Goodwill And Other Intangible Assets (Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in Years)	8	8
Gross	$ 55,358	$ 55,837
Accumulated Amortization	(42,465)	(40,374)
Net	12,893	15,463
Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in Years)	10	10
Gross	6,951	7,088
Accumulated Amortization	(5,028)	(4,441)
Net	1,923	2,647
Patents And Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in Years)	11	11
Gross	18,507	18,647
Accumulated Amortization	(8,057)	(6,509)
Net	10,450	12,138
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in Years)	6	6
Gross	29,900	30,102
Accumulated Amortization	(29,380)	(29,424)
Net	$ 520	$ 678