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Allowance for Uncollectible Premiums Receivable (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Premiums Receiveable, Allowance for Credit Loss [Line Items]        
Premium Receivable, Allowance for Credit Loss $ 14,300   $ 13,600 $ 21,000
Allowance for credit losses, net of write-offs and recoveries 700      
Reduction in allowance for credit losses on older policies        
Premiums Receiveable, Allowance for Credit Loss [Line Items]        
Allowance for credit losses, net of write-offs and recoveries (1,100) $ (1,200)    
Premiums Receivable [Member]        
Premiums Receiveable, Allowance for Credit Loss [Line Items]        
Premium Receivable, Allowance for Credit Loss 14,300 21,000    
Current period provision for expected credit losses 916 808    
Write-offs charged against the allowance for credit losses (520) (874)    
Recoveries 304 66    
Allowance for credit losses, net of write-offs and recoveries $ 2,300 $ 2,100