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Unpaid Losses And Loss Adjustment Expenses (Reconciliation Of Net Incurred And Paid Loss Development Tables, By Segment, To The Liability For Losses And Loss Adjustment Expenses In The Consolidated Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance $ 15,087,702      
Reinsurance recoverable on unpaid losses 11,120,367      
Unallocated loss adjustment expenses 425,025      
Total gross liability for unpaid losses and loss adjustment expenses 26,633,094 $ 23,483,321 $ 20,947,898 $ 18,178,894
Market CATCo Re        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 25,005      
Insurance [Member]        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 11,550,516      
Reinsurance recoverable on unpaid losses 4,129,856      
Total gross liability for unpaid losses and loss adjustment expenses 16,073,355 14,221,258    
Reinsurance [Member]        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 3,442,663      
Reinsurance recoverable on unpaid losses 397,810      
Total gross liability for unpaid losses and loss adjustment expenses 3,870,059 3,726,472    
Other underwriting [Member]        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 62,903      
Reinsurance recoverable on unpaid losses 84,079      
Total gross liability for unpaid losses and loss adjustment expenses 149,522 165,071    
Fronting [Member]        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Liabilities for unpaid losses and loss adjustment expenses, net of reinsurance 6,615      
Reinsurance recoverable on unpaid losses 6,508,622      
Total gross liability for unpaid losses and loss adjustment expenses $ 6,515,153 $ 5,185,553