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Derivative Instruments and Hedging Activities-Interest Rate Swaps (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Derivative [Line Items]          
Amount of loss recognized in OCI on derivative (effective portion) $ 338 $ 230 $ 1,258 $ 1,522  
Amount of loss reclassified from accumulated OCI into income (effective portion)     614 $ 869  
Accrued expenses and accounts payable          
Derivative [Line Items]          
Interest rate derivative at fair value 1,197   $ 1,197   $ 553
Cash Flow Hedging | Interest Expense | Interest Rate Swap          
Derivative [Line Items]          
Amount of loss reclassified from accumulated OCI into income (effective portion) $ 302 $ 434