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Fair Value Measurements (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Fair value measured on recurring basis | Level 1
Assets:
Total assets	$ 28,889,000	$ 785,000
Liabilities:
Total liabilities	30,144,000	2,226,000
Fair value measured on recurring basis | Level 1 | Cash equivalents
Assets:
Total assets		32,000
Fair value measured on recurring basis | Level 1 | Commodity contracts
Assets:
Total assets	28,889,000	753,000
Liabilities:
Total liabilities	30,144,000	2,226,000
Fair value measured on recurring basis | Level 2
Assets:
Total assets	85,404,000	17,915,000
Liabilities:
Total liabilities	72,975,000	15,861,000
Fair value measured on recurring basis | Level 2 | Commodity contracts
Assets:
Total assets	81,682,000	14,139,000
Liabilities:
Total liabilities	70,796,000	14,926,000
Fair value measured on recurring basis | Level 2 | Foreign currency contracts
Assets:
Total assets	4,096,000	461,000
Liabilities:
Total liabilities	1,191,000	574,000
Fair value measured on recurring basis | Level 2 | Hedged item inventories
Assets:
Total assets	(3,864,000)	2,518,000
Liabilities:
Total liabilities		361,000
Fair value measured on recurring basis | Level 2 | Hedged item commitments
Assets:
Total assets	3,490,000	797,000
Liabilities:
Total liabilities	988,000
Fair value measured on recurring basis | Level 3
Assets:
Total assets		123,000
Liabilities:
Total liabilities	5,007,000	5,045,000
Fair value measured on recurring basis | Level 3 | Commodity contracts
Assets:
Total assets		123,000
Liabilities:
Total liabilities		33,000
Fair value measured on recurring basis | Level 3 | Earn-out
Liabilities:
Total liabilities	5,007,000	5,012,000
Fair value measured on recurring basis | Sub-Total
Assets:
Total assets	114,293,000	18,823,000
Liabilities:
Total liabilities	108,126,000	23,132,000
Fair value measured on recurring basis | Sub-Total | Cash equivalents
Assets:
Total assets		32,000
Fair value measured on recurring basis | Sub-Total | Commodity contracts
Assets:
Total assets	110,571,000	15,015,000
Liabilities:
Total liabilities	100,940,000	17,185,000
Fair value measured on recurring basis | Sub-Total | Foreign currency contracts
Assets:
Total assets	4,096,000	461,000
Liabilities:
Total liabilities	1,191,000	574,000
Fair value measured on recurring basis | Sub-Total | Hedged item inventories
Assets:
Total assets	(3,864,000)	2,518,000
Liabilities:
Total liabilities		361,000
Fair value measured on recurring basis | Sub-Total | Hedged item commitments
Assets:
Total assets	3,490,000	797,000
Liabilities:
Total liabilities	988,000
Fair value measured on recurring basis | Sub-Total | Earn-out
Liabilities:
Total liabilities	5,007,000	5,012,000
Fair value measured on recurring basis | Netting and Collateral
Assets:
Total assets	(91,118,000)	(7,542,000)
Liabilities:
Total liabilities	(96,288,000)	(8,933,000)
Fair value measured on recurring basis | Netting and Collateral | Commodity contracts
Assets:
Total assets	(89,894,000)	(7,000,000)
Liabilities:
Total liabilities	(95,064,000)	(8,391,000)
Fair value measured on recurring basis | Netting and Collateral | Foreign currency contracts
Assets:
Total assets	(920,000)	(277,000)
Liabilities:
Total liabilities	(920,000)	(277,000)
Fair value measured on recurring basis | Netting and Collateral | Hedged item inventories
Liabilities:
Total liabilities		(265,000)
Fair value measured on recurring basis | Netting and Collateral | Hedged item commitments
Assets:
Total assets	(304,000)	(265,000)
Liabilities:
Total liabilities	(304,000)
Fair value measured on recurring basis | Total
Assets:
Total assets	23,175,000	11,281,000
Liabilities:
Total liabilities	11,838,000	14,199,000
Fair value measured on recurring basis | Total | Cash equivalents
Assets:
Total assets		32,000
Fair value measured on recurring basis | Total | Commodity contracts
Assets:
Total assets	20,677,000	8,015,000
Liabilities:
Total liabilities	5,876,000	8,794,000
Fair value measured on recurring basis | Total | Foreign currency contracts
Assets:
Total assets	3,176,000	184,000
Liabilities:
Total liabilities	271,000	297,000
Fair value measured on recurring basis | Total | Hedged item inventories
Assets:
Total assets	(3,864,000)	2,518,000
Liabilities:
Total liabilities		96,000
Fair value measured on recurring basis | Total | Hedged item commitments
Assets:
Total assets	3,186,000	532,000
Liabilities:
Total liabilities	684,000
Fair value measured on recurring basis | Total | Earn-out
Liabilities:
Total liabilities	5,007,000	5,012,000
Netting and Collateral
Fair value measurement, additional disclosure
Amount recognized for the obligation to return cash collateral	1,000,000
Amount recognized for the right to reclaim cash collateral	$ 6,100,000

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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The amount of the obligation to return cash collateral under master netting arrangements that have not been offset against net derivative instrument positions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41678-113959

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41678-113959

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