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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 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 $ 1,666,120 $ 1,019,523 4,347,097 2,888,784  
Prior years (292,506) (157,947) (497,858) (294,797)  
Total net incurred 1,373,614 861,576 3,849,239 2,593,987  
Net paid related to:          
Current year     252,103 181,155  
Prior years     2,336,002 1,880,700  
Total net paid     2,588,105 2,061,855  
Foreign exchange and other     78,840 (11,874)  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 16,482,557 11,701,906 16,482,557 11,701,906  
Reinsurance recoverable as of end of period 4,738,637 4,253,259 4,738,637 4,253,259 $ 5,344,286
Reserve for claims and claim expenses as of end of period $ 21,221,194 $ 15,955,165 $ 21,221,194 $ 15,955,165