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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fixed maturity securities |  |  |  |
Proceeds received | $ 58,604 | $ 149,319 | $ 352,766 | $ 651,058
Gross gains realized | 3,744 | 1,258 | 14,029 | 149,574
Gross losses realized | (31) | (1,047) | (5,924) | (7,128)
Equity Securities, FV-NI, Realized Gain (Loss) [Abstract] |  |  |  |
Proceeds received | 309 | 1,367 | 12,368 | 18,489
Gross gains realized | 79 | 428 | 2,119 | 5,562
Gross losses realized | $ (38) | (32) | (1,843) | (542)
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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