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Reserve For Losses, LAE And Future Policy Benefit Reserve (Reconciliation of the Net Incurred and Paid Claims Development) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 14,322,754      
Total reinsurance recoverable on unpaid claims 1,843,691      
Unallocated claims adjustment expenses 194,111      
Other 38,441      
Total expenses 232,552      
Total gross liability for unpaid claims and claim adjustment expense 16,398,997 $ 13,611,313 $ 13,119,090 $ 11,884,321
Reinsurance [Member] | Casualty Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 6,714,191      
Total reinsurance recoverable on unpaid claims 399,865      
Reinsurance [Member] | Property Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 4,339,172      
Total reinsurance recoverable on unpaid claims 456,062      
Insurance [Member] | Casualty Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 2,868,104      
Total reinsurance recoverable on unpaid claims 818,701      
Insurance [Member] | Property Business [Member]        
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]        
Liabilities for claims and claim adjustment expenses, net of reinsurance 401,287      
Total reinsurance recoverable on unpaid claims $ 169,062