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Intangible Assets (Schedule Of Intangible Assets Excluding Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Intangible Assets [Abstract]    
Product technology $ 10,009 $ 10,501
Patents 7,287 6,523
Other 7,535 7,539
Total 24,831 24,563
Accumulated amortization (17,982) (17,359)
Intangible assets - net $ 6,849 $ 7,204