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Investments - Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Gain (Loss) on Securities [Line Items] |  |  |
Net investment gains (losses) | $ (12,543) | $ (3,406) | $ 4,123
Fixed maturity securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net investment gains (losses) | (5,713) | (8,867) | 5,784
Equity securities |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net investment gains (losses) | (10,649) | 4,003 | (608)
Short-term and other investments |  |  |
Gain (Loss) on Securities [Line Items] |  |  |
Net investment gains (losses) | $ 3,819 | $ 1,458 | $ (1,053)

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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