Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Effects of Cash Flow Hedge Accounting on Consolidated Statements of Operations (Details)

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Fair Value Measurements and Derivatives - Effects of Cash Flow Hedge Accounting on Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments Gain Loss [Line Items]        
Fuel $ 48,224 $ 98,943 $ 222,240 $ 297,727
Depreciation and amortization 177,488 156,215 554,937 482,227
Interest expense, net 139,664 60,188 323,108 199,660
Other income (expense), net (23,680) 10,251 (32,275) 13,433
Cash Flow Hedging        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (36,072) 448 (86,853) 16,722
Cash Flow Hedging | Fuel contracts | Fuel        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (15,091) 1,657 (35,186) 19,060
Cash Flow Hedging | Fuel contracts | Other income (expense), net        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (17,434)   (43,718)  
Amount of gain recognized in income as a result of failing effectiveness tests 5,507   5,507  
Cash Flow Hedging | Fuel contracts | Other (Income) Expense, net        
Derivative Instruments Gain Loss [Line Items]        
Amount of loss reclassified from accumulated other comprehensive income (loss) into income as a result that a forecasted transaction is no longer probable of occurring (17,434)   (43,718)  
Cash Flow Hedging | Foreign currency contracts | Depreciation and amortization        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (1,267) (703) (3,662) (2,108)
Cash Flow Hedging | Interest rate swap | Interest expense, net        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income $ (2,280) $ (506) $ (4,287) $ (230)