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Derivatives (Interest Rate Swap) (Details) - Interest Rate Swap - Fixed [Member] - Cash Flow Hedging [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Apr. 01, 2015
Derivative [Line Items]      
Effective portion of derivative gain (loss) recognized in other comprehensive income (loss) $ (3,219) $ 0  
Interest Expense [Member]      
Derivative [Line Items]      
Cash flow hedge loss to be reclassified within 12 months (2,300)    
Effective portion of derivative gain (loss) reclassified from accumulated other comprehensive loss into income $ (391) $ 0  
Senior Loans [Member]      
Derivative [Line Items]      
Derivative, Notional Amount     $ 220,000
Derivative, Fixed Interest Rate     4.85%