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Changes in Accumulated Other Comprehensive Income (Loss) (Reclassifications) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense, net of interest capitalized | $ (844,238) | $ (408,513) | $ (333,672)
Depreciation and amortization expenses | (1,279,254) | (1,245,942) | (1,033,697)
Other income (Expense) | (137,085) | (24,513) | 11,107
Fuel | (371,015) | (697,962) | (710,617)
Reclassification out of accumulated other comprehensive income (loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications for the period | (150,230) | 4,426 | (12,620)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications for the period | (79,119) | 5,205 | (11,133)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Interest rate swaps |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest expense, net of interest capitalized | (25,267) | (4,289) | (10,931)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Foreign currency forward contracts |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Depreciation and amortization expenses | (14,679) | (14,063) | (12,843)
Other income (Expense) | (7,315) | (5,080) | 12,855
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Fuel swaps |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other income (Expense) | 3,549 | (1,292) | (1,580)
Fuel | (35,407) | 29,929 | 1,366
Reclassification out of accumulated other comprehensive income (loss) | Actuarial loss |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Payroll and related | (2,067) | (779) | (1,487)
Reclassification out of accumulated other comprehensive income (loss) | Prior service costs |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Payroll and related | 0 | 0 | 0
Reclassification out of accumulated other comprehensive income (loss) | Amortization of defined benefit plans: |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total reclassifications for the period | $ (2,067) | $ (779) | $ (1,487)

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