Intangible Assets, Net (Schedule Of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 259,165	$ 248,080
Accumulated Amortization	(149,065)	(139,884)
Net Carrying Amount	110,100	108,196
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	88,427	80,682
Accumulated Amortization	(34,219)	(30,434)
Net Carrying Amount	54,208	50,248
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	95,366	93,976
Accumulated Amortization	(73,316)	(69,908)
Net Carrying Amount	22,050	24,068
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	30,592	30,221
Accumulated Amortization	(15,603)	(14,941)
Net Carrying Amount	14,989	15,280
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	44,780	43,201
Accumulated Amortization	(25,927)	(24,601)
Net Carrying Amount	$ 18,853	$ 18,600