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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Investment [Line Items] |  |
Equity investments, trading | $ 310,252 | $ 388,254
Financials |  |
Investment [Line Items] |  |
Equity investments, trading | 200,357 | 253,543
Communications and technology |  |
Investment [Line Items] |  |
Equity investments, trading | 42,333 | 49,526
Industrial, utilities and energy |  |
Investment [Line Items] |  |
Equity investments, trading | 24,520 | 34,325
Consumer |  |
Investment [Line Items] |  |
Equity investments, trading | 20,639 | 24,779
Healthcare |  |
Investment [Line Items] |  |
Equity investments, trading | 18,925 | 21,364
Basic materials |  |
Investment [Line Items] |  |
Equity investments, trading | $ 3,478 | $ 4,717

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- Definition Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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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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