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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | $ 413,271 | $ 388,254
Financials |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 262,173 | 253,543
Communications and technology |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 60,235 | 49,526
Industrial, utilities and energy |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 34,755 | 34,325
Consumer |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 26,649 | 24,779
Healthcare |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | 25,250 | 21,364
Basic materials |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity investments trading | $ 4,209 | $ 4,717

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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