Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 37,797	$ 37,253
Less: Accumulated amortization	(30,428)	(28,711)
Net intangible assets other than goodwill	7,369	8,542
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,592	28,860
Less: Accumulated amortization	(24,145)	(23,292)
Net intangible assets other than goodwill	4,447	5,568
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,254	7,254
Less: Accumulated amortization	(5,207)	(4,936)
Net intangible assets other than goodwill	2,047	2,318
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,951	1,139
Less: Accumulated amortization	(1,076)	(483)
Net intangible assets other than goodwill	$ 875	$ 656