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Accounting for Derivatives - Effect of Derivative Instruments on Income Statement (Details) - Interest rate swaps - Derivatives designated as cash flow hedges: - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Effect of derivative instruments on results of operations    
Pre-tax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives $ 699 $ (5,932)
Interest expense    
Effect of derivative instruments on results of operations    
Pre-tax Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) $ (1,013) $ (1,116)