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RESERVE FOR LOSSES AND LOSS EXPENSES - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Net loss and loss expenses $ 1,494,659 $ 1,467,256
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 $ 67,000 $ 70,000