Significant Accounting Policies (Details Textuals) (USD $)	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Significant Accounting Policies Details [Abstract]
Gathering facilities impairment charges				$ 92,500,000
Ceiling test limitation				2,900,000,000
Natural Gas Market Price Full Cost Ceiling Test	2.76	2.83	3.15
Crude Oil Market Price Full Cost Ceiling Test	94.71	94.97	95.67
Inventory	1,500,000			1,500,000
Valuation allowance	449,800,000			449,800,000
Natural gas imbalance liability	$ 2,100,000			$ 2,100,000	$ 1,300,000