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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Development (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 4,735 | $ 11,012 | $ 17,632 | $ 23,138
Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | 2,558 | 5,418 | 12,396 | 13,351
Reinsurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Prior years - net favorable (adverse) effect | $ 2,177 | $ 5,594 | $ 5,236 | $ 9,787

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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