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Investments - Amortized Cost and Fair Value of Available-for-sale Fixed-maturity Securities in Default (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale fixed-maturity securities in default, amortized cost | $ 5 | $ 138
Available-for-sale fixed-maturity securities in default, fair value | $ 93 | $ 262

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