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Premiums and Reinsurance Related Information - Premiums and Reinsurance, Allowance For Credit Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Premium Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period $ 30,557 $ 32,770 $ 30,660 $ 25,218
Cumulative effect adjustment resulting from changes in accounting principles 33,602 30,578 33,602 30,578
Change in expected credit losses 832 21 2,942 5,360
Allowance for expected credit losses, end of period 33,602 30,578 33,602 30,578
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]        
Allowance for expected credit losses, beginning of period 9,365 7,744 8,064 7,713
Cumulative effect adjustment resulting from changes in accounting principles 9,443 7,999 9,443 7,999
Reinsurance Recoverable, Credit Loss Expense (Reversal) 78 255 1,379 286
Allowance for expected credit losses, end of period $ 9,443 $ 7,999 $ 9,443 $ 7,999