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Investments - Summary of Proceeds and Gains (Losses) Realized on Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Proceeds received, Fixed maturity securities | $ 118,818 | $ 174,944 | $ 229,690 | $ 257,033
Proceeds received, Equity securities | 11,507 | 6,474 | 16,996 | 12,622
Fixed maturity securities |  |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Gross gains realized | 4,080 | 8,382 | 6,569 | 10,858
Gross losses realized | (496) | (948) | (1,377) | (1,440)
Equity securities |  |  |  |
Proceeds received from sales of fixed maturities and equity securities |  |  |  |
Gross gains realized | 1,702 | 650 | 2,750 | 1,170
Gross losses realized | $ (236) | $ (195) | $ (428) | $ (841)

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