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Investments - Net Investment Gains (Losses) By Transaction Type (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |
Impairment write-downs | $ (1,105) | $ 0 | $ (1,778)
Change in intent write-downs | (275) | (1,530) | (10,842)
Net OTTI losses recognized in earnings | (1,380) | (1,530) | (12,620)
Sales and other, net | 151,495 | 3,491 | 7,756
Change in fair value - equity securities | 7,308 | (18,323) | 0
Change in fair value and gains realized on settlements - derivatives | (4,083) | 3,819 | 1,458
Total | $ 153,340 | $ (12,543) | $ (3,406)

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- Definition Other-than-temporary Impairment Loss, Debt Securities, Portion Recognized In Earnings, Impairment Write-Downs + References No definition available. + Details
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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=118954083&loc=SL6284422-111562 + Details
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