Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 26,463	$ 26,273
Less: accumulated amortization	(22,708)	(22,285)
Less: impairment charges	(17)	(17)
Net intangible assets other than goodwill	3,738	3,971
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,396	12,451
Less: accumulated amortization	(10,471)	(10,375)
Net intangible assets other than goodwill	1,925	2,076
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,058	9,058
Less: accumulated amortization	(7,518)	(7,377)
Net intangible assets other than goodwill	1,540	1,681
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	5,009	4,764
Less: accumulated amortization	(4,719)	(4,533)
Less: impairment charges	(17)	(17)
Net intangible assets other than goodwill	$ 273	$ 214