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Investments in Securities and Fair Value Investments in Securities (Schedule of Cost-method Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Measurement Alternative Investments |  |
Beginning of Period | $ 5,439 | $ 4,744
Amounts Impairment | 0 | 0
Observable Changes | 0 | 0
Purchases and Additional Commitments Paid | 1,486 | 1,082
Sales, Returns of Capital, and Other Reductions | (336) | (387)
End of Period | $ 6,589 | $ 5,439

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