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Fair Value Measurements and Derivative Instruments (Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Asset Derivatives    
Asset Derivatives $ 65,297 $ 320,385
Liability Derivatives    
Liability Derivatives 201,812 115,961
Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives 58,576 298,963
Liability Derivatives    
Liability Derivatives 199,795 105,033
Not Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives 6,721 21,422
Liability Derivatives    
Liability Derivatives 2,017 10,928
Interest rate swaps | Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives 23,518 7,330
Interest rate swaps | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives 40,467 46,509
Foreign currency forward contracts | Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives 10,844 158,879
Foreign currency forward contracts | Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives 4,044 68,352
Liability Derivatives    
Liability Derivatives 39,665 0
Foreign currency forward contracts | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives 16,854 6,625
Foreign currency forward contracts | Not Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives 1,579 2,793
Foreign currency forward contracts | Not Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives 1,751 9,945
Liability Derivatives    
Liability Derivatives 808 2,933
Foreign currency forward contracts | Not Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives 833 1,139
Fuel contracts | Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives 9,204 51,265
Fuel contracts | Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives 10,966 13,137
Liability Derivatives    
Liability Derivatives 37,627 38,488
Fuel contracts | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives 65,182 13,411
Fuel contracts | Not Designated as Hedging Instrument | Other Assets    
Asset Derivatives    
Asset Derivatives 587 798
Fuel contracts | Not Designated as Hedging Instrument | Derivative Financial Instruments    
Asset Derivatives    
Asset Derivatives 2,804 7,886
Liability Derivatives    
Liability Derivatives 376 6,043
Fuel contracts | Not Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives $ 0 $ 813