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Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments - Interest rate swaps - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair Value Asset    
Derivative assets $ 336 $ 7,307
Derivative liability (1,574) 0
Other current assets    
Fair Value Asset    
Derivative assets 336 3,185
Other assets    
Fair Value Asset    
Derivative assets $ 0 $ 4,122