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Fair Value Measurements and Derivative Instruments - Designated Cash Flow Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Depreciation and amortization $ 292,285 $ 240,230  
Other income (expense) (5,088) (24,100)  
Fuel 160,171 160,341  
Net income 249,681 218,653  
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net [Abstract]      
Net inception fair value at January 1, 2019     $ (8,359)
Amount of gain recognized in income on derivatives for the period ended March 31, 2019 744    
Amount of loss remaining to be amortized in accumulated other comprehensive loss, as of March 31, 2019 (656)    
Fair value at March 31, 2019 (8,271)    
Cash flow hedge      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative 61,565 127,616  
Cash flow hedge | Interest rate swaps      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative (28,329) 37,191  
Cash flow hedge | Foreign currency forward contracts      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative (90,144) 95,366  
Cash flow hedge | Foreign currency forward contracts      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative 0 0  
Cash flow hedge | Fuel swaps      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative 0 0  
Cash flow hedge | Fuel Swap      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative 180,038 (4,941)  
Reclassification out of Accumulated Other Comprehensive Income      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Net income 12,534 (15,257)  
Reclassification out of Accumulated Other Comprehensive Income | Changes related to cash flow derivative hedges      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Net income 12,722 (14,914)  
Reclassification out of Accumulated Other Comprehensive Income | Changes related to cash flow derivative hedges | Interest rate swaps      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Interest expense, net of interest capitalized (391) (6,838)  
Reclassification out of Accumulated Other Comprehensive Income | Changes related to cash flow derivative hedges | Foreign currency forward contracts      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Depreciation and amortization (3,334) (3,312)  
Other income (expense) (1,315) 42  
Reclassification out of Accumulated Other Comprehensive Income | Changes related to cash flow derivative hedges | Foreign currency forward contracts      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Other income (expense) (1,315) 42  
Reclassification out of Accumulated Other Comprehensive Income | Changes related to cash flow derivative hedges | Fuel swaps      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Other income (expense) (256) 325  
Fuel 18,018 (5,131)  
Reclassification out of Accumulated Other Comprehensive Income | Changes related to cash flow derivative hedges | Fuel Swap      
Effect of derivative instruments involved in hedging on the consolidated financial statements      
Fuel $ 18,018 $ (5,131)