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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Insurance Loss Reserves [Abstract]        
Total net (favorable) adverse development of prior accident years net claims and claim expenses $ (380,051) $ (292,506) $ (845,635) $ (497,858)