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Fair Value Measurements - Significant Unobservable Inputs - Derivative Contracts (Details) - Fair Value Measurements Level 3 - Natural Gas Basis Swaps $ in Thousands	Jun. 30, 2015 USD ($) $ / Mcf	Dec. 31, 2014 USD ($) $ / Mcf
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Derivative, weighted average forward price (usd/mcf)	(0.27)	(0.29)
Fair value, level 3 commodity derivative contracts | $	$ (2,207)	$ 350
Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Derivative, forward price (usd/mcf)	(0.12)	(0.03)
Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Derivative, forward price (usd/mcf)	(0.45)	(0.38)

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- Definition

Derivative, Weighted Average Forward Price

+ References

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- Definition

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- Definition

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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

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