Segment Information (Net Revenues And Profit By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 851,483	$ 758,994	$ 781,560	$ 750,819	$ 802,420	$ 712,731	$ 730,384	$ 672,899	$ 3,142,856		$ 2,918,434		$ 2,586,123
Segment profit	117,408	58,597	54,419	71,887	160,854	87,367	75,888	56,608	302,311		380,717		390,778
Amortization of intangible assets									(192,325)	[1]	(139,541)	[1]	(114,574)	[1]
Patent litigation charge									(20,727)	[1]	0	[1]	0	[1]
Restructuring									(20,424)	[1]	0	[1]	0	[1]
Net interest and other (expense) income									(26,605)	[1]	7,173	[1]	19,451	[1]
Stock-based compensation									(169,287)	[1]	(183,941)	[1]	(149,940)	[1]
Consolidated income before income taxes									275,706		387,890		410,229
Enterprise and Service Provider division
Segment Reporting Information [Line Items]
Net revenues									2,491,294		2,335,562		2,074,800
Segment profit									589,076		588,138		562,794
Mobility Apps division
Segment Reporting Information [Line Items]
Net revenues									651,562		582,872		511,323
Segment profit									$ 115,998		$ 116,061		$ 92,498

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