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Allowance for Credit Losses on Premiums Receivable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Premiums Receivable, Allowance for Credit Loss [Line Items]      
Premium Receivable, Allowance for Credit Loss $ 16,100 $ 13,600  
Change in allowance for credit losses on premiums receivable 7,500 1,900  
Reductions in allowance for credit losses on premiums receivable      
Premiums Receivable, Allowance for Credit Loss [Line Items]      
Change in allowance for credit losses on premiums receivable 1,800 6,400  
Premiums Receivable, Allowance for Credit Losses      
Premiums Receivable, Allowance for Credit Loss [Line Items]      
Change in allowance for credit losses on premiums receivable 9,300 8,300  
Premiums Receivable [Member]      
Premiums Receivable, Allowance for Credit Loss [Line Items]      
Premium Receivable, Allowance for Credit Loss   13,600 $ 21,000
Current period provision for expected credit losses 6,065 1,291  
Write-offs charged against the allowance for credit losses (4,978) (9,343)  
Recoveries $ 1,413 $ 652