Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Intangible Assets [Line Items]
Total intangible assets, gross	$ 793,814	$ 749,194	$ 773,262	$ 759,152
Accumulated Amortization	(546,178)	(509,694)
Total intangible assets, net	247,636	239,500
Intangible Asset Subject to Amortization [Member]
Intangible Assets [Line Items]
Gross Assets	774,414	749,194
Accumulated Amortization	(546,178)	(509,694)
Net	228,236	239,500
Core Developed Technology [Member]
Intangible Assets [Line Items]
Gross Assets	402,897	387,606
Accumulated Amortization	(323,629)	(305,285)
Net	79,268	82,321
Customer Contracts And Relationships [Member]
Intangible Assets [Line Items]
Gross Assets	288,429	278,581
Accumulated Amortization	(147,614)	(131,418)
Net	140,815	147,163
Trademarks And Trade Names [Member]
Intangible Assets [Line Items]
Gross Assets	71,992	71,854
Accumulated Amortization	(63,922)	(62,206)
Net	8,070	9,648
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Gross Assets	11,096	11,153
Accumulated Amortization	(11,013)	(10,785)
Net	83	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