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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes |  |  |
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 | $ (87,084) | $ 68,013 | $ (5,720)
State income tax provision (benefit), net of federal income tax benefit | (5,768) | 5,416 | (107)
Non-deductible expenses | 3,552 | 3,641 | 3,865
Valuation allowance changes affecting the provision for income taxes | 751 | (899) | 5,981
Foreign income taxes, net of federal & state benefit |  |  | 1,973
Other, net | 1,323 | 334 | 1,819
Provision for income taxes | (87,226) | 76,505 | $ 7,811
Deferred tax assets: |  |  |
Intangible Asset | 4,983 | 30,369 |
Accrued benefits | 48,482 | 47,514 |
Net operating loss carryforward | 286,389 | 82,211 |
AMT credit carryforward | 17,589 | 21,391 |
Deferred aircraft credits | 60,415 | 55,544 |
Accrued reserves and other | 47,906 | 24,575 |
Total deferred tax assets | 465,764 | 261,604 |
Valuation allowance | (8,877) | (8,126) |
Deferred tax liabilities: |  |  |
Accelerated depreciation | (1,022,291) | (902,322) |
Total deferred tax liabilities | (1,022,291) | (902,322) |
Net deferred tax liability | $ 565,404 | $ 648,844 |

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