Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Details)

v3.20.4
Fair Value Measurements and Derivatives - Effects of Derivatives Designated as Cash Flow Hedges (Details) - Cash Flow Hedging - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Other Comprehensive Income $ (51,642) $ (123,015) $ (161,214)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (106,670) 8,898 30,096
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
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)
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)
Fuel contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Other Comprehensive Income (157,669) 46,154 (52,949)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (49,653)    
Fuel contracts | Fuel      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (45,488)    
Foreign currency contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Other Comprehensive Income 116,496 (163,197) (108,911)
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)    
Interest rate contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Other Comprehensive Income (10,469) $ (5,972) $ 646
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)