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Fair Value Measurements (Details 3) (Commodity contracts, USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014 Revenue	Sep. 30, 2014 Revenue	Sep. 30, 2013 Cost of revenue	Sep. 30, 2013 Cost of revenue
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Beginning of Period	$ 5,826
Beginning of Period			89
Total Gains (Losses) Included in Earnings	4,053	9,879
Total Gains (Losses) Included in Earnings	(89)	(89)	69	(20)
Settlements	6,620	6,620
Settlements			20	20
End of Period	3,259	3,259
End of Period	89	89
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period	1,950	3,259
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period	$ (89)	$ (89)

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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