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RESERVE FOR LOSSES AND LOSS EXPENSES - Reserve Roll-Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Gross reserve for losses and loss expenses, beginning of period $ 15,168,863 $ 14,653,094
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period (5,831,172) (5,017,611)
Net reserve for unpaid losses and loss expenses, beginning of period 9,337,691 9,635,483
Net incurred losses and loss expenses related to:    
Current year 724,680 741,655
Prior years (4,038) (8,956)
Net incurred losses and loss expenses 720,642 732,699
Net paid losses and loss expenses related to:    
Current year (38,662) (32,477)
Prior years (574,538) (750,969)
Net paid losses and loss expenses (613,200) (783,446)
Foreign exchange and other 46,094 (71,661)
Net reserve for unpaid losses and loss expenses, end of period 9,491,227 9,513,075
Reinsurance recoverable on unpaid losses and loss expenses, end of period 5,823,417 4,957,080
Gross reserve for losses and loss expenses, end of period $ 15,314,644 $ 14,470,155