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Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Details) - Interest rate contracts - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivatives not designated as hedging instruments | Other income        
Derivative [Line Items]        
Amount of Gain (Loss) Recognized in Income on Derivative $ 211 $ 698
Derivatives designated as hedging instruments | Interest Expense        
Derivative [Line Items]        
Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion) $ (240) $ (317) $ (759) $ (959)