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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net deferred tax assets and liabilities [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total deferred tax assets | $ 63,533 |  |  |  | $ 83,082 |  |  |  | $ 63,533 | $ 83,082 |
Total deferred tax liabilities | (57,791) |  |  |  | (13,898) |  |  |  | (57,791) | (13,898) |
Net deferred tax asset | 5,742 |  |  |  | 69,184 |  |  |  | 5,742 | 69,184 |
Components of net deferred tax asset [Abstract] |  |  |  |  |  |  |  |  |  |  |
Unearned premium reserves | 30,487 |  |  |  | 31,808 |  |  |  | 30,487 | 31,808 |
Benefit plans | (10,790) |  |  |  | (5,047) |  |  |  | (10,790) | (5,047) |
Loss reserves | 2,175 |  |  |  | 3,113 |  |  |  | 2,175 | 3,113 |
Unrealized (appreciation) depreciation in investments | (36,822) |  |  |  | 9,407 |  |  |  | (36,822) | 9,407 |
Mortgage investments | 8,359 |  |  |  | 8,307 |  |  |  | 8,359 | 8,307 |
Deferred compensation | 9,270 |  |  |  | 8,662 |  |  |  | 9,270 | 8,662 |
AMT credit carryforward | 8,303 |  |  |  | 17,521 |  |  |  | 8,303 | 17,521 |
Other, net | (5,240) |  |  |  | (4,587) |  |  |  | (5,240) | (4,587) |
Components of provisions for (benefit from) income taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Current Federal |  |  |  |  |  |  |  |  | 162,911 | (16,272) | $ 73,348
Deferred Federal |  |  |  |  |  |  |  |  | 11,860 | 185,598 | 351,677
Other |  |  |  |  |  |  |  |  | (557) | 4,727 | 3,710
Provision for income taxes | 45,599 | $ 46,186 | $ 43,433 | $ 38,996 | 36,963 | $ 49,994 | $ 50,708 | $ 36,388 | 174,214 | 174,053 | 428,735
Income tax expense due to remeasurement of net deferred tax assets |  |  |  |  |  |  |  |  |  |  | 133,000
Income taxes paid |  |  |  |  |  |  |  |  | 158,300 | $ 12,200 | $ 22,000
Amount of tax and loss bonds held | 176,000 |  |  |  |  |  |  |  | $ 176,000 |  |
Reconciliation of effective income tax rate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Federal statutory income tax rate (in hundredths) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Additional income tax provision (benefit) related to the rate decrease included in the Tax Act (in hundredths) |  |  |  |  |  |  |  |  | 0 | 0 | 0.170
Additional income tax provision related to IRS litigation (in hundredths) |  |  |  |  |  |  |  |  | 0.00% | (0.30%) | 3.70%
Tax exempt municipal bond interest (in hundredths) |  |  |  |  |  |  |  |  | (0.60%) | (0.70%) | (1.40%)
Other, net (in hundredths) |  |  |  |  |  |  |  |  | 0.10% | 0.60% | 0.40%
Effective income tax provision rate (in hundredths) |  |  |  |  |  |  |  |  | 20.50% | 20.60% | 54.70%
Unrecognized tax benefits [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 0 |  |  |  | $ 142,821 | $ 0 | $ 142,821 | $ 108,245
Additions for tax positions of prior years |  |  |  |  |  |  |  |  |  | 0 | 35,003
Reductions for tax positions of prior years |  |  |  |  |  |  |  |  |  | (3,070) | (427)
Settlements |  |  |  |  |  |  |  |  |  | (139,751) | 0
Balance at end of year | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | 0 | $ 142,821
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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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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- Definition Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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