Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Assets	$ 802,540	$ 749,194	$ 759,152
Accumulated Amortization	(563,769)	(509,694)
Net	238,771	239,500
Intangible Asset Subject to Amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	783,140	749,194
Accumulated Amortization	(563,769)	(509,694)
Net	219,371	239,500
In-process research and development [Member] | Intangible Asset Not Subject to Amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	19,400	0
Core-developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	407,024	387,606
Accumulated Amortization	(332,763)	(305,285)
Net	74,261	82,321
Customer contracts and relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	292,252	278,581
Accumulated Amortization	(154,890)	(131,418)
Net	137,362	147,163
Trademarks and trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	72,770	71,854
Accumulated Amortization	(65,090)	(62,206)
Net	7,680	9,648
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Assets	11,094	11,153
Accumulated Amortization	(11,026)	(10,785)
Net	$ 68	$ 368