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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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