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Investments - Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | $ 2,469 | $ (2,156) | $ (12,833) | $ 151,594
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | 2,656 | 206 | 3,116 | 141,955
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | 3,982 | 1,478 | (3,670) | 13,311
Short-term investments and other |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | $ (4,169) | $ (3,840) | $ (12,279) | $ (3,672)

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- Definition Amount of realized gain (loss) on investment. + 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=120400993&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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