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Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Derivative [Line Items]          
Pre-tax (charge) on derivative instruments $ 264 $ 31 $ 251 $ 330  
Net gain on derivative instruments     $ (251) $ (330)  
May 9, 2016 [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 2.02%   2.02%    
Market Value (Liability) $ (713)   $ (713)   $ (1,071)
Derivative Liability, Notional Amount $ 54,375   $ 54,375   58,125
June 30, 2017 [Member] [Member] | Swap [Member]          
Derivative [Line Items]          
Stated Interest Rate 1.1825%   1.1825%    
Market Value (Liability) $ (456)   $ (456)   (348)
Derivative Liability, Notional Amount $ 54,375   $ 54,375   $ 58,125