Goodwill And Intangible Assets (Summary Of Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization	$ 300	$ 406
Beneficial Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization	207	304
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization	$ 93	$ 102