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Long-term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Total principal amount $ 104,411 $ 105,515
Less: unamortized debt issuance costs (2,215) (2,746)
Total long-term debt, net 102,196 102,769
Surplus note    
Debt Instrument [Line Items]    
Total principal amount 4,411 5,515
5.625% Senior unsecured notes    
Debt Instrument [Line Items]    
Total principal amount $ 100,000 $ 100,000