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Fair Value Measurements and Derivative Instruments - Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Asset Derivatives    
Asset Derivatives $ 68,693 $ 19,397
Liability Derivatives    
Liability Derivatives 266,257 373,497
Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives [1] 68,180 18,854
Liability Derivatives    
Liability Derivatives [1] 253,367 356,029
Not Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives 513 543
Liability Derivatives    
Liability Derivatives 12,890 17,468
Interest rate swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 886 5,246
Interest rate swaps | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives [1] 54,726 57,679
Foreign currency forward contracts | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 37,299 0
Foreign currency forward contracts | Designated as Hedging Instrument | Prepaid Expenses and Other Assets    
Asset Derivatives    
Asset Derivatives [1] 16,137 0
Foreign currency forward contracts | Designated as Hedging Instrument | Derivative financial instruments    
Liability Derivatives    
Liability Derivatives [1] 1,127 5,574
Foreign currency forward contracts | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives [1] 3,758 68,165
Fuel swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 12,281 13,608
Fuel swaps | Designated as Hedging Instrument | Prepaid Expenses and Other Assets    
Asset Derivatives    
Asset Derivatives [1] 1,577 0
Fuel swaps | Designated as Hedging Instrument | Derivative financial instruments    
Liability Derivatives    
Liability Derivatives [1] 117,654 129,486
Fuel swaps | Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives [1] 76,102 95,125
Fuel swaps | Not Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives 440 543
Fuel swaps | Not Designated as Hedging Instrument | Prepaid Expenses and Other Assets    
Asset Derivatives    
Asset Derivatives 73 0
Fuel swaps | Not Designated as Hedging Instrument | Derivative financial instruments    
Liability Derivatives    
Liability Derivatives 9,320 11,532
Fuel swaps | Not Designated as Hedging Instrument | Other long-term Liabilities    
Liability Derivatives    
Liability Derivatives $ 3,570 $ 5,936
[1] Accounting Standard Codification 815-20 “Derivatives and Hedging.”