Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 37,253	$ 37,009
Less: Accumulated amortization	(28,711)	(26,972)
Net intangible assets other than goodwill	8,542	10,037	[1]
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,860	28,671
Less: Accumulated amortization	(23,292)	(21,870)
Net intangible assets other than goodwill	5,568	6,801
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,254	7,254
Less: Accumulated amortization	(4,936)	(4,634)
Net intangible assets other than goodwill	2,318	2,620
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,139	1,084
Less: Accumulated amortization	(483)	(468)
Net intangible assets other than goodwill	$ 656	$ 616

[1] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).