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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Reinsurance recoverable | $ 2,791,297 | $ 2,372,221 | $ 1,586,630
Allowance for Reinsurance Recoverable |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation allowance recorded against reinsurance recoverable | $ 7,300 | $ 9,000 |
Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 12.70% | 15.50% |
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 7.20% | 6.70% |
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 7.00% | 6.50% |
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 18.10% | 16.20% |
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 7.90% | 14.80% |
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 7.20% | 12.30% |
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 57.50% | 60.80% |
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 | 41.00% | 38.00% |
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 | 1.50% | 1.20% |

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