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Derivative Financial Instruments (Details 3) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Notional Amount $ 350,371 $ 262,065
March 15, 2013 Interest Rate Swap    
Derivative [Line Items]    
Contract Date Mar. 15, 2013  
Notional Amount $ 45,000  
Fixed Rate 1.02%  
Effective Date Apr. 05, 2013  
Maturity Date Mar. 31, 2019  
March 29, 2013 Interest Rate Swap    
Derivative [Line Items]    
Contract Date Mar. 29, 2013  
Notional Amount $ 45,000  
Fixed Rate 0.97%  
Effective Date Apr. 05, 2013  
Maturity Date Mar. 31, 2019