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Segment Reporting Disclosures (Summary Of Deferred Policy Acquisition Costs, Unearned Premiums And Unpaid Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs $ 875,710 $ 931,344    
Unearned premiums 7,063,956 6,642,426    
Unpaid losses and loss adjustment expenses 26,633,094 23,483,321 $ 20,947,898 $ 18,178,894
Underwriting Operations [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 875,710 931,344    
Unearned premiums 5,218,766 5,216,330    
Unpaid losses and loss adjustment expenses 20,092,936 18,112,801    
Market CATCo Re        
Segment Reporting Information [Line Items]        
Unpaid losses and loss adjustment expenses 25,005 184,967    
Insurance [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 648,969 708,128    
Unearned premiums 4,283,879 4,307,704    
Unpaid losses and loss adjustment expenses 16,073,355 14,221,258    
Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 226,741 223,216    
Unearned premiums 933,329 901,138    
Unpaid losses and loss adjustment expenses 3,870,059 3,726,472    
Other underwriting [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 0 0    
Unearned premiums 1,558 7,488    
Unpaid losses and loss adjustment expenses 149,522 165,071    
Fronting [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 0 0    
Unearned premiums 1,845,190 1,426,096    
Unpaid losses and loss adjustment expenses 6,515,153 5,185,553    
Market CATCo Re        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 0 0    
Unearned premiums 0 0    
Unpaid losses and loss adjustment expenses $ 25,005 $ 184,967