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RESERVE FOR LOSSES AND LOSS EXPENSES - Incurred Losses Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Additional Information Related to Net Incurred Losses [Line Items]      
Net losses and loss expenses, net of reinstatement premiums $ 2,981,220 $ 3,267,943 $ 3,041,193
Reinsurance recoverable on unpaid losses 53,746 (685,132) (39,174)
Third Party - Loss Portfolio Transfer      
Additional Information Related to Net Incurred Losses [Line Items]      
Reinsurance recoverable on unpaid losses 74,000 422,000  
Syndicate 2007      
Additional Information Related to Net Incurred Losses [Line Items]      
Reinsurance recoverable on unpaid losses     49,000
Catastrophe and Weather-related Events      
Additional Information Related to Net Incurred Losses [Line Items]      
Net losses and loss expenses, net of reinstatement premiums $ 138,000 $ 403,000 $ 443,000