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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Proceeds received from sales of fixed maturities and equity securities |  |
Proceeds received, Fixed maturity securities | $ 89,894 | $ 110,872
Proceeds received, Equity securities | 2,048 | 5,489
Fixed maturity securities |  |
Proceeds received from sales of fixed maturities and equity securities |  |
Gross gains realized | 1,670 | 2,489
Gross losses realized | (53) | (881)
Equity securities |  |
Proceeds received from sales of fixed maturities and equity securities |  |
Gross gains realized | 616 | 1,048
Gross losses realized | $ (34) | $ (192)

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