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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statutory Federal income tax rate (as a percent) | 21.00% | 21.00% | 35.00%
Reconciliation |  |  |
Computed provision for income taxes at the statutory rate | $ 93,724 | $ 76,926 | $ 100,864
State income tax provision, net of federal income tax benefit | 15,645 | 12,711 | 7,778
Non-deductible expenses | 3,934 | 1,956 | 3,230
Valuation allowance changes affecting the provision for income taxes | (517) | (1,187) | 505
Foreign income taxes, net of federal & state benefit |  | 1,192 |
Excess tax benefits from share based compensation | (3,525) | (4,548) | (5,377)
Revaluation of net deferred taxes for the Tax Cuts and Jobs Act of 2017 |  |  | (246,845)
Other, net | (3,055) | (1,108) | (879)
Provision (benefit) for income taxes | 106,206 | 85,942 | (140,724)
Deferred tax assets: |  |  |
Accrued benefits | 20,848 | 32,462 |
Net operating loss carryforward | 358,685 | 344,375 |
AMT credit carryforward | 4,397 | 15,744 |
Aircraft credits | 9,114 | 35,924 |
Accrued reserves and other | 17,225 | 18,710 |
Total deferred tax assets | 410,269 | 447,215 |
Valuation allowance | (892) | (9,455) |
Deferred tax liabilities: |  |  |
Accelerated depreciation | (1,032,957) | (955,919) |
Total deferred tax liabilities | (1,032,957) | (955,919) |
Net deferred tax liability | (623,580) | (518,159) |
Accounting Standards Update 2016-09 |  |  |
Reconciliation |  |  |
Benefit from share-based compensation | 3,500 | 4,500 | 5,400
ExpressJet | State |  |  |
Reconciliation |  |  |
Valuation allowance | $ 500 | $ 1,200 | $ 500

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