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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Effect of derivative instruments on results of operations        
Pre-tax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives $ (3,518) $ 255 $ (9,450) $ (5,998)
Interest expense        
Effect of derivative instruments on results of operations        
Pre-tax Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) $ (1,159) $ (2,016) $ (2,275) $ (3,691)