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Investments - Realized Investment Gains (Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | $ 3,162 | $ 146,333 | $ (15,302) | $ 153,750
Fixed maturity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | (642) | 141,548 | 460 | 141,749
Equity securities |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | 7,071 | 3,926 | (7,652) | 11,833
Short-term investments and other |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Net investment gains (losses) | $ (3,267) | $ 859 | $ (8,110) | $ 168

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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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