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Loss And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Unusual or Infrequent Item, or Both [Line Items]        
Prior year claims and claim adjustment expense   $ 22,979 $ 9,794 $ 93,096
Prior year claims and claim adjustment expense payments   937,142 857,872 831,020
Pre-tax catastrophe losses       289,000
Catastrophe [Member]        
Unusual or Infrequent Item, or Both [Line Items]        
Prior year claims and claim adjustment expense   23,000 9,800 93,100
Pre-tax catastrophe losses, net of reinsurance benefits   64,000 53,000 $ 67,000
Prior year claims and claim adjustment expense payments   5,000 4,000  
Pre-tax catastrophe losses   $ 69,000 $ 57,000  
Fire [Member]        
Unusual or Infrequent Item, or Both [Line Items]        
Loss from catastrophes $ 208,000      
Loss from catastrophes, net of reinsurance benefits 40,000      
Salvage and subrogation recoveries, value $ 10,000