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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds received, Fixed maturity securities | $ 442,015 | $ 100,129 | $ 501,739 | $ 190,023
Proceeds received, Equity securities | 1,633 | 3,735 | 17,122 | 5,783
Investment gain realized on transfer |  |  | 135,300 |
Reinsurance block of in-force fixed and variable annuity business | 2,900,000 |  | 2,900,000 |
Fixed maturity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross gains realized | 147,774 | 2,352 | 148,316 | 4,022
Gross losses realized | (5,976) | (1,584) | (6,081) | (1,637)
Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross gains realized | 389 | 977 | 5,134 | 1,593
Gross losses realized | $ (166) | $ (147) | $ (510) | $ (181)

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