Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 26,511	$ 26,273
Less: accumulated amortization	(22,497)	(22,285)
Less: impairment charges	(17)	(17)
Net intangible assets other than goodwill	3,997	3,971
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,426	12,451
Less: accumulated amortization	(10,393)	(10,375)
Net intangible assets other than goodwill	2,033	2,076
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,058	9,058
Less: accumulated amortization	(7,448)	(7,377)
Net intangible assets other than goodwill	1,610	1,681
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,027	4,764
Less: accumulated amortization	(4,656)	(4,533)
Less: impairment charges	(17)	(17)
Net intangible assets other than goodwill	$ 354	$ 214