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Investments, Summary of Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Summary of realized investment gains (losses) [Abstract] |  |
Gains | $ 2,684 | $ 5,501
Losses | (89) | (644)
Realized investment gains, net | 2,595 | 4,857
Proceeds from sales of investments [Abstract] |  |
Total proceeds | $ 62,361 | 84,873
Percentage of investment grade securities in bond portfolio | 88.00% |
Fixed Maturities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | $ 1,119 | 2,347
Losses | (89) | (628)
Realized investment gains, net | 1,030 | 1,719
Proceeds from sales of investments [Abstract] |  |
Total proceeds | 59,072 | 80,995
Equity Securities [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 0 | 0
Losses | 0 | (16)
Realized investment gains, net | 0 | (16)
Other Investments [Member] |  |
Summary of realized investment gains (losses) [Abstract] |  |
Gains | 1,565 | 3,154
Losses | 0 | 0
Realized investment gains, net | 1,565 | 3,154
Proceeds from sales of investments [Abstract] |  |
Total proceeds | $ 3,289 | $ 3,878

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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