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
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments Gain Loss [Line Items]    
Fuel $ 125,024 $ 98,253
Depreciation and amortization 198,197 169,741
Interest expense, net 68,907 73,503
Other income (expense), net 5,823 (434)
Cash Flow Hedging    
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (21,999) 7,000
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 (6,217) 7,518
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 (14,320)  
Cash Flow Hedging | Fuel contracts | Other (Income) Expense, net    
Derivative Instruments Gain Loss [Line Items]    
Other income (expense), net (14,320)  
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 (1,129) (703)
Cash Flow Hedging | Interest Rate Swap [Member] | Interest expense, net    
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income $ (333) $ 185