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Investments - Summarized Fair Value and Gross Unrealized Losses on Securities Available for Sale (Details) $ in Thousands | Mar. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 321 | 404
Less than 12 months, Fair value | $ 432,602 | $ 682,402
Less than 12 months, Unrealized losses | $ (25,591) | $ (13,818)
12 months or longer, Number of issues | security | 171 | 33
12 months or longer, Fair value | $ 271,247 | $ 45,645
12 months or longer, Unrealized losses | $ (27,720) | $ (1,853)
Fixed Maturities | U.S. government obligations and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 2 | 4
Less than 12 months, Fair value | $ 11,549 | $ 18,913
Less than 12 months, Unrealized losses | $ (63) | $ (111)
12 months or longer, Number of issues | security | 5 | 4
12 months or longer, Fair value | $ 10,112 | $ 5,016
12 months or longer, Unrealized losses | $ (656) | $ (223)
Fixed Maturities | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 188 | 249
Less than 12 months, Fair value | $ 253,022 | $ 378,595
Less than 12 months, Unrealized losses | $ (16,821) | $ (7,468)
12 months or longer, Number of issues | security | 95 | 18
12 months or longer, Fair value | $ 118,710 | $ 17,356
12 months or longer, Unrealized losses | $ (12,044) | $ (679)
Fixed Maturities | Mortgage-backed and asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 118 | 145
Less than 12 months, Fair value | $ 156,773 | $ 274,883
Less than 12 months, Unrealized losses | $ (7,653) | $ (5,969)
12 months or longer, Number of issues | security | 70 | 11
12 months or longer, Fair value | $ 138,894 | $ 23,273
12 months or longer, Unrealized losses | $ (14,547) | $ (951)
Fixed Maturities | Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 9 | 5
Less than 12 months, Fair value | $ 9,988 | $ 9,811
Less than 12 months, Unrealized losses | $ (932) | $ (269)
12 months or longer, Number of issues | security | 1 | 0
12 months or longer, Fair value | $ 3,531 | $ 0
12 months or longer, Unrealized losses | $ (473) | $ 0
Fixed Maturities | Redeemable preferred stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, Number of issues | security | 4 | 1
Less than 12 months, Fair value | $ 1,270 | $ 200
Less than 12 months, Unrealized losses | $ (122) | $ (1)
12 months or longer, Number of issues | security | 0 | 0
12 months or longer, Fair value | $ 0 | $ 0
12 months or longer, Unrealized losses | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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