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Fair Value Measurements and Derivative Instruments - Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments        
Amount of gain (loss) recognized in income on derivatives $ (4,067) $ (37,562) $ 713 $ (29,750)
Foreign currency forward contracts | Other income (expense)        
Derivative Instruments        
Amount of gain (loss) recognized in income on derivatives (4,168) (36,894) 846 (31,259)
Fuel swaps | Other income (expense)        
Derivative Instruments        
Amount of gain (loss) recognized in income on derivatives (21) 213 (119) 183
Fuel swaps | Fuel cost        
Derivative Instruments        
Amount of gain (loss) recognized in income on derivatives $ 122 $ (881) $ (14) $ 1,326