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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves $ 77,023 $ 71,317
Reinsurance recoverable for retroactive reinsurance transaction 0 (125,067)
Insurance [Member] | International professional liability and marine and energy product lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves $ 64,800  
Insurance [Member] | Marine and energy, property, workers' compensation and programs product lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves   63,800
Reinsurance [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Reinsurance recoverable for retroactive reinsurance transaction   $ (125,100)