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Allowance for Credit Losses on Premiums Receivable (Tables)
9 Months Ended
Sep. 30, 2023
Premiums Receivable Disclosure [Abstract]  
Allowance for Credit Losses on Premiums Receivable [Table Text Block]
Quarter ended September 30,Nine Months ended September 30,
($ in thousands)2023202220232022
Balance at beginning of period$17,900 $14,900 $16,100 $13,600 
Current period change for expected credit losses1,973 2,250 5,398 4,335 
Write-offs charged against the allowance for credit losses(1,257)(2,349)(3,468)(3,787)
Recoveries284 399 870 1,052 
Allowance for credit losses, end of period$18,900 $15,200 $18,900 $15,200