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Investments in Securities and Fair Value Investments in Securities (Schedule of Gross Realized Gains and Losses on Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items] |  |
Total, gross realized gains | $ 3,458 | $ 1,725
Total, gross realized losses | (3,147) | (382)
Net realized gains from securities | 311 | 1,343
Gains on other investments | 31 | 3
Losses on investments | (9) | (6)
Other investments, realized investment gains (losses) | 22 | (3)
Net realized investment gains | 333 | 1,340
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, gross realized gains | 30 | 0
Common stocks and nonredeemable preferred stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, realized gain (loss) | 3,428 | 1,725
Total, gross realized losses | (2,665) | (382)
Other than temporary impairment of securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, gross realized losses | $ (482) | $ 0

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