Quarterly report pursuant to Section 13 or 15(d)

Oil and Natural Gas Properties (Narrative) (Details)

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Oil and Natural Gas Properties (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
$ / Mcfe
$ / bbl
Write-down of oil and natural gas properties | $ $ 87,301 $ 87,301
Crude Oil [Member]    
Prices used in determining estimated future net cash flows from proved reserves | $ / bbl   54.48
Natural Gas [Member]    
Prices used in determining estimated future net cash flows from proved reserves   3.53