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Investments in Securities and Fair Value Investments in Securities (Schedule of Fixed Maturity Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] |  |
Due in one year or less | $ 12,605 |
Due after one year through five years | 31,988 |
Due five years through ten years | 42,163 |
Due after ten years | 958 |
Total | 87,714 | $ 100,314
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Due in one year or less | 12,606 |
Due after one year through five years | 32,808 |
Due five years through ten years | 42,310 |
Due after ten years | 1,233 |
Total | $ 88,957 |

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