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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Reserve Development By Segment and Line of Business (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | $ 17,937 | $ 0
Insurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 13,978 | 0
Insurance | Property |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 9,996 | 8,011
Insurance | Casualty |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 0 | 0
Insurance | Specialty other |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 3,982 | (8,011)
Reinsurance |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 3,959 | 0
Reinsurance | Casualty |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 0 | 0
Reinsurance | Specialty other |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | 3,834 | 0
Reinsurance | Run-off |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net favorable prior year reserve development | $ 125 | $ 0

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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/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: 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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