Derivative Financial Instruments (Schedule Of Gains And Losses Related To Derivative Instruments) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Unrealized loss on interest rate swaps		$ (437)	$ (1,609)	$ (356)
Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative [Line Items]
Unrealized loss on interest rate swaps	[1]	1,974	295
Cash Flow Hedging [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Unrealized loss on interest rate swaps		$ (2,411)	$ (1,609)

[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, 2020 and 2019.