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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross realized gains | $ 1,030 | $ 1,487 | $ 1,148
Total, Gross realized losses | (1,147) | (286) | (409)
Net realized (loss) gain | (117) | 1,201 | 739
Impairments on other investments | 0 | (182) | 0
Gains on other investments | 7 | 22 | 29
Other investments, Realized Investment Gains (Losses) | 7 | (160) | 29
Net realized (loss) gain on investments | (110) | 1,041 | 768
Corporate debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross realized gains | 0 | 0 | 119
Common stocks and nonredeemable preferred stocks |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity Securities, Realized Gain (Loss) | 1,030 | 1,487 | 954
Total, Gross realized losses | (1,147) | (260) | (173)
Auction rate securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross realized gains | 0 | 0 | 75
General obligations of U.S. states, territories and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross realized losses | 0 | 0 | (1)
Special revenue issuer obligations of U S states, territories and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross realized losses | 0 | 0 | (1)
Other than temporary impairment of securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Total, Gross realized losses | $ 0 | $ (26) | $ (234)

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