Goodwill And Intangible Assets (Summary Of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization	$ 382	$ 874	$ 1,246	$ 1,813
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization	278	578	935	968
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization	$ 104	$ 296	$ 311	$ 845