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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net deferred tax assets and liabilities [Abstract] |  |  |
Total deferred tax assets | $ 144,819 | $ 32,331 |
Total deferred tax liabilities | (20,050) | (71,743) |
Net deferred tax asset | 124,769 |  |
Net deferred tax liability |  | (39,412) |
Components of net deferred tax asset [Abstract] |  |  |
Unearned premium reserves | 16,209 | 19,116 |
Benefit plans | (9,444) | (21,360) |
Loss reserves | 1,785 | 4,034 |
Unrealized depreciation in investments | 108,588 |  |
Unrealized appreciation in investments |  | (39,883) |
Deferred policy acquisition cost | (4,003) | (4,551) |
Deferred compensation | 6,806 | 6,118 |
Research and experimental costs | 9,719 | 0 |
Other, net | (4,891) | (2,886) |
Components of provisions for (benefit from) income taxes [Abstract] |  |  |
Current federal | 228,259 | 161,055 | $ 85,574
Deferred federal | (5,235) | 4,392 | 28,244
Other | 1,661 | 1,347 | (648)
Provision for income taxes | $ 224,685 | $ 166,794 | $ 113,170
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%) | (0.60%) | (0.90%)
Other, net (in hundredths) | 0.10% | 0.40% | 0.10%
Effective income tax provision rate (in hundredths) | 20.60% | 20.80% | 20.20%
Income taxes paid | $ 236,500 | $ 155,300 | $ 79,600
Amount of tax and loss bonds held | 661,700 |  |
Unrecognized tax benefits | $ 0 | $ 0 |

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