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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Development (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 6,319 | $ 3,940 | $ 10,357 | $ 12,897
Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,784 | 2,773 | 3,825 | 9,838
Reinsurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 3,535 | $ 1,167 | $ 6,532 | $ 3,059

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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