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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Proceeds received, Fixed maturity securities | $ 85,841 | $ 94,706 | $ 315,531 | $ 351,739
Proceeds received, Equity securities | 3,514 | 4,479 | 20,510 | 17,101
Fixed maturity securities |  |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Gross gains realized | 2,293 | 2,966 | 8,862 | 13,824
Gross losses realized | (181) | (102) | (1,558) | (1,542)
Equity securities |  |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Gross gains realized | 477 | 790 | 3,227 | 1,960
Gross losses realized | $ (293) | $ (21) | $ (721) | $ (862)

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