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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statutory Federal income tax rate (as a percent) | 21.00% | 21.00% | 21.00% |
Reconciliation |  |  |  |
Computed provision (benefit) for income taxes at the statutory rate | $ 31,628 | $ (1,539) | $ 93,724 |
State income tax provision, net of federal income tax benefit | 6,247 | 173 | 15,645 |
Non-deductible expenses | 1,007 | 2,539 | 3,934 |
Valuation allowance changes affecting the provision for income taxes |  | (892) | (517) |
Excess tax benefits from share based compensation | (92) | (1,434) | (3,525) |
Other, net | (90) | 2,341 | (3,055) |
Provision for income taxes | 38,700 | 1,188 | 106,206 |
Deferred tax assets: |  |  |  |
Accrued benefits | 21,401 | 19,668 |  |
Net operating loss carryforward | 175,659 | 229,815 |  |
Aircraft credits | 22,265 | 10,767 |  |
Deferred revenue | 25,405 | 27,076 |  |
Operating lease liabilities | 57,991 | 70,541 |  |
Accrued reserves and other | 31,431 | 34,816 |  |
Total deferred tax assets | 334,152 | 392,683 |  |
Deferred tax liabilities: |  |  |  |
Accelerated depreciation | (940,867) | (950,071) |  |
Operating lease right-of-use assets | (56,521) | (68,543) |  |
Total deferred tax liabilities | (997,388) | (1,018,614) |  |
Net deferred tax liability | $ (663,236) | (625,931) |  |
Accounting Standards Update 2016-09 |  |  |  |
Reconciliation |  |  |  |
Benefit from share-based compensation |  | 100 | 1,400 | $ 3,500
ExpressJet [Member] | State and Local Jurisdiction [Member] |  |  |  |
Reconciliation |  |  |  |
Valuation allowance |  | $ 900 | $ 500 |

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