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Fair Value Measurements - Level 3 Inputs (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |  |
Percent change in non-performance risk fair value input |  |  | 10.00% |
Transfer from Level 1 to Level 2, commodity contracts assets | $ 0 | $ 0 | $ 0 | $ 0
Transfer from Level 2 to Level 1, commodity contracts assets | 0 | 0 | 0 | 0
Transfer from Level 1 to Level 2, commodity contracts liabilities | 0 | 0 | 0 | 0
Transfer from Level 2 to Level 1, commodity contracts liabilities | 0 | 0 | 0 | 0
Commodity contracts | Revenue |  |  |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |  |
Beginning balance of commodity contracts assets | 500,000 | 500,000 | 3,300,000 | 4,200,000
Realized and Unrealized Gains (Losses) Included in Earnings for commodity contracts assets | 100,000 | (100,000) | (2,300,000) | 700,000
Settlements, commodity contracts assets | 0 | 100,000 | 1,800,000 | 4,600,000
Transfers into Level 3, commodity contracts assets | 0 | 1,000,000 | 1,300,000 | 1,000,000
Ending balance of commodity contracts assets | 600,000 | 1,300,000 | 600,000 | 1,300,000
Change in Unrealized Gains (Losses) Relating to Assets that are Held at end of Period | 200,000 | 1,000,000 | (2,200,000) | 1,400,000
Commodity contracts | Cost of revenue |  |  |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |  |
Beginning balance of commodity contracts liabilities | 300,000 | 400,000 | 200,000 | 1,300,000
Realized and Unrealized Gains (Losses) included in Earnings for commodity contracts liabilities | (100,000) | 400,000 | (200,000) | 800,000
Settlements, commodity contracts liabilities | 0 | 0 | 0 | 500,000
Transfers into Level 3, commodity contracts liabilities | 100,000 | (100,000) | 100,000 | (100,000)
Ending balance of commodity contracts liabilities | 300,000 | 100,000 | 300,000 | 100,000
Change in Unrealized Gains (Losses) Relating to Liabilities that are Held at end of Period | $ 200,000 | $ 500,000 | $ 0 | $ 900,000

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- Definition Fair Value, Unobservable Inputs, Non-Performance Risk, Effect on Income Before Income Taxes, Percentage Change In Input + References No definition available. + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=66048111&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=66048111&loc=d3e19207-110258 + Details
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