Intangible Assets Finite-Lived Intangible Assets by Major Class (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 171,889,000	$ 171,889,000
Finite-Lived Intangible Assets, Accumulated Amortization	(115,379,000)	(101,605,000)
Total estimated future amortization expense	56,510,000	70,284,000
Amortization of Intangible Assets	13,800,000	14,800,000	11,300,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years
Purchased Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	114,754,000	114,754,000
Finite-Lived Intangible Assets, Accumulated Amortization	(79,189,000)	(70,815,000)
Total estimated future amortization expense	35,565,000	43,939,000
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,472,000	6,472,000
Finite-Lived Intangible Assets, Accumulated Amortization	(6,472,000)	(6,450,000)
Total estimated future amortization expense	0	22,000
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	37,000,000	37,000,000
Finite-Lived Intangible Assets, Accumulated Amortization	(21,997,000)	(17,543,000)
Total estimated future amortization expense	15,003,000	19,457,000
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	11,536,000	11,536,000
Finite-Lived Intangible Assets, Accumulated Amortization	(5,594,000)	(4,670,000)
Total estimated future amortization expense	5,942,000	6,866,000
Order or Production Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,127,000	2,127,000
Finite-Lived Intangible Assets, Accumulated Amortization	(2,127,000)	(2,127,000)
Total estimated future amortization expense	$ 0	$ 0