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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | $ 514,111 | $ 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 | 53,301 | 99,640
Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 365,675 | 229,685
Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 95,135 | 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 | 4,008 | 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 | 9,235 | 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 | 8,067 | 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 | 9,989 | 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 | 6,527 | 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 | 7,015 | 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 | 2,935 |
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 | 5,107 | 1,710
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 | 101 | 123
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] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 509,964 | 403,869
Level 1 [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 | 49,154 | 95,872
Level 1 [Member] | Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 365,675 | 229,685
Level 1 [Member] | Restricted cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 95,135 | 78,312
Level 1 [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] | 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 | 9,197 | 38,816
Level 1 [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 | 8,067 | 4,999
Level 1 [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 | 9,989 | 6,927
Level 1 [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 | 6,527 | 25,997
Level 1 [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 | 7,015 | 16,878
Level 1 [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 | 2,935 |
Level 1 [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 | 5,107 | 1,710
Level 1 [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] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value | 4,147 | 3,768
Level 2 [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 | 4,147 | 3,768
Level 2 [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 | 4,008 | 3,627
Level 2 [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 | 38 |
Level 2 [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] | 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 | 101 | 123
Level 3 [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [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] | Cash and cash equivalents [Member] |  |
The assets accounted for at fair value on a recurring basis |  |
Investment Owned, at Fair Value |  |
Level 3 [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] | 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] | 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] | 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] | 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] | 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] | 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] | 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] | 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] | 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] | 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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