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Derivative Instruments and Hedging Activities-Interest Rate Swaps (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Derivative [Line Items]      
Amount of loss recognized in OCI on derivative (effective portion) $ 919 $ 1,292  
Accrued expenses and accounts payable      
Derivative [Line Items]      
Interest rate derivative at fair value 1,161   $ 553
Cash Flow Hedging | Interest Expense | Interest Rate Swap      
Derivative [Line Items]      
Amount of loss reclassified from accumulated OCI into income (effective portion) $ 311 $ 435