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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Ceded Credit Risk [Line Items]            
Premiums receivable $ 5,408,217 $ 3,781,542        
Premium receivable, allowance for credit loss 4,350 2,776 $ 2,776 $ 3,725 $ 3,782 $ 5,961
Reinsurance recoverable 4,200,000 4,300,000        
Reinsurance recoverable, allowance for credit loss $ 9,005 $ 8,344 $ 8,344 $ 7,024 $ 6,605 $ 6,334
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 19.90% 19.90%        
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 8.10% 8.40%        
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 5.00% 4.30%        
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 13.40% 18.00%        
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 8.80% 13.90%        
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 8.30% 11.20%        
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 46.40% 46.90%        
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 52.60% 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%