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Summary of Investments (Unrealized Appreciation) (Details) - Continuing and Discontinuing Operations - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Gain (Loss) on Securities [Line Items] |  |
Available-for-sale fixed maturities | $ 33,264 | $ (59,126)
Deferred policy acquisition costs | 0 | 7,274
Income tax effect | (6,985) | 10,890
Net unrealized investment depreciation of discontinued operations, sold | 0 | 6,714
Cumulative change in accounting principles | 0 | (191,244)
Total change in net unrealized investment appreciation, net of tax | $ 26,279 | $ (225,492)

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