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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Summary of realized investment gains (losses) [Abstract] |  |  |  |
Gross gains | $ 484 | $ 539 | $ 1,101 | $ 2,879
Gross losses | 0 | 0 | (304) | (61)
Realized investment gains, net | $ 484 | $ 539 | $ 797 | $ 2,818

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- Definition Gains realized on investments. + References No definition available. + Details
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- Definition Losses realized on investments. + References No definition available. + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- References No definition available. + Details
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