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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 462,198	$ 322,098
Financials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	217,150	222,190
Communications and technology
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	79,478	31,376
Industrial, utilities and energy
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	64,547	28,859
Consumer
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	50,540	19,522
Healthcare
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	42,904	16,582
Basic materials
Schedule of Trading Securities and Other Trading Assets [Line Items]
Equity investments trading	$ 7,579	$ 3,569

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- Definition

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+ References

No definition available.

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- Definition

Fair value of investments in trading equity securities and other forms of trading securities that provide ownership interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 45



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 210



-Section S99



-Paragraph 1



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-Name Accounting Standards Codification



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-Paragraph 1



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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 6: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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