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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net deferred tax assets and liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total deferred tax assets | $ 38,443 |  |  |  | $ 63,533 |  |  |  | $ 38,443 | $ 63,533 |
Total deferred tax liabilities | (98,485) |  |  |  | (57,791) |  |  |  | (98,485) | (57,791) |
Net deferred tax (liability) asset |  |  |  |  | 5,742 |  |  |  |  | 5,742 |
Deferred Tax Liabilities, Net | (60,042) |  |  |  |  |  |  |  | (60,042) |  |
Components of net deferred tax asset [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unearned premium reserves | 23,163 |  |  |  | 30,487 |  |  |  | 23,163 | 30,487 |
Benefit plans | (13,977) |  |  |  | (10,790) |  |  |  | (13,977) | (10,790) |
Loss reserves | 3,542 |  |  |  | 2,175 |  |  |  | 3,542 | 2,175 |
Unrealized appreciation in investments | (72,341) |  |  |  | (36,822) |  |  |  | (72,341) | (36,822) |
Mortgage investments | 0 |  |  |  | 8,359 |  |  |  | 0 | 8,359 |
Deferred compensation | 6,776 |  |  |  | 9,270 |  |  |  | 6,776 | 9,270 |
AMT credit carryforward | 0 |  |  |  | 8,303 |  |  |  | 0 | 8,303 |
Other, net | (7,205) |  |  |  | (5,240) |  |  |  | (7,205) | (5,240) |
Components of provisions for (benefit from) income taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current Federal |  |  |  |  |  |  |  |  | 85,574 | 162,911 | $ (16,272)
Deferred Federal |  |  |  |  |  |  |  |  | 28,244 | 11,860 | 185,598
Other |  |  |  |  |  |  |  |  | (648) | (557) | 4,727
Provision for income taxes | 38,782 | $ 33,518 | $ 2,436 | $ 38,434 | 45,599 | $ 46,186 | $ 43,433 | $ 38,996 | 113,170 | 174,214 | 174,053
Income taxes paid |  |  |  |  |  |  |  |  | 79,600 | $ 158,300 | $ 12,200
Amount of tax and loss bonds held | 271,000 |  |  |  |  |  |  |  | $ 271,000 |  |
Reconciliation of effective income tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal statutory income tax rate (in hundredths) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Additional income tax provision related to IRS litigation (in hundredths) |  |  |  |  |  |  |  |  | 0.00% | 0.00% | (0.30%)
Tax exempt municipal bond interest (in hundredths) |  |  |  |  |  |  |  |  | (0.90%) | (0.60%) | (0.70%)
Other, net (in hundredths) |  |  |  |  |  |  |  |  | 0.10% | 0.10% | 0.60%
Effective income tax provision rate (in hundredths) |  |  |  |  |  |  |  |  | 20.20% | 20.50% | 20.60%
Unrecognized tax benefits | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |
IRS |  |  |  |  |  |  |  |  |  |  |
Reconciliation of effective income tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax and interest payments for IRS settlement |  |  |  |  |  |  |  |  |  |  | $ 14,800
State tax authorities |  |  |  |  |  |  |  |  |  |  |
Reconciliation of effective income tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax and interest payments for IRS settlement |  |  |  |  |  |  |  |  |  |  | $ 36,800

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