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Data Type:	num:percentItemType
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Percentage of the Fair Value of Commodity Derivatives Liabilities measured using significantly unobservable inputs (Level 3).

No definition available.

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Data Type:	num:percentItemType
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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

No definition available.

Name:	us-gaap_DerivativeCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

No definition available.

Name:	us-gaap_DerivativeFloorPrice
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DerivativeLineItems
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Nominal energy measure used to calculate payments on a derivative instrument.

No definition available.

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
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Data Type:	num:energyItemType
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Nominal volume used to calculate payments on a derivative instrument.

No definition available.

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
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Data Type:	num:volumeItemType
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Average fixed price related to the group of price risk swap derivatives.

No definition available.

Name:	us-gaap_DerivativeSwapTypeAverageFixedPrice
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Data Type:	srt-types:perUnitItemType
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Name:	us-gaap_DerivativeInstrumentRiskAxis=exch_NYMS
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