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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
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

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

+ Details

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