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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative Instruments Gain Loss [Line Items]        
Fuel $ 48,992 $ 100,531 $ 174,016 $ 198,784
Depreciation and amortization 179,252 156,271 377,449 326,012
Interest expense, net 114,537 65,969 183,444 139,472
Other income (expense), net (14,418) 3,616 (8,595) 3,182
Cash Flow Hedging        
Derivative Instruments Gain Loss [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (28,782) 9,274 (50,781) 16,274
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 (13,878) 9,885 (20,095) 17,403
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 (11,964)   (26,284)  
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 (11,964)   (26,284)  
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 (1,266) (703) (2,395) (1,406)
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 $ (1,674) $ 92 $ (2,007) $ 277