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Fair Value Measurements and Derivative Instruments (Designated Cash Flow Hedges) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | $ (41,109) | $ (146,108) |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | (79,119) | 5,205 |
Interest expense |  |  |  |  |  |  |  |  | (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)
Net Income (loss) | $ (1,366,935) | $ (1,346,756) | $ (1,639,292) | $ (1,444,479) | $ 273,136 | $ 883,240 | $ 472,830 | $ 249,681 | (5,797,462) | 1,878,887 | 1,811,042
Interest rate swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | (112,960) | (72,732) |
Interest rate swaps | Interest Income (Expense) |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | (25,267) | (4,289) |
Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | 130,426 | (148,881) |
Foreign currency forward contracts | Depreciation and Amortization Expenses |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | (14,679) | (14,063) |
Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency forward contracts | Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | (7,315) | (5,080) |
Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency forward contracts | Other indirect operating expenses |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency collar options |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | 0 | 0 |
Foreign currency collar options | Depreciation and Amortization Expenses |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | 0 | 0 |
Fuel swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | 0 | 0 |
Fuel swaps | Other income (expense) |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | 3,549 | (1,292) |
Fuel swaps | Fuel |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | (35,407) | 29,929 |
Fuel swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  | (58,575) | 75,505 |
Fuel swaps | Fuel |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  | (35,407) | 29,929 |
Cash flow hedge |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | (297,994)
Cash flow hedge | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | 18,578
Cash flow hedge | Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | (222,645)
Cash flow hedge | Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | 0
Cash flow hedge | Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | 0
Cash flow hedge | Foreign currency collar options |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | 0
Cash flow hedge | Fuel swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | 0
Cash flow hedge | Fuel swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative |  |  |  |  |  |  |  |  |  |  | (93,927)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Net Income (loss) |  |  |  |  |  |  |  |  |  |  | (11,133)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | (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 |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
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: | Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) |  |  |  |  |  |  |  |  |  |  | 12,855
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Foreign currency forward contracts |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Other indirect operating expenses |  |  |  |  |  |  |  |  |  |  | 0
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Foreign currency collar options |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  |  | 0
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Fuel swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) |  |  |  |  |  |  |  |  | 3,549 | (1,292) | (1,580)
Fuel |  |  |  |  |  |  |  |  | $ (35,407) | $ 29,929 | 1,366
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Fuel swaps |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |
Fuel |  |  |  |  |  |  |  |  |  |  | $ 1,366

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