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Derivatives - Effect of Derivative Instruments on Balance Sheet (Details) - Derivatives designated as hedging instruments - Interest rate swaps - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value Asset (Liability)    
Total derivatives $ 13,079 $ 4,542
Other current assets    
Fair Value Asset (Liability)    
Derivative assets 3,592 186
Other long-term assets    
Fair Value Asset (Liability)    
Derivative assets 9,487 4,490
Accrued liabilities    
Fair Value Asset (Liability)    
Derivative liabilities $ 0 $ (134)