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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserve for losses and loss expenses, beginning of period     $ 14,653,094 $ 13,926,766
Less reinsurance recoverable on unpaid losses and loss expenses, beginning of period     (5,017,611) (4,496,641)
Net reserve for unpaid losses and loss expenses, beginning of period     9,635,483 9,430,125
Net incurred losses and loss expenses related to:        
Current year     2,461,828 2,315,697
Prior years $ (4,735) $ (11,012) (17,632) (23,138)
Net incurred losses and loss expenses 941,911 911,369 2,444,196 2,292,559
Net paid losses and loss expenses related to:        
Current year     (269,466) (263,969)
Prior years     (1,900,366) (1,778,479)
Net paid losses and loss expenses     (2,169,832) (2,042,448)
Foreign exchange and other     (501,914) (10,885)
Net reserve for unpaid losses and loss expenses, end of period 9,407,933 9,669,351 9,407,933 9,669,351
Reinsurance recoverable on unpaid losses and loss expenses, end of period 5,244,263 4,989,645 5,244,263 4,989,645
Gross reserve for losses and loss expenses, end of period $ 14,652,196 $ 14,658,996 $ 14,652,196 $ 14,658,996