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Losses And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves at January 1 $ 1,290,248 $ 1,146,688    
Reissuance recoverable 12,404 14,046 $ 13,161 $ 14,253
Net reserves at January 1 1,277,087 1,132,435    
Incurred losses and loss adjustment expense related to:        
Current year 602,541 554,280    
Prior years claims and claim adjustment expense 4,124 39,802    
Total incurred losses and loss adjustment expenses 606,665 594,082    
Loss and loss adjustment expense payments related to:        
Current year 275,890 261,753    
Prior years 303,333 303,842    
Total payments 579,223 565,595    
Net reserves at year-end 1,304,529 1,160,922    
Gross reserves at year-end $ 1,316,933 $ 1,174,968