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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 |  |  |

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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 -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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