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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Net loss and loss expenses | $ 741,655 | $ 720,035
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 | 60,000 | $ 110,000
Ukraine-Russia War |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Net loss and loss expenses | $ 30,000 |

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