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Derivatives (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivatives instruments designated as hedging instruments | Fair value hedges
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge	$ 36,522	$ 11,814	$ 9,041	$ (25,219)
Derivatives instruments designated as hedging instruments | Fair value hedges | Hedged items
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedged Item	(32,847)	(8,127)	(2,881)	35,818
Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue | Hedged item commitments
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedged Item		(5,356)	(201)	(16,789)
Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue | Hedged item commitments
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedged Item		274	739	8,311
Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue | Hedged item inventories
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedged Item	(32,847)	(3,045)	(3,419)	44,296
Derivatives instruments not designated as hedging instruments
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	7,802	3,087	11,386	3,399
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge		5,518	265	16,205
Commodity contracts | Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge		(369)	(1,417)	(7,830)
Commodity contracts | Derivatives instruments not designated as hedging instruments | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	(16,549)	1,490	(16,772)	3,048
Commodity contracts | Derivatives instruments not designated as hedging instruments | Cost of revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	22,549	2,560	29,570	3,223
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	824		(728)
Foreign currency contracts | Derivatives instruments not designated as hedging instruments | Other income (expense), net
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	978	(963)	(684)	(2,872)
Commodity contracts. | Derivatives instruments designated as hedging instruments | Fair value hedges | Cost of revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge	$ 36,522	$ 6,665	$ 10,193	$ (33,594)

X

- Definition

The amount recognized in earnings related to the change in fair value during the period of derivative or nonderivative instruments designated as fair value hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

The amount recognized in earnings related to the change in fair value during the period of the hedged item in a fair value hedge.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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X

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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