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RESERVE FOR LOSSES AND LOSS EXPENSES - Incurred Losses Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Additional Information Related to Net Incurred Losses [Line Items]      
Net losses and loss expenses, net of reinstatement premiums $ 3,182,810 $ 2,981,220 $ 3,267,943
Reinsurance recoverable on unpaid losses 7,419 53,746 (685,132)
Third Party - Loss Portfolio Transfer      
Additional Information Related to Net Incurred Losses [Line Items]      
Reinsurance recoverable on unpaid losses   74,000 422,000
Catastrophe and Weather-related Events      
Additional Information Related to Net Incurred Losses [Line Items]      
Net losses and loss expenses, net of reinstatement premiums $ 226,000 $ 138,000 $ 403,000