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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 389,937	$ 310,252
Financials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	222,604	200,357
Communications and technology
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	66,428	42,333
Industrial, utilities and energy
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	37,574	24,520
Consumer
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	31,378	20,639
Healthcare
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	26,867	18,925
Basic materials
Debt and Equity Securities, FV-NI [Line Items]
Equity investments trading	$ 5,086	$ 3,478

X

- 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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- Definition

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+ References

No definition available.

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