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RESERVE FOR LOSSES AND LOSS EXPENSES - Reserve Roll-Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserve for losses and loss expenses, beginning of period     $ 16,434,018 $ 15,168,863
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period     (6,323,083) (5,831,172)
Net reserve for unpaid losses and loss expenses, beginning of period     10,110,935 9,337,691
Net incurred losses and loss expenses related to:        
Current year     2,334,543 2,253,958
Prior years $ (8,012) $ (2,762) (8,011) (13,118)
Net incurred losses and loss expenses 831,872 783,940 2,326,532 2,240,840
Net paid losses and loss expenses related to:        
Current year     (308,581) (272,260)
Prior years     (1,769,278) (1,730,640)
Net paid losses and loss expenses     (2,077,859) (2,002,900)
Foreign exchange and other     124,792 (51,902)
Net reserve for unpaid losses and loss expenses, end of period 10,484,400 9,523,729 10,484,400 9,523,729
Reinsurance recoverable on unpaid losses and loss expenses, end of period 6,810,929 6,031,527 6,810,929 6,031,527
Gross reserve for losses and loss expenses, end of period $ 17,295,329 $ 15,555,256 $ 17,295,329 $ 15,555,256