Goodwill And Other Intangible Assets (Schedule Of Intangible Assets, Net Of Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 33,122	$ 32,917
Less accumulated amortization	(19,512)	(17,101)
Intangible assets, net	13,610	15,816
Customer Lists And Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	26,109	25,995
Product Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	4,803	4,712
Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,263	1,263
Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 947	$ 947