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Derivative Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 09, 2016
Derivative [Line Items]        
Pre-tax (charge) on derivative instruments $ (18,107) $ 920 $ 1,096  
Net (gain) loss on financial instruments $ (969) (920) $ (1,096)  
May 9, 2016 [Member] | Swap [Member]        
Derivative [Line Items]        
Stated Interest Rate 2.02%      
Market Value (Liability) $ 0 (247)    
Derivative Liability, Notional Amount $ 0 50,625    
June 30, 2017 [Member] [Member] | Swap [Member]        
Derivative [Line Items]        
Stated Interest Rate 1.1825%      
Market Value (Liability) $ (77) (252)    
Derivative Liability, Notional Amount $ 43,125 50,625    
May 5, 2021 [Member] [Member] [Member] | Swap [Member]        
Derivative [Line Items]        
Stated Interest Rate 0.00%     0.00%
Market Value (Liability) $ (547) 0    
Derivative Liability, Notional Amount $ 43,125 $ 0   $ 48,750