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Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Effect of derivative instruments on results of operations    
Interest expense $ 23,617 $ 22,547
Accumulated Other Comprehensive Income (Loss) | Reclassification adjustments    
Effect of derivative instruments on results of operations    
Interest expense $ (926) $ 54