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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Equity investments trading | $ 702,617 | $ 436,931
Financials |  |
Schedule of Investments [Line Items] |  |
Equity investments trading | 452,765 | 248,189
Communications and technology |  |
Schedule of Investments [Line Items] |  |
Equity investments trading | 119,592 | 79,206
Consumer |  |
Schedule of Investments [Line Items] |  |
Equity investments trading | 44,477 | 35,987
Industrial, utilities and energy |  |
Schedule of Investments [Line Items] |  |
Equity investments trading | 43,380 | 38,583
Healthcare |  |
Schedule of Investments [Line Items] |  |
Equity investments trading | 35,140 | 29,510
Basic materials |  |
Schedule of Investments [Line Items] |  |
Equity investments trading | $ 7,263 | $ 5,456

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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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