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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fixed maturity securities |  |  |  |
Proceeds received | $ 196,004 | $ 442,015 | $ 294,162 | $ 501,739
Gross gains realized | 5,506 | 147,774 | 10,285 | 148,316
Gross losses realized | (5,625) | (5,976) | (5,893) | (6,081)
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract] |  |  |  |
Proceeds received | 10,602 | 1,633 | 12,059 | 17,122
Gross gains realized | 1,721 | 389 | 2,040 | 5,134
Gross losses realized | $ (1,249) | (166) | (1,805) | (510)
Investment gain realized on transfer |  |  | $ 135,300 |
Reinsurance block of in-force fixed and variable annuity business |  | $ 2,900,000 |  | $ 2,900,000

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- Definition Proceeds From Sale And Maturity Of Marketable Securities (Excluding FHLB Repayments) + References No definition available. + Details
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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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