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RESERVE FOR LOSSES AND LOSS EXPENSES (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Net loss and loss expenses | $ 720,035 | $ 914,186 |
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 | $ 110,000 | $ 300,000 |

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