Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 669,896	$ 702,507	$ 748,148
Accumulated Amortization	(597,745)	(600,575)
Net	72,151	101,932
Core-developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	372,568	388,981
Accumulated Amortization	(354,878)	(358,092)
Net	17,690	30,889
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	224,467	238,379
Accumulated Amortization	(170,056)	(168,885)
Net	54,411	69,494
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	61,785	64,069
Accumulated Amortization	(61,766)	(62,571)
Net	19	1,498
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,076	11,078
Accumulated Amortization	(11,045)	(11,027)
Net	$ 31	$ 51