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Prepaid Drilling Expense	9 Months Ended
Prepaid Drilling Expense	Sep. 30, 2011
Prepaid Drilling Expense [Abstract]
Prepaid Drilling Expense	5. Prepaid Drilling Expense Prepaid drilling expense at September 30, 2011 includes the amount paid related to a non-operated well expected to be completed in the fourth quarter of 2011.