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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Summary of realized investment gains (losses) [Abstract] |  |
Gains | $ 3,224 | $ 6,983
Losses | (1,650) | (1,829)
Realized investment gains (losses), net | 1,574 | 5,154
Fixed Maturities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 2,003 | 884
Losses | (1,650) | (1,829)
Realized investment gains (losses), net | 353 | (945)
Proceeds from Sales of Available-for-sale [Abstract] |  |
Sales proceeds | 117,530 | 30,078
Gross gains | 2,003 | 884
Gross losses | (1,650) | (1,829)
Equity Securities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 1,221 | 272
Losses | 0 | 0
Realized investment gains (losses), net | 1,221 | 272
Other Investments [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 0 | 5,827
Losses | 0 | 0
Realized investment gains (losses), net | $ 0 | $ 5,827

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- Definition Amount of realized gain on 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 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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