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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Summary of realized investment gains (losses) [Abstract] |  |
Gains | $ 6,983 | $ 9,310
Losses | (1,829) | (142)
Realized investment gains (losses), net | 5,154 | 9,168
Proceeds from sales of investments [Abstract] |  |
Total proceeds | 40,917 | 83,992
Fixed Maturities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 884 | 2,226
Losses | (1,829) | (142)
Realized investment gains (losses), net | (945) | 2,084
Proceeds from sales of investments [Abstract] |  |
Total proceeds | 30,078 | 72,760
Equity Securities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 272 | 1,044
Losses | 0 | 0
Realized investment gains (losses), net | 272 | 1,044
Proceeds from sales of investments [Abstract] |  |
Total proceeds | 0 | 1,579
Other Investments [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 5,827 | 6,040
Losses | 0 | 0
Realized investment gains (losses), net | 5,827 | 6,040
Proceeds from sales of investments [Abstract] |  |
Total proceeds | $ 10,839 | $ 9,653

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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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