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Summary of Investments (Net Realized Investment Gains and Losses and Proceeds) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | $ 26,713 | $ (7,864)
Debt Securities, Available-for-sale [Abstract] |  |
Proceeds from sale of available-for-sale investments | 36,490 | 0
Gross realized gains | 30 | 0
Gross realized losses | 13 | 0
Fixed Maturities | Available-for-sale |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | 150 | 4
Fixed Maturities | Change in fair value |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | 1,746 | (111)
Fixed Maturities | Sales |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | 0 | 556
Equity securities | Change in fair value |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | 24,634 | (9,188)
Equity securities | Sales |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | 198 | 875
Mortgages |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | (15) | 0
Continuing and Discontinuing Operations |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | 26,713 | (8,921)
Discontinued Operations |  |
Gain (Loss) on Securities [Line Items] |  |
Net realized investment gains (losses) | $ 0 | $ (1,057)

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