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Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Derivative [Line Items]          
Net gain on derivative instruments $ (96) $ (639) $ (347) $ (969)  
May 9, 2016 [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 2.02%   2.02%    
Market Value (Liability) $ (507)   $ (507)   $ (1,071)
Derivative Liability, Notional Amount $ 52,500   $ 52,500   58,125
June 30, 2017 [Member] [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 1.1825%   1.1825%    
Market Value (Liability) $ (565)   $ (565)   (348)
Derivative Liability, Notional Amount $ 52,500   $ 52,500   $ 58,125