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Commitments and Contingencies - Commitments and Obligations (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Operating lease payments for aircraft and facility obligations |  |
Oct - Dec 2018 | $ 25,327 |
2019 | 83,268 |
2020 | 98,790 |
2021 | 90,378 |
2022 | 72,438 |
Thereafter | 125,570 |
Total | 495,771 |
Firm aircraft and spare engine commitments |  |
Oct - Dec 2018 | 211,485 |
2019 | 27,500 |
2020 | 27,500 |
2021 | 86,440 |
Total | 352,925 |
Interest commitments |  |
Oct - Dec 2018 | 60,498 |
2019 | 111,075 |
2020 | 96,051 |
2021 | 82,139 |
2022 | 69,227 |
Thereafter | 181,423 |
Total | 600,413 |
Principal maturities on long-term debt |  |
October - 2018 | 90,653 |
2019 | 360,599 |
2020 | 342,080 |
2021 | 336,897 |
2022 | 342,439 |
Thereafter | 1,662,100 |
Total | 3,134,768 | $ 2,712,350
Total commitments and obligations |  |
Oct - Dec 2018 | 387,963 |
2019 | 582,442 |
2020 | 564,421 |
2021 | 595,854 |
2022 | 484,104 |
Thereafter | 1,969,093 |
Total | $ 4,583,877 |
Variable interest rate (as percent) | 1.00% |

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