_Value_Measurements_Assets

Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Recurring basis | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	$1,595,368	$1,528,101
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	1,743	4,162
Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	280,351	627,133
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	0	0
Recurring basis | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	1,304,727	897,627
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	1,743	4,162
Recurring basis | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Total assets	10,291	3,341
Liabilities, Fair Value Disclosure [Abstract]	'	'
Total liabilities	0	0
Cash and cash equivalents | Corporate securities	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	389	'
Cash and cash equivalents | Corporate securities | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	'
Cash and cash equivalents | Corporate securities | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	389	'
Cash and cash equivalents | Corporate securities | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	'
Cash and cash equivalents | Recurring basis | Cash | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	227,528	503,614
Cash and cash equivalents | Recurring basis | Cash | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	227,528	503,614
Cash and cash equivalents | Recurring basis | Cash | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Cash and cash equivalents | Recurring basis | Cash | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Cash and cash equivalents | Recurring basis | Money market funds | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	52,823	123,519
Cash and cash equivalents | Recurring basis | Money market funds | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	52,823	123,519
Cash and cash equivalents | Recurring basis | Money market funds | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Cash and cash equivalents | Recurring basis | Money market funds | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	0	0
Cash and cash equivalents | Recurring basis | Corporate securities | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	'	16,476
Cash and cash equivalents | Recurring basis | Corporate securities | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	'	0
Cash and cash equivalents | Recurring basis | Corporate securities | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	'	16,476
Cash and cash equivalents | Recurring basis | Corporate securities | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Cash and cash equivalents	'	0
Available-for-sale securities | Recurring basis | Corporate securities | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	644,091	405,322
Available-for-sale securities | Recurring basis | Corporate securities | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Available-for-sale securities | Recurring basis | Corporate securities | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	633,801	401,981
Available-for-sale securities | Recurring basis | Corporate securities | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	10,291	3,341
Available-for-sale securities | Recurring basis | Agency securities | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	454,750	402,707
Available-for-sale securities | Recurring basis | Agency securities | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Available-for-sale securities | Recurring basis | Agency securities | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	454,750	402,707
Available-for-sale securities | Recurring basis | Agency securities | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Available-for-sale securities | Recurring basis | Municipal securities | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	53,756	32,313
Available-for-sale securities | Recurring basis | Municipal securities | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Available-for-sale securities | Recurring basis | Municipal securities | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	53,756	32,313
Available-for-sale securities | Recurring basis | Municipal securities | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Available-for-sale securities | Recurring basis | Government securities | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	157,079	39,993
Available-for-sale securities | Recurring basis | Government securities | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Available-for-sale securities | Recurring basis | Government securities | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	157,079	39,993
Available-for-sale securities | Recurring basis | Government securities | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Available-for-sale securities	0	0
Prepaid expenses and other current assets | Recurring basis | Estimate of fair value measurement	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	4,952	4,157
Prepaid expenses and other current assets | Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Prepaid expenses and other current assets | Recurring basis | Significant Other Observable Inputs (Level 2)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	4,952	4,157
Prepaid expenses and other current assets | Recurring basis | Significant Unobservable Inputs (Level 3)	'	'
Assets, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Accrued expenses and other current liabilities | Recurring basis | Estimate of fair value measurement	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	1,743	4,162
Accrued expenses and other current liabilities | Recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	0	0
Accrued expenses and other current liabilities | Recurring basis | Significant Other Observable Inputs (Level 2)	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	1,743	4,162
Accrued expenses and other current liabilities | Recurring basis | Significant Unobservable Inputs (Level 3)	'	'
Liabilities, Fair Value Disclosure [Abstract]	'	'
Foreign currency derivatives	$0	$0

Fair_Value_Measurements_Assets1

Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Cost method investments	$24,300,000	$26,200,000	'
Cost method investments, fair value of impaired investment	5,600,000	9,500,000	'
Cost method investment, impairment charge	3,700,000	3,500,000	3,500,000
Impaired investments	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Cost method investments	9,300,000	13,000,000	'
Convertible debt securities | Level 3	'	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'	'	'
Balance at December 31, 2012	3,341,000	'	'
Purchases of Level 3 securities	9,700,000	'	'
Transfers out of Level 3	-2,750,000	'	'
Balance at December 31, 2013	$10,291,000	'	'

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts Payable and Accrued Liabilities, Current [Abstract]	'	'
Accrued compensation and employee benefits	$141,065	$130,835
Other accrued expenses	116,541	126,300
Total	$257,606	$257,135

Employee_StockBased_Compensati2

Employee Stock-Based Compensation and Benefit Plans (Narrative) (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

plan

Defined contribution pension

Defined contribution pension

Defined contribution pension

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Market and service condition stock units

Market and service condition stock units

Market and service condition stock units

2005 Plan

2005 Plan

2005 Plan

2005 ESPP Plan

2005 ESPP Plan

2005 ESPP Plan

2005 ESPP Plan

2005 ESPP Plan

Minimum

Minimum

Maximum

First anniversary of date of grant

Equal monthly installments after first anniversary of date of grant

installment

Annual vesting on each anniversary

Third anniversary

Minimum

Maximum

Minimum

Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of stock-based compensation plans offered

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares authorized for issuance under 2005 Equity Incentive Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48,600,000

'

'

10,000,000

'

'

'

'

Ownership percentage of company where incentive stock options must be granted with an exercise price greater than fair market value (more than 10%)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

Exercise price of incentive stock options granted to individuals owning 10% or more of the Company's common stock, as a percentage of fair market value of common stock on the date of grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

110.00%

'

'

'

'

'

'

Shares reserved for issuance under the 2005 Equity Incentive Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26,960,367

'

'

'

'

'

'

'

Shares available for grant under the 2005 Equity Incentive Plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16,605,208

'

'

'

'

'

'

'

Employee Stock Purchase Plan, payment period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'6 months

'

'

'

'

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%

10.00%

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,991,834

'

'

'

'

Stock-based compensation

$183,941,000

[1]

$149,940,000

[1]

$92,909,000

[1]

'

'

'

$48,900,000

$56,400,000

$48,200,000

'

'

'

'

'

'

'

$130,200,000

$89,500,000

$40,000,000

'

'

'

'

'

'

'

'

$4,900,000

$4,000,000

$3,500,000

'

'

Stock-based compensation related deferred tax assets

57,100,000

46,700,000

28,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax benefit from compensation expense

55,700,000

65,800,000

67,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Award expiration period

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock option vesting period

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Award vesting percentage

'

'

'

'

'

'

'

'

'

'

'

'

33.30%

2.78%

'

'

'

'

'

33.33%

100.00%

'

'

'

'

'

'

'

'

'

'

'

Options assumed from acquisitions, award vesting period

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation cost related to stock-based compensation

'

'

'

'

'

'

29,700,000

'

'

'

'

'

'

'

'

'

237,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

The total intrinsic value of options exercised

'

'

'

'

'

'

77,700,000

131,400,000

169,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

The weighted average fair value per share of stock options granted (in dollars per share)

$56.97

$23.95

$29.91

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation cost recognition period (in years)

'

'

'

'

'

'

'1 year 2 months 18 days

'

'

'

'

'

'

'

'

'

'1 year 11 months 16 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-vested stock unit awards granted to senior level employees

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,765,386

'

'

'

'

399,029

418,809

'

'

'

'

'

'

'

'

'

Period to determine actual stock grant following end of performance period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'60 days

'

'

'

'

'

'

'

'

Performance period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'

'

Maximum percentage of market and service condition stock units that will ultimately vest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

200.00%

'

'

'

'

'

'

'

'

Minimum overperformance percentage against benchmark index return for maximum stock issuance, percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40.00%

'

'

'

'

'

'

'

'

Maximum underperformance against benchmark index return before company discontinues issuance of stock, percentage (more than 20%)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20.00%

'

'

'

'

'

'

'

'

Percent of award issued if return is negative but benchmark index is met

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75.00%

'

'

'

'

'

'

'

'

Number of shares represented by each award upon vesting

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility rate, calculation basis, period

'

'

'

'

'

'

'3 years 4 months 6 days

'

'

'3 years 10 months 28 days

'3 years 3 months 7 days

'3 years 10 months 28 days

'

'

'

'

'2 years 9 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Granted (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$89.93

$89.95

$71.84

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation award, stock vesting period, monthly installments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of awards released

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

95,400,000

50,300,000

21,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

401(k) Benefit Plan [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum annual contribution per employee (as a percent)

60.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contribution per dollar of employee contribution

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Matching percent

3.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employer contributions

'

'

'

$12,700,000

$10,500,000

$9,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employer contributions, vesting period

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employer contributions, annual vesting rate

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Employee_StockBased_Compensati3

Employee Stock-Based Compensation and Benefit Plans (Detail of the Total Stock-Based Compensation Recognized by Income Statement Classification) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Stock-based compensation	$183,941	[1]	$149,940	[1]	$92,909	[1]
Cost of services revenues	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Stock-based compensation	2,540		2,111		1,584
Research and development	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Stock-based compensation	63,448		54,616		31,763
Sales, marketing and services	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Stock-based compensation	65,549		51,519		31,354
General and administrative	'		'		'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'		'		'
Stock-based compensation	$52,404		$41,694		$28,208
[1]	Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Employee_StockBased_Compensati4

Employee Stock-Based Compensation and Benefit Plans (Schedule of Stock Option Activity) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Number of Options	'	'
Outstanding at December 31, 2012 (in shares)	7,589,532	'
Assumed (in shares)	285,817	'
Exercised (in shares)	-2,168,531	'
Forfeited or expired (in shares)	-299,841	'
Outstanding at December 31, 2013 (in shares)	5,406,977	7,589,532
Weighted- Average Exercise Price	'	'
Outstanding at December 31, 2012 (in dollars per share)	$54.15	'
Assumed (in dollars per share)	$11.85	'
Exercised (in dollars per share)	$33.97	'
Forfeited or expired (in dollars per share)	$60.90	'
Outstanding at December 31, 2013 (in dollars per share)	$59.64	$54.15
Additional Disclosures on Options	'	'
Weighted- Average Remaining Contractual Life, Outstanding at December 31, 2012 (in years)	'2 years 1 month 25 days	'2 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding at December 31, 2013	$57,583	'
Weighted- Average Remaining Contractual Life, Outstanding at December 31, 2013 (in years)	'2 years 1 month 25 days	'2 years 8 months 12 days
Exercisable at December 31, 2013 (in shares)	4,438,465	'
Weighted Average Exercise Price, Exercisable at December 31, 2013 (in dollars per share)	$61.88	'
Weighted-Average Remaining Contractual Life, Exercisable at December 31, 2013 (in years)	'1 year 11 months 5 days	'
Aggregate intrinsic value, options exercisable at December 31, 2013	38,167	'
Vested or expected to vest	'	'
Vested or expected to vest (in shares)	5,366,212	'
Weighted- Average Exercise Price (in dollars per share)	$59.78	'
Weighted- Average Remaining Contractual Life (in years)	'2 years 1 month 20 days	'
Aggregate Intrinsic Value	$56,548	'

Employee_StockBased_Compensati5

Employee Stock-Based Compensation and Benefit Plans (Assumptions Used To Value Option Grants) (Details)

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2013

Mar. 31, 2012

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2013

Mar. 31, 2012

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Employee sock option

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Non-vested stock

Minimum

Minimum

Maximum

Maximum

Minimum

Minimum

Maximum

Maximum

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected volatility factor

39.00%

'

'

38.00%

38.00%

43.00%

50.00%

'

'

'

16.00%

21.00%

42.00%

39.00%

Approximate risk free interest rate

0.40%

'

'

0.50%

0.60%

0.70%

1.10%

0.33%

0.47%

'

'

'

'

'

Expected term (in years)

'3 years 4 months 6 days

'

'

'3 years 10 months 28 days

'3 years 3 months 7 days

'

'3 years 10 months 28 days

'

'

'2 years 9 months

'

'

'

'

Expected dividend yield

0.00%

0.00%

0.00%

'

'

'

'

0.00%

0.00%

'

'

'

'

'

Employee_StockBased_Compensati6

Employee Stock-Based Compensation and Benefit Plans (Schedule of Non-vested Stock Unit Activity) (Details) (Non-vested stock, USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2013
Non-vested stock	'	'	'
Number of Shares	'	'	'
Non-vested stock units at December 31, 2012 (in shares)	3,607,561	'	3,607,561
Granted (in shares)	'	'	2,765,386
Vested (in shares)	'	'	-1,375,165
Forfeited (in shares)	'	'	-365,803
Non-vested stock units at December 31, 2013 (in shares)	'	'	4,631,979
Weighted- Average Fair Value at Grant Date	'	'	'
Non-vested stock units at December 31, 2012 (in dollars per share)	$74.70	'	$74.70
Granted (in dollars per share)	$89.93	$89.95	$71.84
Vested (in dollars per share)	'	'	$69.36
Forfeited (in dollars per share)	'	'	$76.16
Non-vested stock units at December 31, 2013 (in dollars per share)	'	'	$74.47

Capital_Stock_Narrative_Detail

Capital Stock (Narrative) (Details) (USD $)	1 Months Ended	12 Months Ended
	Oct. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]	'	'	'	'
Stock repurchase program, authorized amount	$500,000,000	$3,900,000,000	'	'
Available to repurchase common stock	'	429,300,000	'	'
Amount expended on share repurchases in open market transactions	'	406,326,000	251,008,000	424,849,000
Number of shares repurchased	'	6,563,986	3,550,817	6,275,470
Average per share price on share repurchases in open market transactions (in dollars per share)	'	$61.90	$70.69	$67.70
Total tax withholdings for share-based compensation (in shares)	'	444,657	269,745	182,203
Total tax withholdings for share-based compensation	'	$31,013,000	$20,170,000	$13,262,000
Preferred stock, shares authorized	'	5,000,000	5,000,000	'
Preferred stock, par value	'	$0.01	$0.01	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 17, 2012
				SSL Services
Loss Contingencies [Line Items]	'	'	'	'
Rental expense	$70,900,000	$65,100,000	$56,500,000	'
Sublease Income	300,000	200,000	200,000	'
Total operating lease obligations remaining	276,590,000	'	'	'
Loss Contingency, Information about Litigation Matters [Abstract]	'	'	'	'
Final damages awarded, confirmed by court	'	'	'	10,000,000
Enhanced damages awarded	'	'	'	5,000,000
Prejudgment interest on damages awarded	'	'	'	5,000,000
Purchase obligations anticipated for 2014	13,100,000	'	'	'
Contingent obligations to purchase inventory	$18,200,000	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies (Schedule of Lease Commitments) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Operating Leases	'
2014	$60,982
2015	46,770
2016	39,353
2017	22,064
2018	18,536
Thereafter	88,885
Total	276,590
Sublease Income	'
2014	255
2015	260
2016	227
2017	218
2018	203
Thereafter	0
Total	$1,163

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Operating Loss Carryforwards [Line Items]	'	'
Valuation allowance	($26,465,000)	($18,185,000)
Interest on tax positions	800,000	'
Accrued interest on tax positions	0	'
Tax benefit expected to be recognized in the first quarter of 2013 under the provisions of the American Taxpayer Relief Act of 2012	10,700,000	'
Research	'	'
Operating Loss Carryforwards [Line Items]	'	'
Undistributed earnings from foreign subsidiaries	1,238,000,000	'
Tax credit carry forwards	55,600,000	'
United States	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss carry forwards	220,000,000	'
Foreign jurisdictions	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss carry forwards	$52,000,000	'

Income_Taxes_United_States_and

Income Taxes (United States and Foreign Components of Income Before Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]	'	'	'
United States	$142,085	$200,802	$176,824
Foreign	245,805	209,427	253,673
Income before income taxes	$387,890	$410,229	$430,497

Income_Taxes_Components_of_the

Income Taxes (Components of the Provision for Income Taxes) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	$51,389	$81,019	$50,022
Foreign	37,221	30,059	29,169
State	11,605	17,395	11,905
Total current	100,215	128,473	91,096
Deferred:	'	'	'
Federal	-34,897	-64,960	-8,631
Foreign	-8,413	1,409	-4,792
State	-8,538	-7,240	-2,806
Total deferred	-51,848	-70,791	-16,229
Total provision	$48,367	$57,682	$74,867

Income_Taxes_Deferred_Tax_Asse

Income Taxes (Deferred Tax Assets and Liabilities by Balance Sheet Classification (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Tax Assets and Liabilities by Balance Sheet Classification [Abstract]	'	'
Deferred tax assets - current	$48,470	$36,846
Deferred tax liabilities - current	-364	-876
Deferred tax assets- non current	115,418	43,097
Deferred tax liabilities - non current	-13,127	-19,756
Total net deferred tax assets	$150,397	$59,311

Income_Taxes_Components_of_Def

Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred tax assets:	'	'
Accruals and reserves	$25,556	$36,128
Deferred revenue	55,688	41,820
Tax credits	60,519	43,657
Net operating losses	103,329	89,856
Other	10,537	8,452
Stock based compensation	72,074	54,852
Depreciation and amortization	1,675	0
Valuation allowance	-26,465	-18,185
Total deferred tax assets	302,913	256,580
Deferred tax liabilities:	'	'
Depreciation and amortization	0	40,159
Acquired technology	-136,258	-140,017
Prepaid expenses	-16,258	-17,093
Total deferred tax liabilities	-152,516	-197,269
Total net deferred tax assets	$150,397	$59,311

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of the Company's Effective Tax Rate to the Statutory Federal Rate) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]	'	'	'
Federal statutory taxes	35.00%	35.00%	35.00%
State income taxes, net of federal tax benefit	1.20%	1.90%	1.70%
Foreign operations	-14.80%	-10.20%	-14.50%
Permanent differences	-1.10%	-2.00%	1.20%
Tax credits	-10.90%	-4.70%	-7.10%
Stock option compensation	0.40%	0.10%	0.10%
Change in accruals for uncertain tax positions	3.30%	-5.30%	1.40%
Other	-0.60%	-0.70%	-0.40%
Effective income tax rate	12.50%	14.10%	17.40%

Income_Taxes_Reconciliation_of1

Income Taxes (Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits [Roll Forward]	'	'
Beginning balance	$43,904	$79,199
Additions based on tax positions related to the current year	13,694	2,459
Additions for tax positions of prior years	10,611	9,558
Reductions related to the expiration of statutes of limitations	-2,116	-33,594
Settlements	-2,301	-13,718
Ending balance	$63,792	$43,904

Segment_Information_Narrative_

Segment Information (Narrative) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
									segment
Concentration Risk [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	$802,420	$712,731	$730,384	$672,899	$739,996	$641,422	$615,210	$589,495	$2,918,434	$2,586,123	$2,206,392
Number of reportable segments	'	'	'	'	'	'	'	'	2	'	'
Percentage of international revenues accounting for the Company's net revenues	'	'	'	'	'	'	'	'	45.40%	45.30%	43.20%
US to International Revenues	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	$215,300	$127,400	$106,000
Ingram Micro | Net revenues | Customer concentration risk	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Number of customers meeting concentration risk threshold	1	'	'	'	1	'	'	'	1	1	1
Concentration risk percentage	'	'	'	'	'	'	'	'	14.00%	16.00%	17.00%

Segment_Information_Net_Revenu

Segment Information (Net Revenues And Profit By Segment) (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

$802,420

$712,731

$730,384

$672,899

$739,996

$641,422

$615,210

$589,495

$2,918,434

$2,586,123

$2,206,392

Segment profit

160,854

87,367

75,888

56,608

145,421

82,415

82,192

80,750

380,717

390,778

416,966

Amortization of intangible assets

'

'

'

'

'

'

'

'

-139,541

[1]

-114,574

[1]

-71,131

[1]

Restructuring

'

'

'

'

'

'

'

'

0

[1]

0

[1]

-24

[1]

Net interest and other income

'

'

'

'

'

'

'

'

7,173

[1]

19,451

[1]

13,531

[1]

Stock-based compensation

'

'

'

'

'

'

'

'

-183,941

[1]

-149,940

[1]

-92,909

[1]

Consolidated income before income taxes

'

'

'

'

'

'

'

'

387,890

410,229

430,497

Enterprise and Service Provider division

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

2,335,562

2,074,800

1,778,646

Segment profit

'

'

'

'

'

'

'

'

588,138

562,794

504,883

SaaS division

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

582,872

511,323

427,746

Segment profit

'

'

'

'

'

'

'

'

$116,061

$92,498

$76,147

[1]

Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.

Segment_Information_Identifiab

Segment Information (Identifiable Assets By Segment) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]	'	'
Identifiable assets	$5,212,249	$4,796,402
Long-lived assets	338,996	303,294
United States	'	'
Segment Reporting Information [Line Items]	'	'
Long-lived assets	258,114	231,812
United Kingdom	'	'
Segment Reporting Information [Line Items]	'	'
Long-lived assets	29,382	30,633
Other countries	'	'
Segment Reporting Information [Line Items]	'	'
Long-lived assets	51,500	40,849
Enterprise and Service Provider division	'	'
Segment Reporting Information [Line Items]	'	'
Identifiable assets	4,662,724	4,246,292
SaaS division	'	'
Segment Reporting Information [Line Items]	'	'
Identifiable assets	$549,525	$550,110

Segment_Information_Revenues_B

Segment Information (Revenues By Product Grouping) (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

$802,420

$712,731

$730,384

$672,899

$739,996

$641,422

$615,210

$589,495

$2,918,434

$2,586,123

$2,206,392

Enterprise and Service Provider division

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

2,335,562

2,074,800

1,778,646

Enterprise and Service Provider division | Mobile and Desktop revenues

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

1,549,383

[1]

1,450,850

[1]

1,278,798

[1]

Enterprise and Service Provider division | Networking and Cloud revenues

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

634,598

[2]

496,608

[2]

385,518

[2]

Enterprise and Service Provider division | Professional services

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

138,879

[3]

119,061

[3]

91,496

[3]

Enterprise and Service Provider division | Other

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

12,702

8,281

22,834

SaaS division revenues

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net revenues

'

'

'

'

'

'

'

'

$582,872

$511,323

$427,746

[1]

Mobile and Desktop revenues are primarily comprised of sales from the Companybs desktop and application virtualization products, XenDesktop and XenApp, and the Company's Mobility products, which include XenMobile and related license updates and maintenance and support.

[2]

Networking and Cloud revenues are primarily comprised of sales from the Companybs cloud networking products, which include NetScaler, CloudBridge and ByteMobile Smart Capacity, and the Companybs cloud platform products which include XenServer, CloudPlatform and CloudPortal and related license updates and maintenance and support.

[3]

Professional services revenues are primarily comprised of revenues from consulting services and product training and certification services.

Segment_Information_Revenues_B1

Segment Information (Revenues By Geographic Location) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	$802,420	$712,731	$730,384	$672,899	$739,996	$641,422	$615,210	$589,495	$2,918,434	$2,586,123	$2,206,392
Enterprise and Service Provider division	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	2,335,562	2,074,800	1,778,646
Enterprise and Service Provider division | Americas	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	1,263,673	1,106,801	993,062
Enterprise and Service Provider division | EMEA	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	785,862	691,111	576,953
Enterprise and Service Provider division | Asia-Pacific	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	286,027	276,888	208,631
SaaS division	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	582,872	511,323	427,746
SaaS division | Americas	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	488,307	433,263	367,260
SaaS division | EMEA	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	73,529	63,484	50,711
SaaS division | Asia-Pacific	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	'	'	'	'	'	'	'	'	$21,036	$14,576	$9,775

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'
Cash flow hedge instrument term, maximum historical term	'12 months	'
Cash flow hedge instrument term, maximum	'18 months	'
Cumulative unrealized gain (loss) on cash flow derivative instruments in accumulated other comprehensive loss	$2.90	$0

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Instruments) (Details) (Cash flow hedging, Foreign currency, Forward contracts, USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives Designated as Hedging Instruments | Prepaid expenses and other current assets	'	'
Asset Derivatives	'	'
Derivative assets fair value	$4,559	$4,157
Derivatives Designated as Hedging Instruments | Accrued expenses and other current liabilities	'	'
Liability Derivatives	'	'
Derivative liabilities fair value	1,578	4,162
Derivatives Not Designated as Hedging Instruments | Prepaid expenses and other current assets	'	'
Asset Derivatives	'	'
Derivative assets fair value	393	448
Derivatives Not Designated as Hedging Instruments | Accrued expenses and other current liabilities	'	'
Liability Derivatives	'	'
Derivative liabilities fair value	$165	$52

Derivative_Financial_Instrumen4

Derivative Financial Instruments (Schedule Of Effect Of Derivative Instruments On Financial Performance) (Details) (Cash flow hedging, Foreign currency, Forward contracts, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives Designated as Hedging Instruments	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of Gain Recognized in Other Comprehensive Income (Loss) (Effective Portion)	$2,862	$5,164
Derivatives Designated as Hedging Instruments | Operating expenses	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of Loss Reclassified from Accumulated Other Comprehensive Income (Loss) (Effective Portion)	-2,929	-5,817
Derivatives Not Designated as Hedging Instruments | Other (expense) income, net	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Amount of Gain (Loss) Recognized in Income on Derivative	$3,138	($1,341)

Derivative_Financial_Instrumen5

Derivative Financial Instruments (Schedule Of Net Notional Foreign Currency Forward Contracts Outstanding) (Details)

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

In Thousands, unless otherwise specified

AUD

CAD

CHF

CNY

DKK

EUR (€)

GBP (£)

HKD

INR

JPY (¥)

NZD

SGD

Derivative Instruments and Hedging Activities Disclosure [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Net notional foreign currency forward contracts outstanding

8,012

6,714

19,741

81,250

1,500

€ 27,820

£ 34,475

51,063

1,201,622

¥ 169,004

300

12,600

Net_Income_Per_Share_Attributa2

Net Income Per Share Attributable To Citrix Systems, Inc. Stockholders (Net Income Per Share Basic And Diluted) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator:	'	'	'	'	'	'	'	'	'	'	'
Net income attributable to Citrix Systems, Inc. stockholders	$138,644	$76,730	$64,461	$59,688	$114,029	$78,245	$92,006	$68,267	$339,523	$352,547	$356,322
Denominator:	'	'	'	'	'	'	'	'	'	'	'
Denominator for basic earnings per share - weighted-average shares outstanding	'	'	'	'	'	'	'	'	186,672	186,722	187,315
Effect of dilutive employee stock awards:	'	'	'	'	'	'	'	'	'	'	'
Employee stock awards	'	'	'	'	'	'	'	'	1,573	2,407	3,326
Denominator for diluted earnings per share - weighted-average shares outstanding	'	'	'	'	'	'	'	'	188,245	189,129	190,641
Net income per share attributable to Citrix Systems, Inc. stockholders - basic (in dollars per share)	$0.75	$0.41	$0.34	$0.32	$0.61	$0.42	$0.49	$0.37	$1.82	$1.89	$1.90
Net income per share attributable to Citrix Systems, Inc. stockholders - diluted (in dollars per share)	$0.74	$0.41	$0.34	$0.32	$0.60	$0.41	$0.49	$0.36	$1.80	$1.86	$1.87
Anti-dilutive weighted-average shares	'	'	'	'	'	'	'	'	3,647	3,464	2,576

Comprehensive_Income_Changes_i

Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'
Balance at December 31, 2012	($7,705)	'	'
Other comprehensive income before reclassifications	9,930	'	'
Amounts reclassified from Accumulated other comprehensive income (loss)	2,726	'	'
Other comprehensive income (loss)	12,656	3,856	-13,584
Balance at December 31, 2013	4,951	-7,705	'
Foreign currency	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'
Balance at December 31, 2012	-3,024	'	'
Other comprehensive income before reclassifications	8,482	'	'
Amounts reclassified from Accumulated other comprehensive income (loss)	0	'	'
Other comprehensive income (loss)	8,482	'	'
Balance at December 31, 2013	5,458	'	'
Unrealized gain (loss) on available-for-sale securities	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'
Balance at December 31, 2012	2,426	'	'
Other comprehensive income before reclassifications	-985	'	'
Amounts reclassified from Accumulated other comprehensive income (loss)	-203	'	'
Other comprehensive income (loss)	-1,188	'	'
Balance at December 31, 2013	1,238	'	'
Unrealized gain (loss) on derivative instruments	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'
Balance at December 31, 2012	-10	'	'
Other comprehensive income before reclassifications	-67	'	'
Amounts reclassified from Accumulated other comprehensive income (loss)	2,929	'	'
Other comprehensive income (loss)	2,862	'	'
Balance at December 31, 2013	2,852	'	'
Other comprehensive gain (loss) on pension liability	'	'	'
Accumulated Other Comprehensive Income (Loss) [Roll Forward]	'	'	'
Balance at December 31, 2012	-7,097	'	'
Other comprehensive income before reclassifications	2,500	'	'
Amounts reclassified from Accumulated other comprehensive income (loss)	0	'	'
Other comprehensive income (loss)	2,500	'	'
Balance at December 31, 2013	($4,597)	'	'

Comprehensive_Income_Reclassif

Comprehensive Income (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'
Unrealized net gain on available-for-sale securities	($1,021)		$9,299	($288)
Unrealized net losses on cash flow hedges	-2,034,922		-1,791,208	-1,495,827
Consolidated net income	339,523		352,547	355,630
Amount reclassified from Accumulated other comprehensive income (loss), net of tax	'		'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'
Consolidated net income	-2,726		'	'
Amount reclassified from Accumulated other comprehensive income (loss), net of tax | Unrealized net gain on available-for-sale securities	'		'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'
Unrealized net gain on available-for-sale securities	203		'	'
Amount reclassified from Accumulated other comprehensive income (loss), net of tax | Unrealized net losses on cash flow hedges	'		'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'		'	'
Unrealized net losses on cash flow hedges	($2,929)	[1]	'	'
[1]	Operating expenses amounts allocated to Research and development, Sales, marketing and services, and General and administrative are not individually significant.

Quarterly_Financial_Informatio2

Quarterly Financial Information (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net revenues	$802,420,000	$712,731,000	$730,384,000	$672,899,000	$739,996,000	$641,422,000	$615,210,000	$589,495,000	$2,918,434,000	$2,586,123,000	$2,206,392,000
Gross margin	665,712,000	588,798,000	603,144,000	557,985,000	622,628,000	535,354,000	520,852,000	503,152,000	2,415,639,000	2,181,986,000	1,912,793,000
Income from operations	160,854,000	87,367,000	75,888,000	56,608,000	145,421,000	82,415,000	82,192,000	80,750,000	380,717,000	390,778,000	416,966,000
Net income attributable to Citrix Systems, Inc.	138,644,000	76,730,000	64,461,000	59,688,000	114,029,000	78,245,000	92,006,000	68,267,000	339,523,000	352,547,000	356,322,000
Net income per share attributable to Citrix Systems, Inc. stockholders - basic (in dollars per share)	$0.75	$0.41	$0.34	$0.32	$0.61	$0.42	$0.49	$0.37	$1.82	$1.89	$1.90
Net income per share attributable to Citrix Systems, Inc. stockholders - diluted (in dollars per share)	$0.74	$0.41	$0.34	$0.32	$0.60	$0.41	$0.49	$0.36	$1.80	$1.86	$1.87
ctxs-adjustment to excess tax benefit from stock based compensation	'	'	'	'	'	'	'	'	17,300,000	'	'
Net cash provided by operating activities	'	'	'	266,600,000	'	'	'	'	928,343,000	818,527,000	679,122,000
Net cash used in financing activities	'	'	'	$28,900,000	'	'	'	'	$352,281,000	$149,782,000	$292,614,000

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Balance at End of Period	$2,100		$2,600		'
Allowance for doubtful accounts	'		'		'
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Beginning of Period	3,883		2,564		3,409
Charged to Costs and Expenses	1,046		1,784		266
Charged to Other Accounts	0	[1]	1,119	[1]	1,468	[1]
Deductions	1,637	[2]	1,584	[2]	2,579	[2]
Balance at End of Period	3,292		3,883		2,564
Allowance for returns	'		'		'
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Beginning of Period	2,564		1,361		850
Charged to Costs and Expenses	0		0		0
Charged to Other Accounts	4,473	[3]	10,742	[3]	5,542	[3]
Deductions	4,975	[4]	9,539	[4]	5,031	[4]
Balance at End of Period	2,062		2,564		1,361
Valuation allowance for deferred tax assets	'		'		'
Movement in Valuation Allowances and Reserves [Roll Forward]	'		'		'
Beginning of Period	18,185		9,235		13,999
Charged to Costs and Expenses	0		0		0
Charged to Other Accounts	8,280	[5]	8,950	[6]	-4,764	[6]
Deductions	0		0		0
Balance at End of Period	$26,465		$18,185		$9,235
[1]	Adjustments from acquisitions.
[2]	Uncollectible accounts written off, net of recoveries.
[3]	Charged against revenues.
[4]	Credits issued for returns.
[5]	Related to deferred tax assets on foreign tax credits, net operating loss carryforwards, and depreciation.
[6]	Related to deferred tax assets on unrealized losses and acquisitions.