Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Beginning balance at January 1	$ 338	$ 338	$ 339
Decreases in tax provisions for prior years			(1)
Gross unrecognized tax benefits at December 31	$ 338	$ 338	$ 338