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10-Q Investments - Schedule of Restricted Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Marketable Securities [Line Items]        
Restricted fixed maturity securities $ 434,650 $ 279,958   $ 91,309
Restricted short-term investments 12,712 4,864   24,699
Restricted cash and cash equivalents 18,494 1,698 $ 10,396 15,992
Restricted assets 465,856 286,520   132,000
U.S. government and government agency        
Marketable Securities [Line Items]        
Restricted fixed maturity securities 224,415 142,297   13,932
State and municipal        
Marketable Securities [Line Items]        
Restricted fixed maturity securities 19,428 19,585   18,972
Commercial mortgage-backed securities        
Marketable Securities [Line Items]        
Restricted fixed maturity securities 20,781 9,333   6,715
Residential mortgage-backed securities        
Marketable Securities [Line Items]        
Restricted fixed maturity securities 77,507 35,313   19,570
Asset-backed securities        
Marketable Securities [Line Items]        
Restricted fixed maturity securities 33,330 23,798   7,343
Corporate        
Marketable Securities [Line Items]        
Restricted fixed maturity securities $ 59,189 $ 49,632   $ 24,777