Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 26,123	$ 25,451
Less: Accumulated amortization	(21,779)	(21,131)
Net intangible assets other than goodwill	4,344	4,320
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,309	15,048
Less: Accumulated amortization	(10,237)	(14,496)
Net intangible assets other than goodwill	2,072	552
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,062	7,258
Less: Accumulated amortization	(7,301)	(5,449)
Net intangible assets other than goodwill	1,761	1,809
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,752	3,145
Less: Accumulated amortization	(4,241)	(1,186)
Net intangible assets other than goodwill	$ 511	$ 1,959