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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statutory Federal income tax rate (as a percent) | 21.00% | 35.00% |  | 35.00% |
Reconciliation |  |  |  |  |
Computed provision (benefit) for income taxes at the statutory rate | $ 76,926 | $ 100,864 |  | $ (87,084) |
State income tax provision (benefit), net of federal income tax benefit | 12,711 | 7,778 |  | (5,768) |
Non-deductible expenses | 1,956 | 3,230 |  | 3,552 |
Valuation allowance changes affecting the provision for income taxes | (1,187) | 505 |  | 751 |
Foreign income taxes, net of federal & state benefit | 1,192 |  |  |  |
Excess tax benefits from share based compensation | (4,548) | (5,377) |  |  |
Revaluation of net deferred tax liabilities for the Tax Act |  | (246,845) |  |  |
Other, net | (1,108) | (879) |  | 1,323 |
Provision (benefit) for income taxes | 85,942 | (140,724) | [1] | (87,226) | [1]
Unrecorded tax benefits | 14,553 | 2,223 |  |  |
Deferred tax assets: |  |  |  |  |
Accrued benefits | 32,462 | 31,651 |  |  |
Net operating loss carryforward | 344,375 | 122,648 |  |  |
AMT credit carryforward | 15,744 | 23,443 |  |  |
Aircraft credits | 35,924 | 53,870 |  |  |
Accrued reserves and other | 18,710 | 26,647 |  |  |
Total deferred tax assets | 447,215 | 258,259 |  |  |
Valuation allowance | (9,455) | (10,642) |  |  |
Deferred tax liabilities: |  |  |  |  |
Accelerated depreciation | (955,919) | (666,637) |  |  |
Total deferred tax liabilities | (955,919) | (666,637) |  |  |
Net deferred tax liability | (518,159) | (419,020) |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |
Reconciliation |  |  |  |  |
Benefit from share-based compensation | 4,500 | 5,400 |  |  |
ExpressJet | State |  |  |  |  |
Reconciliation |  |  |  |  |
Valuation allowance | $ 1,200 | $ 500 |  | $ 800 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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