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Derivative Instruments - Interest Rate Cap Contracts (Details) - Interest rate cap agreements - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
LIBOR      
Interest rate derivatives      
Interest rate cap on floating rate debt (as a percent) 3.00%    
Cash flow hedge      
Cash flow hedge activity      
Ineffectiveness recorded $ 0 $ 0  
Cash flow hedge | Interest expense      
Cash flow hedge activity      
Expense recognized 201 $ 82  
Designated as Hedge      
Interest rate derivatives      
Notional amount $ 540,000   $ 540,000