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Reinsurance (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Reinsurance recoverable | $ 2,372,221 | $ 1,586,630 | $ 279,564
Allowance for Reinsurance Recoverable |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Valuation allowance recorded against reinsurance recoverable | $ 9,000 | $ 7,000 |
Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 15.50% | 10.40% |
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 6.70% | 7.50% |
Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 6.50% | 7.30% |
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer One |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 16.20% | 11.10% |
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Two |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 14.80% | 9.20% |
Allowance for Reinsurance Recoverable | Largest reinsurance recoverable, Customer Three |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 12.30% | 8.40% |
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Concentration risk percentage | 60.80% | 54.50% |
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 | 38.00% | 44.50% |
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 | 1.20% | 1.00% |

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