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Goodwill And Other Intangible Assets (Schedule Of Intangible Assets, Net Of Amortization) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 33,062 $ 16,980
Less accumulated amortization (9,824) (7,211)
Intangible assets, net $ 23,238 $ 9,769
Weighted average useful life 14 years 4 months 24 days 14 years 10 months 24 days
Customer Lists And Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 26,166 $ 13,942
Less accumulated amortization (7,841) (5,843)
Intangible assets, net $ 18,325 $ 8,099
Weighted average useful life 15 years 1 month 6 days 15 years 3 months 18 days
Product Technologies [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 4,849 $ 2,091
Less accumulated amortization (1,203) (745)
Intangible assets, net $ 3,646 $ 1,346
Weighted average useful life 12 years 14 years
Trade Names and Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 1,100  
Less accumulated amortization (62)  
Intangible assets, net $ 1,038  
Weighted average useful life 10 years  
Core Technologies [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 947 $ 947
Less accumulated amortization (718) (623)
Intangible assets, net $ 229 $ 324
Weighted average useful life 10 years 10 years