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)

v3.19.3
Fair Value Measurements and Derivatives - Effects of cash flow hedge accounting on consolidated statements of operations (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments Gain Loss [Line Items]        
Fuel $ 98,943 $ 99,643 $ 297,727 $ 288,286
Depreciation and amortization 156,215 143,700 482,227 415,648
Interest expense, net 60,188 69,540 199,660 202,226
Cash Flow Hedging        
Derivative Instruments Gain Loss [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income 448 10,706 16,722 19,214
Cash Flow Hedging | Fuel contracts | Fuel        
Derivative Instruments Gain Loss [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income 1,657 11,595 19,060 23,024
Cash Flow Hedging | Foreign currency contracts | Depreciation and amortization expense        
Derivative Instruments Gain Loss [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income (703) (703) (2,108) (2,761)
Cash Flow Hedging | Interest rate contracts | Interest expense, net        
Derivative Instruments Gain Loss [Line Items]        
Amount of gain or (loss) reclassified from accumulated other comprehensive income (loss) into income $ (506) $ (186) $ (230) $ (1,049)