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Investments in Securities and Fair Value Investments in Securities (Schedule of Earnings on Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | $ 4,619 | $ 4,445 | $ 4,684
Fixed maturity securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 2,809 | 3,037 | 3,506
Equity securities |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 1,308 | 1,203 | 1,158
Invested cash and other short-term investments |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | 492 | 202 | 20
Miscellaneous interest |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |
Investment income | $ 10 | $ 3 | $ 0

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