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REINSURANCE - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Ceded Credit Risk [Line Items]      
Premiums receivable $ 7,290,228 $ 7,280,682  
Premium receivable, allowance for credit loss 4,631 3,514 $ 4,606
Reinsurance recoverable 4,500,000 5,300,000  
Reinsurance recoverable, allowance for credit loss $ 11,730 $ 13,279 $ 12,169
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer One      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 12.60% 17.60%  
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 11.00% 14.30%  
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 8.30% 8.70%  
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 23.90% 10.90%  
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 7.20% 10.70%  
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 5.90% 8.10%  
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 55.70% 60.60%  
Rated A- or higher | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 43.20% 38.50%  
Rated lower than A- | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk      
Ceded Credit Risk [Line Items]      
Concentration risk , percentage 1.00% 0.90%