Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Fair Value Measurements and Derivatives - Effects of Cash Flow Hedge Accounting on Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments Gain Loss [Line Items]      
Fuel $ 264,712 $ 409,602 $ 392,685
Depreciation and amortization 717,840 646,188 561,060
Interest expense, net 482,313 272,867 270,404
Other income (expense), net (33,599) 6,155 20,653
Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (106,670) 8,898 30,096
Fuel   409,602 392,685
Depreciation and amortization   646,188 561,060
Interest expense, net   (272,867) 270,404
Cash Flow Hedging | Fuel      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (45,488) 14,093 34,410
Cash Flow Hedging | Depreciation and amortization      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (4,929) (3,062) (3,463)
Cash Flow Hedging | Interest expense, net      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (6,600) (2,133) (851)
Cash Flow Hedging | Fuel contracts      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (49,653)    
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 (45,488)    
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 (49,653)    
Amount of gain recognized in income as a result of failing effectiveness tests 5,507    
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 (4,929)    
Cash Flow Hedging | Interest rate contracts | Interest expense, net      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income $ (6,600)    
Designated as Hedging Instrument | Cash Flow Hedging | Fuel contracts      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income   14,093 34,410
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency contracts      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income   (3,062) (3,463)
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate contracts      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income   $ (2,133) $ (851)