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Investments, Fair Value Measured on a Recurring Basis (Details) - Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | $ 243,591 | $ 252,318
Fixed Maturities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 217,848 | 215,108
Equity Securities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 18,936 | 23,355
Cash Equivalents [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 6,807 | 13,855
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 20,464 | 31,828
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Maturities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 13,657 | 17,973
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash Equivalents [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 6,807 | 13,855
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 221,788 | 219,121
Significant Other Observable Inputs (Level 2) [Member] | Fixed Maturities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 216,509 | 213,739
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value | [1] | 5,279 | 5,382
Significant Other Observable Inputs (Level 2) [Member] | Cash Equivalents [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 1,339 | 1,369
Significant Unobservable Inputs (Level 3) [Member] | Fixed Maturities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value | [1] | 1,339 | 1,369
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Cash Equivalents [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Assets at fair value |  | $ 0 | $ 0
[1] | All underlying securities are financial service industry related.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Period Type: |

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- Details
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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |