Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Gross Assets	$ 769,992	$ 804,281	$ 798,040	$ 802,540
Accumulated Amortization	(614,560)	(608,441)
Net	155,432	195,840
Core-developed technology [Member]
Intangible Assets [Line Items]
Gross Assets	414,289	428,890
Accumulated Amortization	(361,336)	(356,017)
Net	52,953	72,873
Customer contracts and relationships [Member]
Intangible Assets [Line Items]
Gross Assets	274,073	291,185
Accumulated Amortization	(176,036)	(173,952)
Net	98,037	117,233
Trademarks and trade names [Member]
Intangible Assets [Line Items]
Gross Assets	70,046	73,117
Accumulated Amortization	(66,146)	(67,449)
Net	3,900	5,668
Other [Member]
Intangible Assets [Line Items]
Gross Assets	11,584	11,089
Accumulated Amortization	(11,042)	(11,023)
Net	$ 542	$ 66