Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 25,451		$ 37,797
Less: accumulated amortization	(21,131)		(30,428)
Net intangible assets other than goodwill	4,320	$ 3,827	7,369
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	15,048		28,592
Less: accumulated amortization	(14,496)		(24,145)
Net intangible assets other than goodwill	552		4,447
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,258		7,254
Less: accumulated amortization	(5,449)		(5,207)
Net intangible assets other than goodwill	1,809		2,047
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	3,145		1,951
Less: accumulated amortization	(1,186)		(1,076)
Net intangible assets other than goodwill	$ 1,959		$ 875