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Unpaid Losses And Loss Adjustment Expenses (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves $ 221,298 $ 139,208
Reinsurance recoverable for retroactive reinsurance transaction 0 (125,067)
Insurance [Member] | International professional liability, marine and energy, credit and surety and general liability product lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves $ 190,700  
Insurance [Member] | Professional liability, property, marine and energy and workers' compensation product lines [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves   169,600
Insurance [Member] | General liability product lines    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves   (53,000)
Reinsurance [Member]    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Reinsurance recoverable for retroactive reinsurance transaction   (125,100)
Reinsurance [Member] | Professional liability and property product lines    
Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Favorable (adverse) development on prior years' loss reserves   $ 20,900