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Fair Value Measurements (Details 3) (Commodity contracts, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Revenue
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Total Gains (Losses) Included in Earnings	$ 5,826	$ 5,826
End of Period	5,826	5,826
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period	5,826	5,826
Cost of revenue
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Total Gains (Losses) Included in Earnings	(89)	(89)
End of Period	(89)	(89)
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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-Section 50

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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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Fair value of 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 on the income statement for financial instrument classified as a liability 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 a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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