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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | $ 499,497 | $ 469,747
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
Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 13,968 |
Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 482,876 | 347,392
Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 2,653 | 33,009
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
U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 8,013 |
Corporate bonds [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 5,955 |
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
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
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
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
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
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
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
Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 499,497 | 469,747
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
Fair Value Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 13,968 |
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 | 482,876 | 347,392
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 | 2,653 | 33,009
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
Fair Value Measurements, Recurring [Member] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 8,013 |
Fair Value Measurements, Recurring [Member] | Corporate bonds [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 5,955 |
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
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
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
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
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
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
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] | 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
Level 1 [Member] | Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 485,529 | 465,759
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
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 | 482,876 | 347,392
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 | 2,653 | 33,009
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
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
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
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
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
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
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
Level 2 [Member] | Fair Value Measurements, Recurring [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 13,968 | 3,988
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
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 13,968 |
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
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 8,013 |
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Corporate bonds [Member] | Categories of Investments, Marketable Securities, Available-for-sale Securities [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 5,955 |
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 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] | Categories of Investments, Marketable Securities, Available-for-sale 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] | U.S. government obligations and agencies [Member] | Categories of Investments, Marketable Securities, Available-for-sale 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] | Corporate bonds [Member] | Categories of Investments, Marketable Securities, Available-for-sale 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] | 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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