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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 577,090	$ 702,617
Financials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	227,257	452,765
Communications and technology
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	93,458	119,592
Consumer
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	58,699	44,477
Industrial, utilities and energy
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	32,891	43,380
Healthcare
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	32,041	35,140
Basic materials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	6,051	7,263
Exchange traded funds
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 126,693	$ 0

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ 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=123594786&loc=SL75136599-209740

+ Details

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- Definition

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+ References

No definition available.

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