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Derivatives (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Gain (loss) on derivative
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges	$ 0	$ 0	$ 0	$ 0
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge	36,273	(12,032)	34,572	7,593
Realized and Unrealized Gain (Loss) on Hedged Item	(36,227)	10,937	(44,869)	(7,224)
Derivatives not designated as hedging instruments
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	32,310	(2,029)	60,836	25,474
Derivatives not designated as hedging instruments | Commodity contracts | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	19,775	6,589	43,918	26,096
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	760	(521)	9,805	893
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	2,901	(1,992)	1,564	748
Derivatives not designated as hedging instruments | Foreign currency contracts | Other income, net
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	$ 8,874	$ (6,105)	$ 5,549	$ (2,263)

X

- Definition

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

Reference 1: 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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- Definition

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

+ References

Reference 1: 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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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: 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=35706170&loc=SL5618551-113959



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-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=35706170&loc=SL5624171-113959

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- Definition

Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(2)

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

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