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Investments - Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gain (Loss) on Investments [Line Items] |  |  |
Net realized investment gains (losses) | $ (3,406) | $ 4,123 | $ 12,713
Fixed maturity securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net realized investment gains (losses) | (8,867) | 5,784 | 10,289
Equity securities |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net realized investment gains (losses) | 4,003 | (608) | 1,378
Short-term and other investments |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net realized investment gains (losses) | $ 1,458 | $ (1,053) | $ 1,046

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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=75031664&loc=d3e22529-158502 + Details
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