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Derivatives (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gain (loss) on derivative
Gains or losses that were excluded from the assessment of the effectiveness of fair value hedges	$ 0	$ 0	$ 0	$ 0
Cash flow hedges.
Gain (loss) on derivative
Amount of Loss Recognized in Accumulated Other Comprehensive Income (Effective Portion)	(1,100)		(1,100)
Amount of Loss Recognized in Income (Ineffective Portion)	(300)		(300)
Cash flow hedges. | Commodity contracts | Revenue
Gain (loss) on derivative
Amount of Gain Recognized in Accumulated Other Comprehensive Income (Effective Portion)	300		300
Amount of Loss Recognized in Income (Ineffective Portion)	(1,200)		(1,200)
Cash flow hedges. | Commodity contracts | Cost of revenue.
Gain (loss) on derivative
Amount of Loss Recognized in Accumulated Other Comprehensive Income (Effective Portion)	(1,400)		(1,400)
Amount of Gain Recognized in Income (Ineffective Portion)	900		900
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | Cost of revenue.
Gain (loss) on derivative
Realized and Unrealized Gain (Loss) on Hedge	52,800	36,300	36,700	34,600
Realized and Unrealized Gain (Loss) on Hedged Item	(48,500)	(36,200)	(29,200)	(44,900)
Derivatives not designated as hedging instruments
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	8,600	32,300	30,200	60,800
Derivatives not designated as hedging instruments | Commodity contracts | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	43,200	19,800	89,200	43,900
Derivatives not designated as hedging instruments | Commodity contracts | Cost of revenue.
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	(39,900)	700	(68,000)	9,800
Derivatives not designated as hedging instruments | Foreign currency contracts | Revenue
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	3,400	2,900	2,100	1,600
Derivatives not designated as hedging instruments | Foreign currency contracts | Other income (expense), net
Gain (loss) on derivative
Realized and Unrealized Gain (Loss)	$ 1,900	$ 8,900	$ 6,900	$ 5,500

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.

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

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