Intangible Assets, Net (Schedule Of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 282,989	$ 272,372
Accumulated Amortization	(162,662)	(163,709)
Net Carrying Amount	120,327	108,663
Capitalized Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	110,565	103,887
Accumulated Amortization	(30,911)	(39,180)
Net Carrying Amount	79,654	64,707
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	95,443	94,124
Accumulated Amortization	(83,578)	(79,485)
Net Carrying Amount	11,865	14,639
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	32,497	31,513
Accumulated Amortization	(18,872)	(17,573)
Net Carrying Amount	13,625	13,940
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	44,484	42,848
Accumulated Amortization	(29,301)	(27,471)
Net Carrying Amount	$ 15,183	$ 15,377