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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	$ 516,426	$ 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	85,827	99,640
Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	356,325	229,685
Restricted Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	74,274	78,312
U.S. Government Securities 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	3,913	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	23,546	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	8,962	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	2,517	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	22,437	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	18,172	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	4,090
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	1,989	1,710
Non-hedging derivative (liability) [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)
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	31	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	344	371
Level One [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	512,656	403,869
Level One [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	82,057	95,872
Level One [Member] | Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	356,325	229,685
Level One [Member] | Restricted Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	74,274	78,312
Level One [Member] | U.S. Government Securities 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 One [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	23,546	38,816
Level One [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	8,962	4,999
Level One [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	2,517	6,927
Level One [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	22,437	25,997
Level One [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	18,172	16,878
Level One [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	4,090
Level One [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	1,989	1,710
Level One [Member] | Non-hedging derivative (liability) [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 One [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 One [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	344	371
Level Two [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value	3,770	3,768
Level Two [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	3,770	3,768
Level Two [Member] | Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value
Level Two [Member] | Restricted Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value
Level Two [Member] | U.S. Government Securities 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	3,913	3,627
Level Two [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 Two [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 Two [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 Two [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 Two [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 Two [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 Two [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 Two [Member] | Non-hedging derivative (liability) [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 Two [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	31	123
Level Two [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
Level Three [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value
Level Three [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 Three [Member] | Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value
Level Three [Member] | Restricted Cash and Cash Equivalents [Member]
The assets accounted for at fair value on a recurring basis
Investment Owned, at Fair Value
Level Three [Member] | U.S. Government Securities 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 Three [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 Three [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 Three [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 Three [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 Three [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 Three [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 Three [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 Three [Member] | Non-hedging derivative (liability) [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 Three [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 Three [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

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