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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes |  |  |
Statutory Federal income tax rate (as a percent) | 21.00% | 21.00% | 21.00%
Reconciliation |  |  |
Computed provision (benefit) for income taxes at the statutory rate | $ 8,465 | $ 19,442 | $ 31,628
State income tax provision, net of federal income tax benefit | 2,056 | 4,295 | 6,247
Non-deductible expenses | 3,578 | 546 | 1,007
Valuation allowance changes affecting the provision for income taxes | (1,085) | 1,716 |
Excess tax benefits from share based compensation | 939 | 534 | (92)
Change in unrecognized tax benefit | (7,556) | (7,319) |
Other, net | (430) | 416 | (90)
Provision for income taxes | 5,967 | 19,630 | 38,700
Valuation allowance | 1,100 | 1,700 |
Benefit (expense) from share-based compensation | (900) | (500) | $ 100
Deferred tax assets: |  |  |
Accrued benefits | 28,889 | 29,154 |
Net operating loss carryforward | 130,478 | 186,517 |
Aircraft credits | 93,189 | 77,962 |
Deferred revenue | 91,809 | 35,385 |
Operating lease liabilities | 21,207 | 39,209 |
Interest deduction limitation | 11,563 | 26,469 |
Accrued reserves and other | 64,971 | 49,972 |
Total deferred tax assets | 442,106 | 444,668 |
Valuation allowance | (630) | (1,716) |
Deferred tax liabilities: |  |  |
Accelerated depreciation | (1,108,042) | (1,094,538) |
Operating lease right-of-use assets | (21,034) | (35,474) |
Total deferred tax liabilities | (1,129,076) | (1,130,012) |
Net deferred tax liability | $ (687,600) | $ (687,060) |

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