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RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Reserve Development (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Net favorable prior year reserve development | $ 24,323 | $ (411,882) | $ 25,533
Insurance |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Net favorable prior year reserve development | 16,209 | (176,353) | 16,350
Reinsurance |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |
Net favorable prior year reserve development | $ 8,114 | $ (235,529) | $ 9,183

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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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