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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Liability for Unpaid Claims and Claim Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period $ 15,142,583 $ 11,181,648  
Net incurred related to:      
Current year 1,263,204 905,952  
Prior years (97,081) (104,752)  
Total net incurred 1,166,123 801,200  
Net paid related to:      
Current year 40,657 26,969  
Prior years 872,205 690,868  
Total net paid 912,862 717,837  
Foreign exchange and other (19,914) 25,144  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 15,375,930 11,290,155  
Reinsurance recoverable as of end of period 4,993,680 4,706,671 $ 5,344,286
Reserve for claims and claim expenses as of end of period $ 20,369,610 $ 15,996,826