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Investments - Amortized Cost and Fair Value of Available-for-sale Fixed-maturity Securities in Default (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Investments Debt And Equity Securities [Abstract] |  |
Available-for-sale fixed-maturity securities in default, amortized cost | $ 10 | $ 503
Available-for-sale fixed-maturity securities in default, fair value | $ 201 | $ 654

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