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Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - Mt. Logan Re Segregated Accounts [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Effects of Reinsurance [Line Items] |  |
Ceded written premiums | $ 80,028 | $ 81,036
Ceded earned premiums | 56,732 | 61,409
Ceded losses and LAE | 45,613 | 21,069
Assumed written premiums | 2,309 | 3,043
Assumed earned premiums | 2,309 | 3,043
Assumed losses and LAE |  |

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