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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statutory Federal income tax rate (as a percent) |  | 35.00% |  |
Reconciliation between the statutory federal income tax rate of 35% and the effective rate which is derived by dividing the provision for income taxes by income (loss) before income taxes |  |  |  |
Computed provision (benefit) for income taxes at the statutory rate |  | $ 100,864 | $ (87,084) | $ 68,013
State income tax provision (benefit), net of federal income tax benefit |  | 7,778 | (5,768) | 5,416
Non-deductible expenses |  | 3,230 | 3,552 | 3,641
Valuation allowance changes affecting the provision for income taxes |  | 505 | 751 | (899)
Excess tax benefits from share based compensation |  | (5,377) |  |
Revaluation of net deferred tax liabilities for the Tax Act |  | (246,845) |  |
Other, net |  | (879) | 1,323 | 334
Provision (benefit) for income taxes |  | (140,724) | (87,226) | $ 76,505
Deferred tax assets: |  |  |  |
Intangible Asset |  | (206) | 4,983 |
Accrued benefits |  | 31,651 | 48,482 |
Net operating loss carryforward |  | 122,648 | 286,389 |
AMT credit carryforward |  | 23,443 | 17,589 |
Deferred aircraft credits |  | 53,870 | 60,415 |
Accrued reserves and other |  | 26,853 | 47,906 |
Total deferred tax assets |  | 258,259 | 465,764 |
Valuation allowance |  | (10,642) | (8,877) |
Deferred tax liabilities: |  |  |  |
Accelerated depreciation |  | (666,637) | (1,022,291) |
Total deferred tax liabilities |  | (666,637) | (1,022,291) |
Net deferred tax liability |  | $ (419,020) | $ (565,404) |
Forecast |  |  |  |
Statutory Federal income tax rate (as a percent) | 21.00% |  |  |

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