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 3)

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Fair Value Measurements and Derivatives - Effects of cash flow hedge accounting on consolidated statements of operations (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments Gain Loss [Line Items]      
Fuel $ 392,685 $ 361,032 $ 335,174
Depreciation and amortization 561,060 509,957 432,495
Interest expense, net (270,404) (267,804) (276,859)
Cash Flow Hedging      
Derivative Instruments Gain Loss [Line Items]      
Fuel 392,685 361,032 335,174
Depreciation and amortization 561,060 509,957 432,495
Interest expense, net 270,404 267,804 276,859
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income 30,096 (36,795) (95,969)
Cash Flow Hedging | Fuel contracts | Fuel | Designated as Hedging Instrument      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income 34,410 (29,721) (88,442)
Cash Flow Hedging | Fuel contracts | Other (Income) Expense, net | Designated as Hedging Instrument      
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     (2,994)
Cash Flow Hedging | Foreign currency contracts | Depreciation and amortization | Designated as Hedging Instrument      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (3,463) (4,077) (3,581)
Cash Flow Hedging | Interest rate contracts | Interest expense, net | Designated as Hedging Instrument      
Derivative Instruments Gain Loss [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income $ (851) $ (2,997) $ (3,946)