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RESERVE FOR LOSSES AND LOSS EXPENSES - Reserve Roll-Forward (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 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     1,494,659 1,467,256
Prior years $ 0 $ (6,319) 0 (10,357)
Net incurred losses and loss expenses 765,988 736,257 1,494,659 1,456,899
Net paid losses and loss expenses related to:        
Current year     (159,455) (129,414)
Prior years     (1,251,637) (1,210,101)
Net paid losses and loss expenses     (1,411,092) (1,339,515)
Foreign exchange and other     (47,452) 98,814
Net reserve for unpaid losses and loss expenses, end of period 10,147,050 9,553,889 10,147,050 9,553,889
Reinsurance recoverable on unpaid losses and loss expenses, end of period 6,591,821 5,865,609 6,591,821 5,865,609
Gross reserve for losses and loss expenses, end of period $ 16,738,871 $ 15,419,498 $ 16,738,871 $ 15,419,498