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Investments - Sales of Fixed Maturities and Equity Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds received | $ 625,527 | $ 500,760 | $ 429,251
Proceeds received | 25,498 | 50,113 | 21,210
Fixed maturity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross gains realized | 10,536 | 13,570 | 15,915
Gross losses realized | (14,932) | (11,842) | (4,163)
Equity securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross gains realized | 8,592 | 7,753 | 2,869
Gross losses realized | $ (917) | $ (1,972) | $ (935)

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