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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds received, Fixed maturity securities | $ 100,129 | $ 118,818 | $ 190,023 | $ 229,690
Proceeds received, Equity securities | 3,735 | 11,507 | 5,783 | 16,996
Fixed maturity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross gains realized | 2,352 | 4,080 | 4,022 | 6,569
Gross losses realized | (1,584) | (496) | (1,637) | (1,377)
Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross gains realized | 977 | 1,702 | 1,593 | 2,750
Gross losses realized | $ (147) | $ (236) | $ (181) | $ (428)

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