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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2015
USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses $ 7,400,303 $ 6,149,410 $ 4,986,456  
Prior year losses (9,050) 401,427 $ (63,558)  
Reinsurance recoverable for paid and unpaid losses $ 2,100,000 2,000,000    
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       $ 140,300
Liabilities retroceded, percentage       100.00%
Maximum liability retroceded   450,300   $ 440,300
Decrease in amount of liabilities retroceded   43,400    
Total amount of liabilities retroceded       $ 300,000
Number of exposure groupings | Item 200      
Other Retrocessionaire [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 5.00%      
Catastrophe Losses [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses $ 710,000 (120,500)    
Covid-19 [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses   511,100    
Higher Premiums Earned [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Current year losses 540,900 $ 772,400    
Mt Logan Re [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 691,400      
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 33.70%      
Munich Reinsurance Company [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 221,900      
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 10.80%      
Endurance Re [Member]        
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]        
Reinsurance recoverable for paid and unpaid losses $ 115,100      
Endurance 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 5.60%