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Related Party Transactions - RISCOM Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2016
Related Party Transaction [Line Items]      
Net earned premium $ 615,994 $ 499,823  
Premiums receivable 139,215 112,158  
Affiliated entity | Agency agreement | RISCOM      
Related Party Transaction [Line Items]      
Agreement, ownership interest     20.00%
Net earned premium 91,051 76,701  
Gross written commissions 23,472 21,256  
Premiums receivable $ 9,940 $ 11,334