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Fair Value Measurements and Derivative Instruments - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Asset Derivatives    
Asset Derivatives $ 119,082 $ 65,297
Liability Derivatives    
Liability Derivatives 210,426 201,812
Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives [1] 118,706 58,576
Liability Derivatives    
Liability Derivatives [1] 210,149 199,795
Notional Disclosures    
Carrying Amount of the Hedged Liabilities 734,266 725,486
Cumulative amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Liabilities (16,306) (24,766)
Not Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives 376 6,721
Liability Derivatives    
Liability Derivatives 277 2,017
Interest rate swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 6,010 23,518
Interest rate swaps | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 43,351 40,467
Foreign currency forward contracts | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 5,838 10,844
Foreign currency forward contracts | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 6,605 4,044
Liability Derivatives    
Liability Derivatives [1] 80,989 39,665
Foreign currency forward contracts | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 58,929 16,854
Foreign currency forward contracts | Not Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives 0 1,579
Foreign currency forward contracts | Not Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives 0 1,751
Liability Derivatives    
Liability Derivatives 0 808
Foreign currency forward contracts | Not Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives 0 833
Fuel swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 46,783 9,204
Fuel swaps | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 53,470 10,966
Liability Derivatives    
Liability Derivatives [1] 7,757 37,627
Fuel swaps | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 19,123 65,182
Fuel swaps | Not Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives 0 587
Fuel swaps | Not Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives 376 2,804
Liability Derivatives    
Liability Derivatives 277 376
Fuel swaps | Not Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives $ 0 $ 0
[1] Accounting Standard Codification 815-20 “Derivatives and Hedging.”