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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investment [Line Items] |  |
Equity investments trading | $ 388,254 | $ 383,313
Financials |  |
Investment [Line Items] |  |
Equity investments trading | 253,543 | 275,065
Communications and technology |  |
Investment [Line Items] |  |
Equity investments trading | 49,526 | 36,770
Industrial, utilities and energy |  |
Investment [Line Items] |  |
Equity investments trading | 34,325 | 30,303
Consumer |  |
Investment [Line Items] |  |
Equity investments trading | 24,779 | 20,501
Healthcare |  |
Investment [Line Items] |  |
Equity investments trading | 21,364 | 17,245
Basic materials |  |
Investment [Line Items] |  |
Equity investments trading | $ 4,717 | $ 3,429

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