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Reinsurance (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Premiums receivable $ 2,894,631 $ 2,599,896
Premium receivable, allowance for credit loss 5,961 2,096
Reinsurance recoverable 2,900,000 2,800,000
Reinsurance recoverable, allowance for credit loss $ 6,334 $ 7,265
Reinsurance Recoverable | Largest reinsurance recoverable, Customer One    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 15.30% 12.70%
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 10.80% 7.20%
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 6.70% 7.00%
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer One    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 13.20% 18.10%
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 13.00% 7.90%
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 6.70% 7.20%
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Concentration risk percentage 45.20% 57.50%
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 53.40% 41.00%
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 1.40% 1.50%