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Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Subsidiary | Dec. 31, 2015 USD ($)
Principles of Consolidation [Abstract] |  |
Number of insurance subsidiaries owned by the parent | Subsidiary | 4 |
Number of non-insurance subsidiaries owned by the parent | Subsidiary | 1 |
Investments [Abstract] |  |
Estimated fair value | $ 1,264 | $ 2,237
Recently Issued Accounting Standards [Abstract] |  |
Equity securities available-for-sale | 20,257 | $ 23,131
ASU 2016-01 [Member] |  |
Recently Issued Accounting Standards [Abstract] |  |
Equity securities available-for-sale | 20,257 |
Equity securities unrealized gains, net of tax | 5,723 |
New accounting pronouncement, effect of change on income, net of tax | $ (2,193) |

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