Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Interest Expense [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	[1]	$ 600	$ (587)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		$ 565	$ (565)

[1] There were no gains or losses recognized in earnings related to any ineffective portion of the hedging relationship or related to any amount excluded from the assessment of hedge effectiveness for the years ended December 31, 2017 and 2016.