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Investments (Schedule of Fair Value of Equity Investments Trading) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | $ 245,267 | $ 254,776
Financials |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 142,374 | 152,905
Consumer |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 45,179 | 44,115
Industrial, utilities and energy |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 25,239 | 25,350
Healthcare |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 15,254 | 15,340
Basic materials |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | 12,937 | 12,766
Communications and technology |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity investments trading | $ 4,284 | $ 4,300

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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 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: 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 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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: 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 + Details
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