Intangible Assets Finite-Lived Intangible Assets by Major Class (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 14,800,000	$ 11,000,000	$ 6,900,000
Intangible Assets, Net (Excluding Goodwill)	70,284,000	85,043,000
Finite-Lived Intangible Assets, Gross	171,889	171,889
Finite-Lived Intangible Assets, Accumulated Amortization	(101,605)	(86,846)
Finite-Lived Intangible Assets, Net	70,284	85,043
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,472	6,472
Finite-Lived Intangible Assets, Accumulated Amortization	(6,450)	(6,454)
Finite-Lived Intangible Assets, Net	22	18
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	37,000	37,000
Finite-Lived Intangible Assets, Accumulated Amortization	(17,543)	(13,148)
Finite-Lived Intangible Assets, Net	19,457	23,852
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,536	11,536
Finite-Lived Intangible Assets, Accumulated Amortization	(4,670)	(4,005)
Finite-Lived Intangible Assets, Net	6,866	7,531
Order or Production Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,127	2,127
Finite-Lived Intangible Assets, Accumulated Amortization	(2,127)	(2,102)
Finite-Lived Intangible Assets, Net	0	25
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	114,754	114,754
Finite-Lived Intangible Assets, Accumulated Amortization	(70,815)	(61,137)
Finite-Lived Intangible Assets, Net	43,939	53,617
Continuous Computing [Member] | Continuous Computing [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 89,240,000