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Allowance for Credit Losses on Premiums Receivable (Tables) | 6 Months Ended
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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) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Balance at beginning of period |  | $ | 17,100 |  |  | $ | 14,300 |  |  | $ | 16,100 |  |  | $ | 13,600 |
Current period change for expected credit losses |  | 1,515 |  |  | 1,169 |  |  | 3,425 |  |  | 2,085 |
Write-offs charged against the allowance for credit losses |  | (1,047) |  |  | (918) |  |  | (2,211) |  |  | (1,438) |
Recoveries |  | 332 |  |  | 349 |  |  | 586 |  |  | 653 |
Allowance for credit losses, end of period |  | $ | 17,900 |  |  | $ | 14,900 |  |  | $ | 17,900 |  |  | $ | 14,900 |

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- Definition Tabular disclosure of allowance for credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
Name: | us-gaap_PremiumReceivableAllowanceForCreditLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PremiumsReceivableDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration