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Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves at January 1 $ 1,510,613 $ 1,290,248 $ 1,146,688  
Reinsurance recoverables on unpaid losses 180,859 64,001 13,161 $ 14,253
Net reserves at January 1 1,446,612 1,277,087 1,132,435  
Incurred losses and loss adjustment expense related to:        
Current year 2,483,693 2,390,453 2,269,769  
Prior year claims and claim adjustment expense 93,096 54,431 85,369  
Total incurred losses and loss adjustment expenses 2,576,789 2,444,884 2,355,138  
Loss and loss adjustment expense payments related to:        
Current year 1,543,828 1,550,789 1,508,362  
Prior years 831,020 724,570 702,124  
Total payments 2,374,848 2,275,359 2,210,486  
Net reserves at December 31 1,648,553 1,446,612 1,277,087  
Gross reserves at December 31 $ 1,829,412 $ 1,510,613 $ 1,290,248