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Premiums and Reinsurance Related Information - Premiums and Reinsurance, Allowance For Credit Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Premium Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period $ 35,039 $ 32,353 $ 35,110 $ 30,660
Cumulative effect adjustment resulting from changes in accounting principles 37,279 32,770 37,279 32,770
Change in expected credit losses 2,240 417 2,169 2,110
Allowance for expected credit losses, end of period 37,279 32,770 37,279 32,770
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period 9,185 8,703 8,404 8,064
Cumulative effect adjustment resulting from changes in accounting principles 10,255 9,365 10,255 9,365
Reinsurance Recoverable, Credit Loss Expense (Reversal) 1,070 662 1,851 1,301
Allowance for expected credit losses, end of period $ 10,255 $ 9,365 $ 10,255 $ 9,365