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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
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 for income taxes at the statutory rate | $ (1,539) | $ 93,724 | $ 76,926
State income tax provision, net of federal income tax benefit | 173 | 15,645 | 12,711
Non-deductible expenses | 2,539 | 3,934 | 1,956
Valuation allowance changes affecting the provision for income taxes | (892) | (517) | (1,187)
Foreign income taxes, net of federal & state benefit |  |  | 1,192
Excess tax benefits from share based compensation | (1,434) | (3,525) | (4,548)
Other, net | 2,341 | (3,055) | (1,108)
Provision for income taxes | 1,188 | 106,206 | 85,942
Deferred tax assets: |  |  |
Accrued benefits | 19,668 | 20,848 |
Net operating loss carryforward | 229,815 | 358,685 |
AMT credit carryforward |  | 4,397 |
Aircraft credits | 12,765 | 9,114 |
Deferred revenue | 27,076 |  |
Accrued reserves and other | 34,816 | 17,225 |
Total deferred tax assets | 324,140 | 410,269 |
Valuation allowance |  | (892) |
Deferred tax liabilities: |  |  |
Accelerated depreciation | (950,071) | (1,032,957) |
Total deferred tax liabilities | (950,071) | (1,032,957) |
Net deferred tax liability | (625,931) | (623,580) |
Accounting Standards Update 2016-09 |  |  |
Reconciliation |  |  |
Benefit from share-based compensation | 1,400 | 3,500 | 4,500
ExpressJet | State |  |  |
Reconciliation |  |  |
Valuation allowance | $ 900 | $ 500 | $ 1,200

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