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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Schedule of Reserve for Claims and Claim Expenses by Segment (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves $ 4,926,309 $ 5,262,596  
Additional Case Reserves 2,200,627 2,733,256  
IBNR 14,176,555 12,491,017  
Total 21,303,491 20,486,869 $ 15,892,573
Property | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 1,845,228 2,461,580  
Additional Case Reserves 1,905,553 2,401,911  
IBNR 2,821,958 2,970,129  
Total 6,572,739 7,833,620  
Casualty and Specialty | Operating Segments      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Case Reserves 3,081,081 2,801,016  
Additional Case Reserves 295,074 331,345  
IBNR 11,354,597 9,520,888  
Total $ 14,730,752 $ 12,653,249