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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
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     $ 9,025,961 $ 7,455,128  
Net incurred related to:          
Current year $ 1,999,837 $ 1,945,695 3,608,599 3,393,828  
Prior years (31,906) (147,650) (92,696) (208,711)  
Total net incurred 1,967,931 1,798,045 3,515,903 3,185,117  
Net paid related to:          
Current year     101,258 250,395  
Prior years     1,454,977 1,282,895  
Total net paid     1,556,235 1,533,290  
Foreign exchange     (291,918) (66,469)  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 10,693,711 9,040,486 10,693,711 9,040,486  
Reinsurance recoverable 4,969,244 4,192,758 4,969,244 4,192,758 $ 4,268,669
Reserve for claims and claim expenses as of end of period $ 15,662,955 $ 13,233,244 $ 15,662,955 $ 13,233,244