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REINSURANCE - Narrative (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Ceded Credit Risk [Line Items]            
Premiums receivable $ 5,479,305 $ 3,781,542        
Premium receivable, allowance for credit loss 4,769 2,776 $ 4,350 $ 4,350 $ 2,776 $ 2,776
Reinsurance recoverable 5,000,000 4,300,000        
Reinsurance recoverable, allowance for credit loss $ 12,087 $ 8,344 $ 9,005 $ 9,005 $ 8,344 $ 8,344
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 21.00% 19.90%        
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 6.70% 8.40%        
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 4.80% 4.30%        
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 14.40% 18.00%        
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 11.30% 13.90%        
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 7.90% 11.20%        
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 46.00% 46.90%        
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 53.30% 52.10%        
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating            
Ceded Credit Risk [Line Items]            
Concentration risk, percentage 0.80% 1.00%