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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Gain/(Loss) Recognized in OCI (Effectiveness) $ 6,383 $ (2,137) $ (2,576)
Loss Reclassified From OCI Into Income 5,444 $ 3,824 $ 6,068
Loss Recognized Due to Ineffectiveness $ 30