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Investments - Schedule of Restricted Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | $ 516,491 | $ 279,958 |
Restricted short-term investments | 10,002 | 4,864 |
Restricted cash and cash equivalents | 28,822 | 1,698 | $ 7,890
Restricted assets | 555,315 | 286,520 |
U.S. government and government agency |  |  |
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | 211,665 | 142,297 |
State and municipal |  |  |
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | 30,928 | 19,585 |
Commercial mortgage-backed securities |  |  |
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | 33,354 | 9,333 |
Residential mortgage-backed securities |  |  |
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | 96,991 | 35,313 |
Asset-backed securities |  |  |
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | 39,714 | 23,798 |
Corporate |  |  |
Marketable Securities [Line Items] |  |  |
Restricted fixed maturity securities | $ 103,839 | $ 49,632 |

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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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