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Derivative Instruments And Hedging Activities (Schedule Of Derivative Instruments In Consolidated Statements Of Operations) (Details) - Cash Flow Interest Rate Contracts [Member] - Interest Expense [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Gain/(Loss) Recognized in OCI (Effectiveness) $ (3,876) $ 1,085 $ 6,383
Gain/(Loss) Reclassified From OCI Into Income $ 4,947 $ (635) (5,444)
Loss Recognized Due to Ineffectiveness     $ 30