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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Dec. 20, 2019
USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Current year losses $ 4,986,456 $ 5,264,327 $ 4,815,967    
Increase (decrease) in insurance business (63,558) 387,076 (293,386)    
Reinsurance recoverable for paid and unpaid losses 1,763,471 1,787,648      
Partially offset, related to development on reserves $ 415,585 174,121      
Contracts of insurance and reinsurance received claims during the past three years, in years 20 years        
Business acquisition, cost of acquired entity and operations, cash paid       $ 140,279  
Liabilites retroceded, percentage       100.00%  
Maximum liability retroceded       $ 440,279 $ 450,298
Decrease in amount of liabliities retroceded $ 43,362        
Total amount of liabilities retroceded       $ 300,000  
Number of exposure groupings | Item 200        
Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage 5.00%        
Property and Short-Tail Business [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Increase (decrease) in reinsurance business     (238,378)    
Catastrophe Losses [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Increase (decrease) in insurance business $ (693,458) $ 561,197      
Workers Compensation [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Increase (decrease) in insurance business     55,007    
Mt Logan Re [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Reinsurance recoverable for paid and unpaid losses $ 682,845        
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage 38.70%        
Zurich Vericherungs Gesellschaft [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Reinsurance recoverable for paid and unpaid losses $ 95,481        
Zurich Vericherungs Gesellschaft [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage 5.40%        
Munich Reinsurance Company [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Reinsurance recoverable for paid and unpaid losses $ 147,807        
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member] | Reinsurer Concentration Risk [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Concentration risk, percentage 8.40%        
A And E [Member]          
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]          
Partially offset, related to development on reserves     $ 37,137