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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Premiums receivable $ 3,781,542 $ 2,894,631
Premium receivable, allowance for credit loss 2,776 5,961
Reinsurance recoverable 4,300,000 2,900,000
Reinsurance recoverable, allowance for credit loss $ 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 19.90% 15.30%
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 8.40% 10.80%
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 4.30% 6.70%
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 18.00% 13.20%
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 13.90% 13.00%
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 11.20% 6.70%
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 46.90% 45.20%
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 52.10% 53.40%
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 1.00% 1.40%