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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 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 $ 1,417,773 $ 963,309 2,680,977 1,869,261  
Prior years (108,271) (32,098) (205,352) (136,850)  
Total net incurred 1,309,502 931,211 2,475,625 1,732,411  
Net paid related to:          
Current year     100,022 92,909  
Prior years     1,614,571 1,406,684  
Total net paid     1,714,593 1,499,593  
Foreign exchange and other     (17,422) 34,311  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 15,886,193 11,448,777 15,886,193 11,448,777  
Reinsurance recoverable as of end of period 4,854,735 4,689,351 4,854,735 4,689,351 $ 5,344,286
Reserve for claims and claim expenses as of end of period $ 20,740,928 $ 16,138,128 $ 20,740,928 $ 16,138,128