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Goodwill And Intangible Assets (Summary Of Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 24,323 |  | $ 37,797
Less: Accumulated amortization | (20,629) |  | (30,428)
Net intangible assets other than goodwill | 3,694 | $ 3,827 | 7,369
Beneficial Leases [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 15,069 |  | 28,592
Less: Accumulated amortization | (14,260) |  | (24,145)
Net intangible assets other than goodwill | 809 |  | 4,447
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 7,255 |  | 7,254
Less: Accumulated amortization | (5,269) |  | (5,207)
Net intangible assets other than goodwill | 1,986 |  | 2,047
Other Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 1,999 |  | 1,951
Less: Accumulated amortization | (1,100) |  | (1,076)
Net intangible assets other than goodwill | $ 899 |  | $ 875

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