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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Aug. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Incurred losses and loss adjustment expenses, current accident years $ 1,434,871 $ 1,266,996 $ 3,934,969 $ 3,420,906  
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)     25,000    
Favorable (adverse) development on prior years' loss reserves     169,754 204,411  
Reinsurance recoverable for retroactive reinsurance transaction (125,067) 0 (125,067) 0  
Vesttoo LOC 1          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Letters of Credit, Collateral for Reinsurance Recoverable         $ 50,000
Vesttoo LOC 2          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Letters of Credit, Collateral for Reinsurance Recoverable         $ 77,800
Hawaiian wildfires and Hurricane Idalia          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Incurred losses and loss adjustment expenses, current accident years     46,200    
Hurricane Ian (2022)          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Incurred losses and loss adjustment expenses, current accident years       70,000  
Russian-Ukraine Conflict          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Incurred losses and loss adjustment expenses, current accident years       35,000  
Insurance [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Incurred losses and loss adjustment expenses, current accident years 1,258,864 1,100,511 3,415,860 2,906,031  
Insurance [Member] | Professional Liability, Property, Marine and Energy, Workers Comp and Personal lines [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Favorable (adverse) development on prior years' loss reserves     239,800    
Insurance [Member] | General Liability [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Favorable (adverse) development on prior years' loss reserves     70,500    
Insurance [Member] | Workers' Compensation, Property, Marine and Energy and Programs [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Favorable (adverse) development on prior years' loss reserves       155,000  
Reinsurance [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Incurred losses and loss adjustment expenses, current accident years 176,007 $ 166,485 519,109 514,875  
Reinsurance recoverable for retroactive reinsurance transaction $ (125,100)   (125,100)    
Reinsurance [Member] | Professional liability and Property [Member]          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Favorable (adverse) development on prior years' loss reserves     34,100    
Reinsurance [Member] | Public Entity and General Liability          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Favorable (adverse) development on prior years' loss reserves     $ (60,900)    
Reinsurance [Member] | Property and Credit and Surety          
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]          
Favorable (adverse) development on prior years' loss reserves       $ 41,700