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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%

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