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Income Taxes (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 provision for income taxes |  |  |
Computed provision (benefit) for income taxes at the statutory rate | $ 68,013 | $ (5,720) | $ 34,486
State income tax provision (benefit), net of federal income tax benefit | 5,416 | (107) | 2,867
Non-deductible expenses | 3,641 | 3,865 | 3,257
Valuation allowance changes affecting the provision for income taxes | (899) | 5,981 | 1,430
Foreign income taxes, net of federal & state benefit |  | 1,973 |
Other, net | 334 | 1,819 | (2,464)
Provision for income taxes | 76,505 | 7,811 | $ 39,576
Deferred tax assets: |  |  |
Intangible Asset | 30,369 | 34,819 |
Accrued benefits | 47,514 | 43,853 |
Net operating loss carryforward | 82,211 | 152,361 |
AMT credit carryforward | 21,391 | 17,590 |
Deferred aircraft credits | 55,544 | 53,797 |
Accrued reserves and other | 24,575 | 27,008 |
Total deferred tax assets | 261,604 | 329,428 |
Valuation allowance | (8,126) | (9,025) |
Deferred tax liabilities: |  |  |
Accelerated depreciation | (902,322) | (895,405) |
Total deferred tax liabilities | (902,322) | (895,405) |
Net deferred tax liability | $ 648,844 | $ 575,002 |

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