Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,130	$ 11,130
Accumulated Amortization	(3,951)	(3,407)
Net Carrying Amount	7,179	7,723
Trademarks And Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,786	1,786
Accumulated Amortization	(1,552)	(1,411)
Net Carrying Amount	234	375
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,344	9,344
Accumulated Amortization	(2,399)	(1,996)
Net Carrying Amount	$ 6,945	$ 7,348