Decommissioning Liabilities (Tables)

9 Months Ended

Sep. 30, 2012

Decommissioning Liabilities [Abstract]

Summary the activity for company's decommissioning liabilities

	Nine Months Ended
	September 30,
	2012	2011
Decommissioning liabilities, December 31, 2011 and 2010, respectively	$      123,176	$      117,716
Liabilities acquired and incurred	3,573	-
Liabilities settled	(4,624)	-
Accretion	3,260	5,038
Revision in estimated liabilities	(34,373)	(292)
Total decommissioning liabilities, September 30, 2012 and 2011, respectively	91,012	122,462
Less: current portion of decommissioning liabilities at September 30, 2012 and 2011, respectively	-	17,090
Long-term decommissioning liabilities, September 30, 2012 and 2011, respectively	$        91,012	$      105,372