Goodwill And Other Intangible Asset Data (Amortized Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 37,883	$ 31,651
Accumulated Amortization	(25,216)	(21,896)
Net Amount	12,667	9,755
Amortization expense	3,320	3,211
Current Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,718	12,718
Accumulated Amortization	(11,403)	(10,863)
Net Amount	1,315	1,855
Patent And Patent Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	23,392	17,160
Accumulated Amortization	(12,079)	(9,351)
Net Amount	11,313	7,809
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	1,773	1,773
Accumulated Amortization	(1,734)	(1,682)
Net Amount	$ 39	$ 91