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Reinsurance - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Premiums receivable $ 5,139,471 $ 3,781,542  
Premium receivable, allowance for credit loss 4,606 2,776 $ 5,961
Reinsurance recoverable 4,700,000 4,300,000  
Reinsurance recoverable, allowance for credit loss $ 12,169 $ 8,344 $ 6,334
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer One      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 20.80% 19.90%  
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 7.00% 8.40%  
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 5.40% 4.30%  
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 14.30% 18.00%  
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 9.10% 13.90%  
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 8.00% 11.20%  
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 47.20% 46.90%  
Rated A- or higher | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 52.00% 52.10%  
Rated lower than A- | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Concentration risk percentage 0.80% 1.00%