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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Commodity contracts Cost of revenue	Dec. 31, 2012 Earn-out Other (expense) income, net	Dec. 31, 2012 Commodity contracts Revenue
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs
Total Gains (Losses) Included in Earnings				$ 1,271
Settlements				1,271
Beginning of Period			4,194
Total Gains (Losses) Included in Earnings		(20)	(110)
Settlements		20	4,304
Fair value of asset (liability) transfers between Level 1, 2 or 3	0
Level 3 purchases, sales or issuances of assets (liabilities)	$ 0

X

- Definition

Amount of inter level transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of settlement 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.

+ References

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Amount of settlements 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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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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