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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Reinsurance recoverable on unpaid losses and loss expenses (Allowance for expected credit losses 2024: $43,312; 2023: $36,611) | $ 6,810,929 | $ 6,031,527 | $ 6,323,083 | $ 5,831,172
Net loss and loss expenses | 2,334,543 | 2,253,958 |  |
Related Party | Monarch Point Re |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Reinsurance recoverable on unpaid losses and loss expenses (Allowance for expected credit losses 2024: $43,312; 2023: $36,611) |  | 76,000 |  |
Catastrophe and Weather-related Events |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Net loss and loss expenses | $ 145,000 | $ 112,000 |  |

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