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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