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Loss And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves at January 1 $ 1,829,412 $ 1,510,613    
Less reinsurance recoverables on unpaid losses (107,117) (46,756) $ (180,859) $ (64,001)
Net reserves at January 1 1,648,553 1,446,612    
Incurred losses and loss adjustment expenses related to:        
Current year 1,276,235 1,173,862    
Prior years 10,758 63,919    
Total incurred losses and loss adjustment expenses 1,286,993 1,237,781    
Loss and loss adjustment expense payments related to:        
Current year 701,282 640,496    
Prior years 557,457 540,803    
Total payments 1,258,739 1,181,299    
Net reserves at June 30 1,676,807 1,503,094    
Gross reserves at June 30 $ 1,783,924 $ 1,549,850