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RESERVE FOR LOSSES AND LOSS EXPENSES - Incurred Losses Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net losses and loss expenses, net of reinstatement premiums | $ 3,182,810 | $ 2,981,220 | $ 3,267,943
Reinsurance recoverable on unpaid losses | 7,419 | 53,746 | (685,132)
Third Party - Loss Portfolio Transfer |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Reinsurance recoverable on unpaid losses |  | 74,000 | 422,000
Catastrophe and Weather-related Events |  |  |
Additional Information Related to Net Incurred Losses [Line Items] |  |  |
Net losses and loss expenses, net of reinstatement premiums | $ 226,000 | $ 138,000 | $ 403,000

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