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Investments - Net Effect on Stockholders' Equity of Unrealized Gains and Losses on Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [Abstract] |  |
Net unrealized investment gains including OTTI, Fixed-maturity and Equity securities | $ 110,400 | $ 49,286
OTTI | 103 | 109
Net unrealized investment gains excluding OTTI | 110,503 | 49,395
Less deferred income taxes | (38,676) | (17,288)
Net unrealized investment gains excluding OTTI, net of tax | $ 71,827 | $ 32,107

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