Quarterly report pursuant to Section 13 or 15(d)

Impairment of Proved Properties (Details)

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Impairment of Proved Properties (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2012
Supplemental Income Statement Elements (Textual) [Abstract]  
Company recognized an impairment loss $ 7.6
Estimated fair value $ 7.7