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Investments (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | $ 4,123 | $ 12,713 | $ 10,917
Fixed Maturities [Member] |  |  |
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | 5,784 | 10,289 | 8,150
Equity Securities [Member] |  |  |
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | (608) | 1,378 | 2,793
Short Term And Other Investments [Member] |  |  |
Summary of realized investment gains (losses) |  |  |
Net realized investment gains | $ (1,053) | $ 1,046 | $ (26)

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