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Derivatives - Effect of Derivative Instruments on Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Effect of derivative instruments on results of operations        
Pre-tax Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives $ 2,245 $ (336) $ 6,941 $ 363
Interest expense        
Effect of derivative instruments on results of operations        
Pre-tax Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) $ (39) $ (830) $ (513) $ (1,843)