Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 26,351	$ 26,273
Less: accumulated amortization	(22,864)	(22,285)
Less: impairment charges	(17)	(17)
Net intangible assets other than goodwill	3,470	3,971
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,326	12,451
Less: accumulated amortization	(11,990)	(10,375)
Net intangible assets other than goodwill	336	2,076
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,058	9,058
Less: accumulated amortization	(7,589)	(7,377)
Net intangible assets other than goodwill	1,469	1,681
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,967	4,764
Less: accumulated amortization	(3,285)	(4,533)
Less: impairment charges	(17)	(17)
Net intangible assets other than goodwill	$ 1,665	$ 214