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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net deferred tax assets and liabilities [Abstract] |  |  |
Total deferred tax assets | $ 105,437 | $ 109,391 |
Total deferred tax liabilities | (35,562) | (29,609) |
Net deferred tax asset (liability) | 69,875 | 79,782 |
Components of net deferred tax asset [Abstract] |  |  |
Unearned premium reserves | 11,111 | 13,862 |
Benefit plans | (25,195) | (19,142) |
Loss reserves | 2,291 | 1,921 |
Unrealized losses on investments | 68,550 | 70,961 |
Deferred policy acquisition cost | (2,456) | (3,064) |
Deferred compensation | 7,878 | 7,466 |
Research and experimental costs | 14,143 | 13,351 |
Other, net | (6,447) | (5,573) |
Components of provisions for (benefit from) income taxes [Abstract] |  |  |
Current federal | 199,090 | 187,246 | $ 228,259
Deferred federal | 1,805 | 1,550 | (5,235)
Other | 4,820 | 484 | 1,661
Provision for income taxes | $ 205,715 | $ 189,280 | $ 224,685
Reconciliation of effective income tax rate [Abstract] |  |  |
Federal statutory income tax rate (in hundredths) | 21.00% | 21.00% | 21.00%
Tax exempt municipal bond interest (in hundredths) | (0.30%) | (0.50%) | (0.50%)
Other, net (in hundredths) | 0.50% | 0.50% | 0.10%
Effective income tax provision rate (in hundredths) | 21.20% | 21.00% | 20.60%
Income taxes paid | $ 181,800 | $ 188,200 | $ 236,500
Transferrable federal tax credits purchased | 21,400 |  |
Amount of tax and loss bonds held | 968,200 |  |
Unrecognized tax benefits | $ 0 | $ 0 |

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