Intangible Assets (Schedule Of Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 9,344	$ 9,344
Accumulated Amortization	(5,221)	(3,611)
Net Carrying Amount	4,123	5,733
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,344	9,344
Accumulated Amortization	(5,221)	(3,611)
Net Carrying Amount	$ 4,123	$ 5,733