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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
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

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