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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Net loss and loss expenses | $ 2,461,828 | $ 2,315,697
Novae Syndicate 2007 |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Policyholder benefits and claims incurred, assumed and ceded |  | 49,000
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 | $ 339,000 | $ 389,000

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