Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Costs incurred to acquire, develop and extend patents	$ 336	$ 302	$ 223
Intangible assets, gross	99,703	59,204
Increased acquired technology	49
Accumulated amortization decreased	41
Intangible assets, net	54,040	18,275
Annual estimated amortization expense, in 2012	7,093
Annual estimated amortization expense, in 2013	7,004
Annual estimated amortization expense, in 2014	6,981
Annual estimated amortization expense, in 2015	6,826
Annual estimated amortization expense, in 2016	5,680
Capitalized Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	237	474	829
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	11,015	11,064
Intangible assets, net	670	760
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	4,588	928	175
Intangible assets, net	50,837	14,851
Intangible assets, acquired during period	$ 40,832	$ 16,108