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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs $ 931,344 $ 925,483    
Unearned premiums 6,642,426 6,220,748    
Unpaid losses and loss adjustment expenses 23,483,321 20,947,898 $ 18,178,894 $ 16,222,376
Underwriting Operations [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 931,344 925,483    
Unearned premiums 5,216,330 4,946,266    
Unpaid losses and loss adjustment expenses 18,112,801 15,395,687    
Market CATCo Re        
Segment Reporting Information [Line Items]        
Unpaid losses and loss adjustment expenses 184,967 347,921    
Insurance [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 708,128 677,921    
Unearned premiums 4,307,704 4,015,252    
Unpaid losses and loss adjustment expenses 14,221,258 11,616,386    
Reinsurance [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 223,216 247,562    
Unearned premiums 901,138 921,541    
Unpaid losses and loss adjustment expenses 3,726,472 3,581,699    
Other underwriting [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 0 0    
Unearned premiums 7,488 9,473    
Unpaid losses and loss adjustment expenses 165,071 197,602    
Program services and other fronting [Member]        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 0 0    
Unearned premiums 1,426,096 1,274,482    
Unpaid losses and loss adjustment expenses 5,185,553 5,204,290    
Market CATCo Re        
Segment Reporting Information [Line Items]        
Deferred policy acquisition costs 0 0    
Unearned premiums 0 0    
Unpaid losses and loss adjustment expenses $ 184,967 $ 347,921