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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2015
USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses $ 6,149,410 $ 4,986,456 $ 5,264,327  
Increase (decrease) in insurance business 401,427 (63,558) 387,076  
Reinsurance recoverable for paid and unpaid losses $ 1,994,555 1,763,471    
Partially offset, related to development on reserves     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
Liabilities retroceded, percentage       100.00%
Maximum liability retroceded   450,298   $ 440,279
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%      
Catastrophe Losses [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses $ (120,500) (693,458)    
Increase (decrease) in insurance business     $ 561,197  
Covid-19 [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses 511,056      
Higher Premiums Earned [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses 772,399 $ 415,585    
Mt Logan Re [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 699,734      
Mt Logan Re [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Concentration risk, percentage 35.10%      
Munich Reinsurance Company [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 211,594      
Munich Reinsurance Company [Member] | Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Concentration risk, percentage 10.60%