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Derivatives (Gains/(Losses) on Derivatives Associated with Cash Flow Hedges) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Gain/Loss expected to be reclassified to earnings in the next twelve months     $ (1,200)  
Cash Flow Hedge | Hedging Instruments And Hedged Items | Interest Rate Swap        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(Losses) $ (1,190) $ (2,545) $ (800) $ 5,061