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Reserves For Losses And Loss Expenses (Reconciliation of Net Incurred and Paid Claims Development to Reserves for Loss and Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance $ 13,300,678    
Total due from reinsurers on unpaid claims 2,542,526    
Total loss reserve discount (452,316)    
Gross reserves at end of year 15,390,888 $ 13,784,430 $ 12,583,249
Other liability      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 4,949,705    
Workers' compensation      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,936,327    
Professional liability      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,504,866    
Commercial automobile      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 923,513    
Short-tail lines      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 653,088    
Casualty      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,774,453    
Monoline excess      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,225,747    
Property      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 227,720    
Insurance      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 10,072,758    
Total due from reinsurers on unpaid claims 2,318,301    
Total loss reserve discount (12,338)    
Insurance | Other liability      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 4,949,705    
Total due from reinsurers on unpaid claims 693,801    
Total loss reserve discount 0    
Insurance | Workers' compensation      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,936,327    
Total due from reinsurers on unpaid claims 247,361    
Total loss reserve discount (12,338)    
Insurance | Professional liability      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,504,866    
Total due from reinsurers on unpaid claims 851,485    
Total loss reserve discount 0    
Insurance | Commercial automobile      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 923,513    
Total due from reinsurers on unpaid claims 42,991    
Total loss reserve discount 0    
Insurance | Short-tail lines      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 653,088    
Total due from reinsurers on unpaid claims 426,003    
Total loss reserve discount 0    
Insurance | Other      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 105,259    
Total due from reinsurers on unpaid claims 56,660    
Total loss reserve discount 0    
Reinsurance & Monoline Excess      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 3,227,920    
Total due from reinsurers on unpaid claims 224,225    
Total loss reserve discount (439,978)    
Reinsurance & Monoline Excess | Casualty      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,774,453    
Total due from reinsurers on unpaid claims 107,593    
Total loss reserve discount (97,202)    
Reinsurance & Monoline Excess | Monoline excess      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 1,225,747    
Total due from reinsurers on unpaid claims 40,313    
Total loss reserve discount 342,776    
Reinsurance & Monoline Excess | Property      
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]      
Total undiscounted reserves for loss and loss expenses, net of reinsurance 227,720    
Total due from reinsurers on unpaid claims 76,319    
Total loss reserve discount $ 0