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RESERVE FOR CLAIMS AND CLAIM EXPENSES - Reconciliation of the Disclosure of Incurred and Paid Claims Development to the Reserve for Claims and Claim Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses $ 16,822,101 $ 15,142,583 $ 11,181,648 $ 9,025,961
Reinsurance Recoverable 4,481,390 5,344,286 4,710,925  
Total reserve for claims and claim expenses 21,303,491 $ 20,486,869 $ 15,892,573  
Property        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 4,906,841      
Reinsurance Recoverable 1,665,898      
Casualty and Specialty        
Liability for Claims and Claims Adjustment Expense [Line Items]        
Net Reserve for Claims and Claim Expenses 11,915,260      
Reinsurance Recoverable $ 2,815,492