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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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