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Investments - Net Effect on Stockholders' Equity of Unrealized Gains and Losses on Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] |  |  |
Net unrealized investment gains on available-for-sale securities including OTTI, Available-for-sale securities | $ 1,934 | $ 60,292 | [1]
OTTI | 172 | 174 |
Net unrealized investment gains on available-for-sale securities excluding OTTI | 2,106 | 60,466 |
Less deferred income taxes | (613) | (20,780) |
Net unrealized investment gains on available-for-sale securities excluding OTTI, net of tax | $ 1,493 | $ 39,686 |
[1] | Includes $9.8 million of net unrealized gains for equity securities recognized in accumulated other comprehensive income (loss) prior to the adoption of ASU 2016-01.

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