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Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 29,975 $ 29,931
Accumulated Amortization (16,617) (16,008)
Net Carrying Amount 13,358 13,923
Customer Relationships [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 17,807 17,763
Accumulated Amortization (9,382) (8,916)
Net Carrying Amount 8,425 8,847
Technology Licenses [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 11,300 11,300
Accumulated Amortization (7,111) (6,974)
Net Carrying Amount 4,189 4,326
Other Intangible Assets [Member]
    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 868 868
Accumulated Amortization (124) (118)
Net Carrying Amount $ 744 $ 750