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The revenues derived from sales of oil or gas in each geographic area during the reporting period divided by the number of barrels of oil produced or thousands of cubic feet of gas produced.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 3

-Subparagraph A

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- Definition

The gain recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Topic 932

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Ceiling Test Write-down (Details) (USD $)	12 Months Ended
Ceiling Test Write-down (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Ceiling Test (Textual) [Abstract]
Ceiling test write-down	$ 0us-gaap_ImpairmentOfOilAndGasProperties	$ 0us-gaap_ImpairmentOfOilAndGasProperties	$ 137,100,000us-gaap_ImpairmentOfOilAndGasProperties
Decrease in ceiling test write-down			$ (2,200,000)
Mcf of natural gas
Ceiling Test (Textual) [Abstract]
Average sales prices			2.21
Barrel of oil
Ceiling Test (Textual) [Abstract]
Average sales prices			102.81
Mcfe of Ngl
Ceiling Test (Textual) [Abstract]
Average sales prices			6.07