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Investments, Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Fixed maturities |  | $ 208,856 | $ 215,108
Equity securities |  | 23,025 | 23,355
Recurring [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Fixed maturities |  | 208,856 | 215,108
Equity securities |  | 23,025 | 23,355
Cash equivalents |  | 6,648 | 13,855
Assets at fair value |  | 238,529 | 252,318
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Fixed maturities |  | 0 | 0
Equity securities |  | 17,704 | 17,973
Cash equivalents |  | 6,648 | 13,855
Assets at fair value |  | 24,352 | 31,828
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Fixed maturities |  | 207,510 | 213,739
Equity securities | [1] | 5,321 | 5,382
Cash equivalents |  | 0 | 0
Assets at fair value |  | 212,831 | 219,121
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Financial instruments carried at fair value measured on a recurring basis [Abstract] |  |  |
Fixed maturities | [1] | 1,346 | 1,369
Equity securities |  | 0 | 0
Cash equivalents |  | 0 | 0
Assets at fair value |  | $ 1,346 | $ 1,369
[1] | All underlying securities are financial service industry related.

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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