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Allowance for Credit Losses on Premiums Receivable (Tables)
6 Months Ended
Jun. 30, 2023
Premiums Receivable Disclosure [Abstract]  
Allowance for Credit Losses on Premiums Receivable [Table Text Block]
Quarter ended June 30,Six Months ended June 30,
($ in thousands)2023202220232022
Balance at beginning of period$17,100 $14,300 $16,100 $13,600 
Current period change for expected credit losses1,515 1,169 3,425 2,085 
Write-offs charged against the allowance for credit losses(1,047)(918)(2,211)(1,438)
Recoveries332 349 586 653 
Allowance for credit losses, end of period$17,900 $14,900 $17,900 $14,900