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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Reserve for Claims and Claim Expenses by Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 5,127,627 $ 5,262,596  
Additional Case Reserves 1,513,823 1,662,570  
IBNR 13,728,160 13,561,703  
Total 20,369,610 20,486,869 $ 15,996,826
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 2,280,896 2,461,580  
Additional Case Reserves 1,337,581 1,459,010  
IBNR 3,584,236 3,913,030  
Total 7,202,713 7,833,620  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 2,846,731 2,801,016  
Additional Case Reserves 176,242 203,560  
IBNR 10,143,924 9,648,673  
Total $ 13,166,897 $ 12,653,249