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Changes in Accumulated Other Comprehensive (Loss) Income - Reclassifications (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassifications out of accumulated other comprehensive loss        
Interest expense, net of interest capitalized $ 86,510 $ 73,233 $ 236,252 $ 230,182
Depreciation and amortization 259,923 240,150 753,529 710,836
Other income (expense) 10,658 15,354 (35,435) (99,613)
Fuel 182,415 160,752 515,065 508,914
Net income 810,391 752,842 1,495,339 1,337,094
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income        
Reclassifications out of accumulated other comprehensive loss        
Net income (745) (43,605) (5,157) (152,169)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income        
Reclassifications out of accumulated other comprehensive loss        
Net income (373) (43,312) (4,071) (151,319)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Interest rate swaps        
Reclassifications out of accumulated other comprehensive loss        
Interest expense, net of interest capitalized (1,395) (7,860) (10,371) (24,580)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Foreign currency forward contracts        
Reclassifications out of accumulated other comprehensive loss        
Depreciation and amortization (3,157) (2,710) (9,625) (8,130)
Other income (expense) (835) (1,512) 13,808 (9,187)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Foreign currency collar options        
Reclassifications out of accumulated other comprehensive loss        
Depreciation and amortization 0 (602) 0 (1,806)
Loss on cash flow derivative hedges | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Fuel swaps        
Reclassifications out of accumulated other comprehensive loss        
Other income (expense) 466 1,758 658 6,533
Fuel 4,548 (32,386) 1,459 (114,149)
Actuarial loss        
Reclassifications out of accumulated other comprehensive loss        
Net income (372) (293) (1,086) (850)
Actuarial loss | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income        
Reclassifications out of accumulated other comprehensive loss        
Payroll and related $ (372) $ (293) $ (1,086) $ (850)