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Fair Value Measurements - Significant Unobservable Inputs - Derivative Contracts (Details) - Fair Value Measurements Level 3 - Natural Gas Basis Swaps $ in Thousands | Sep. 30, 2015 USD ($) $ / Mcf | Dec. 31, 2014 USD ($) $ / Mcf
--- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Fair value | $ | $ (3,436) | $ 350
Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Derivative, forward price (usd/mcf) | (0.11) | (0.03)
Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Derivative, forward price (usd/mcf) | (0.31) | (0.38)
Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation |  |
Derivative, forward price (usd/mcf) | (0.20) | (0.29)

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- Definition 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. + 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) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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