Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 802,048	$ 759,152	$ 728,101	$ 806,256
Accumulated Amortization	(509,118)	(467,482)
Net	292,930	291,670
Core Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	406,570	378,705
Accumulated Amortization	(302,669)	(274,198)
Net	103,901	104,507
Customer Contracts And Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	307,223	282,997
Accumulated Amortization	(131,606)	(110,539)
Net	175,617	172,458
Trade Marks And Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	77,078	73,194
Accumulated Amortization	(64,196)	(59,235)
Net	12,882	13,959
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	11,177	24,256
Accumulated Amortization	(10,647)	(23,510)
Net	$ 530	$ 746