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