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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net deferred tax assets and liabilities [Abstract] |  |  |
Total deferred tax assets | $ 109,391 | $ 144,819 |
Total deferred tax liabilities | (29,609) | (20,050) |
Net deferred tax asset | 79,782 | 124,769 |
Components of net deferred tax asset [Abstract] |  |  |
Unearned premium reserves | 13,862 | 16,209 |
Benefit plans | (19,142) | (9,444) |
Loss reserves | 1,921 | 1,785 |
Unrealized losses on investments | 70,961 | 108,588 |
Deferred policy acquisition cost | (3,064) | (4,003) |
Deferred compensation | 7,466 | 6,806 |
Research and experimental costs | 13,351 | 9,719 |
Other, net | (5,573) | (4,891) |
Components of provisions for (benefit from) income taxes [Abstract] |  |  |
Current federal | 187,246 | 228,259 | $ 161,055
Deferred federal | 1,550 | (5,235) | 4,392
Other | 484 | 1,661 | 1,347
Provision for income taxes | $ 189,280 | $ 224,685 | $ 166,794
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) | (0.50%) | (0.50%) | (0.60%)
Other, net (in hundredths) | 0.50% | 0.10% | 0.40%
Effective income tax provision rate (in hundredths) | 21.00% | 20.60% | 20.80%
Income taxes paid | $ 188,200 | $ 236,500 | $ 155,300
Amount of tax and loss bonds held | 848,600 |  |
Unrecognized tax benefits | $ 0 | $ 0 |

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