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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
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

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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