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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

X

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X

- 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

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