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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Ceded Credit Risk [Line Items]    
Premiums receivable $ 4,851,513 $ 3,781,542
Premium receivable, allowance for credit loss 2,776 2,776
Reinsurance recoverable 4,300,000 4,300,000
Reinsurance recoverable, allowance for credit loss $ 8,344 $ 8,344
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 20.00% 19.90%
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 7.70% 8.40%
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 4.60% 4.30%
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 15.20% 18.00%
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 10.30% 13.90%
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 9.40% 11.20%
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 48.30% 46.90%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 50.80% 52.10%
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating    
Ceded Credit Risk [Line Items]    
Concentration risk, percentage 1.00% 1.00%