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Fair Value Measurements and Derivative Instruments (Designated Cash Flow Hedges) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 |  |  |  |  |  |  |  |  |  | $ (146,108) | $ (297,994) |
Amount of gain or (loss) reclassified from accumulated other comprehensive loss into income |  |  |  |  |  |  |  |  |  | 5,205 | (11,133) |
Interest expense |  |  |  |  |  |  |  |  |  | (408,513) | (333,672) | $ (299,982)
Depreciation and amortization expenses |  |  |  |  |  |  |  |  | $ (951,194) | (1,245,942) | (1,033,697) | (951,194)
Other Income (Expense) |  |  |  |  |  |  |  |  | (5,289) | (24,513) | 11,107 | (5,289)
Fuel |  |  |  |  |  |  |  |  | $ (681,118) | (697,962) | (710,617) |
Net Income | $ 273,136 | $ 883,240 | $ 472,830 | $ 249,681 | $ 315,703 | $ 810,391 | $ 466,295 | $ 218,653 |  | 1,878,887 | 1,811,042 | 1,625,133
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 |  |  |  |  |  |  |  |  |  | (72,732) | 18,578 |
Interest rate swaps | Interest 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 |  |  |  |  |  |  |  |  |  | (4,289) | (10,931) |
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 |  |  |  |  |  |  |  |  |  | (148,881) | (222,645) |
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 |  |  |  |  |  |  |  |  |  | (14,063) | (12,843) |
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 |  |  |  |  |  |  |  |  |  | (5,080) | 12,855 |
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 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 |
Fuel 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 |  |  |  |  |  |  |  |  |  | (1,292) | (1,580) |
Fuel contracts | 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 |  |  |  |  |  |  |  |  |  | 29,929 | 1,366 |
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 |  |  |  |  |  |  |  |  |  | 75,505 | (93,927) |
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 |  |  |  |  |  |  |  |  |  | 29,929 | 1,366 |
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 |  |  |  |  |  |  |  |  |  |  |  | 381,865
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 |  |  |  |  |  |  |  |  |  |  |  | (13,312)
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 |  |  |  |  |  |  |  |  |  |  |  | 276,573
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 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 | 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 |  |  |  |  |  |  |  |  |  |  |  | 118,604
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 |  |  |  |  |  |  |  |  |  |  |  | (188,630)
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 |  |  |  |  |  |  |  |  |  | (4,289) | (10,931) | (31,603)
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 |  |  |  |  |  |  |  |  |  | (14,063) | (12,843) | (10,840)
Other Income (Expense) |  |  |  |  |  |  |  |  |  | (5,080) | 12,855 | (9,472)
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) |  |  |  |  |  |  |  |  |  |  |  | (9,472)
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 | 0 | (2,408)
Reclassification out of accumulated other comprehensive income (loss) | Gain (loss) on cash flow derivative hedges: | Fuel contracts |  |  |  |  |  |  |  |  |  |  |  |
Effect of derivative instruments involved in fair value hedging on the consolidated financial statements |  |  |  |  |  |  |  |  |  |  |  |
Other Income (Expense) |  |  |  |  |  |  |  |  |  | (1,292) | (1,580) | 7,382
Fuel |  |  |  |  |  |  |  |  |  | $ 29,929 | $ 1,366 | (141,689)
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 |  |  |  |  |  |  |  |  |  |  |  | $ (141,689)

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