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Losses And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves at January 1 $ 1,146,688 $ 1,091,797 $ 1,038,984  
Reissuance recoverable 13,161 14,253 14,192 $ 13,635
Net reserves at January 1 1,132,435 1,077,605 1,025,349  
Acquisition of WAIC reserves 0 18,677 0  
Incurred losses and loss adjustment expense related to:        
Current year 2,269,769 2,132,837 1,989,315  
Prior year claims and claim adjustment expense 85,369 12,658 (3,193)  
Total incurred losses and loss adjustment expenses 2,355,138 2,145,495 1,986,122  
Loss and loss adjustment expense payments related to:        
Current year 1,508,362 1,455,245 1,347,967  
Prior years 702,124 654,097 585,899  
Total payments 2,210,486 2,109,342 1,933,866  
Net reserves at year-end 1,277,087 1,132,435 1,077,605  
Gross reserves at year-end $ 1,290,248 $ 1,146,688 $ 1,091,797