Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Intangible Assets [Line Items]
Total intangible assets, gross	$ 778,759	$ 749,194	$ 802,048	$ 759,152
Accumulated Amortization	(524,742)	(509,694)
Total intangible assets, net	254,017	239,500
Intangible Asset Subject to Amortization [Member]
Intangible Assets [Line Items]
Gross Assets	759,359	749,194
Accumulated Amortization	(524,742)	(509,694)
Net	234,617	239,500
Core Developed Technology [Member]
Intangible Assets [Line Items]
Gross Assets	396,671	387,606
Accumulated Amortization	(313,062)	(305,285)
Net	83,609	82,321
Customer Contracts And Relationships [Member]
Intangible Assets [Line Items]
Gross Assets	280,894	278,581
Accumulated Amortization	(138,343)	(131,418)
Net	142,551	147,163
Trademarks And Trade Names [Member]
Intangible Assets [Line Items]
Gross Assets	70,701	71,854
Accumulated Amortization	(62,339)	(62,206)
Net	8,362	9,648
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Gross Assets	11,093	11,153
Accumulated Amortization	(10,998)	(10,785)
Net	95	368
In Process Research and Development [Member] | Intangible Asset Not Subject to Amortization [Member]
Intangible Assets [Line Items]
Indefinite-lived Intangible Assets	$ 19,400	$ 0