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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2021
Ceded Credit Risk [Line Items]      
Premiums receivable $ 4,141,899 $ 2,894,631  
Premium receivable, allowance for credit loss 3,729 5,961 $ 3,725
Reinsurance recoverable 4,200,000 2,900,000  
Reinsurance recoverable, allowance for credit loss $ 7,518 $ 6,334 $ 7,024
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 18.50% 15.30%  
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 8.80% 10.80%  
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 4.40% 6.70%  
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 15.30% 13.20%  
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 14.40% 13.00%  
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 9.50% 6.70%  
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 47.20% 45.20%  
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 51.70% 53.40%  
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating      
Ceded Credit Risk [Line Items]      
Concentration risk, percentage 1.10% 1.40%