Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 25,420	$ 25,451
Less: Accumulated amortization	(20,999)	(21,131)
Net intangible assets other than goodwill	4,421	4,320
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,044	15,048
Less: Accumulated amortization	(10,032)	(14,496)
Net intangible assets other than goodwill	2,012	552
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	9,062	7,258
Less: Accumulated amortization	(7,148)	(5,449)
Net intangible assets other than goodwill	1,914	1,809
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	4,314	3,145
Less: Accumulated amortization	(3,819)	(1,186)
Net intangible assets other than goodwill	$ 495	$ 1,959