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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | $ 469,747 | $ 407,637
Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 89,346 | 99,640
Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 347,392 | 229,685
Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 33,009 | 78,312
U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 4,009 | 3,801
Equity Securities Common Stock Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 26,130 | 38,816
Equity Securities Common Stock Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 10,868 | 4,999
Equity Securities Common Stock Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 8,215 | 6,945
Equity Securities Exchange-traded and mutual funds Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 21,989 | 25,997
Equity Securities Exchange-traded and mutual funds Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 10,265 | 16,878
Equity Securities Exchange-traded and mutual funds Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 5,068 |
Equity Securities Exchange-traded and mutual funds Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 2,506 | 1,710
Other investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 317 | 371
Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 469,747 | 407,637
Fair Value Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 89,346 | 99,640
Fair Value Measurements, Recurring [Member] | Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 347,392 | 229,685
Fair Value Measurements, Recurring [Member] | Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 33,009 | 78,312
Fair Value Measurements, Recurring [Member] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 4,009 | 3,801
Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 26,130 | 38,816
Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 10,868 | 4,999
Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 8,215 | 6,945
Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 21,989 | 25,997
Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 10,265 | 16,878
Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 5,068 |
Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 2,506 | 1,710
Fair Value Measurements, Recurring [Member] | Non-hedging derivate liability, net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | (21) |
Fair Value Measurements, Recurring [Member] | Non-hedging derivative asset [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  | 123
Fair Value Measurements, Recurring [Member] | Other investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 317 | 371
Level 1 [Member] | Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 465,759 | 403,869
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 85,358 | 95,872
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 347,392 | 229,685
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 33,009 | 78,312
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  | 174
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 26,130 | 38,816
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 10,868 | 4,999
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 8,215 | 6,927
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 21,989 | 25,997
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 10,265 | 16,878
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 5,068 |
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 2,506 | 1,710
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Other investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 317 | 371
Level 2 [Member] | Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 3,988 | 3,768
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 3,988 | 3,768
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 4,009 | 3,627
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  | 18
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Non-hedging derivate liability, net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | (21) |
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Non-hedging derivative asset [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  | 123
Level 3 [Member] | Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Common Stock Other [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Metals and mining [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Agriculture [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Energy [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Equity Securities Exchange-traded and mutual funds Indices [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Non-hedging derivate liability, net [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Non-hedging derivative asset [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Other investments [Member] | Categories of Investments, Marketable Securities, Trading Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |

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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph 2, 3 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column C -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 14 -Paragraph Column E -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 7 -Article 12 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611133-123010 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 6 -Article 12 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column C -Article 12 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column C -Article 12 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3, 4 -Article 12 + Details
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