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Allowance for Credit Losses on Premiums Receivable (Tables) | 9 Months Ended
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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) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Balance at beginning of period |  | $ | 17,900 |  |  | $ | 14,900 |  |  | $ | 16,100 |  |  | $ | 13,600 |
Current period change for expected credit losses |  | 1,973 |  |  | 2,250 |  |  | 5,398 |  |  | 4,335 |
Write-offs charged against the allowance for credit losses |  | (1,257) |  |  | (2,349) |  |  | (3,468) |  |  | (3,787) |
Recoveries |  | 284 |  |  | 399 |  |  | 870 |  |  | 1,052 |
Allowance for credit losses, end of period |  | $ | 18,900 |  |  | $ | 15,200 |  |  | $ | 18,900 |  |  | $ | 15,200 |

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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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + 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