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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | $ 493,056 | $ 322,098
Financials |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 228,777 | 222,190
Communications and technology |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 84,522 | 31,376
Industrial, utilities and energy |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 71,168 | 28,859
Consumer |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 50,764 | 19,522
Healthcare |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 48,572 | 16,582
Basic materials |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | $ 9,253 | $ 3,569

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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=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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