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Derivatives (Interest Rate Swap) (Details) - Interest Rate Swap - Fixed [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Apr. 01, 2015
Senior Loans [Member]          
Derivative [Line Items]          
Derivative, Notional Amount         $ 220,000
Derivative, Fixed Interest Rate         4.85%
Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Effective portion of derivative gain (loss) recognized in other comprehensive income (loss) $ (3,211) $ 0 $ (3,222) $ 0