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Summary of Investments (Unrealized Appreciation) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Change in net unrealized investment appreciation |  |
Available-for-sale fixed maturities | $ (29,691) | $ 5,696
Income tax effect | 6,235 | (1,196)
Total change in net unrealized investment appreciation, net of tax | $ (23,456) | $ 4,500

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