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Oil and natural gas properties disposition (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014
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Property, Plant and Equipment Impairment or Disposal [Abstract] |
Sale of oil and natural gas properties | $ 184.4

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentImpairmentOrDisposalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant