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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets, Net Of Amortization) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 33,199 $ 33,062
Less accumulated amortization (10,853) (9,824)
Intangible assets, net 22,346 23,238
Customer Lists And Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 26,243 26,166
Product Technologies [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 4,909 4,849
Trade Names and Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 1,100 1,100
Core Technologies [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 947 $ 947