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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Net loss and loss expenses $ 728,671 $ 724,680
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 $ 20,000 $ 38,000