Asset Retirement Obligations

9 Months Ended

Sep. 30, 2011

Asset Retirement Obligations [Abstract]

ASSET RETIREMENT OBLIGATIONS

7. ASSET RETIREMENT OBLIGATIONS

A summary of the changes in asset retirement obligations is included in the table below (unaudited, dollars in thousands):

Balance, December 31, 2010	$	42,713
Liabilities incurred		445
Liabilities assumed with acquired producing properties		2,807
Liabilities settled		(702	)
Accretion expense		1,430
Balance, September 30, 2011		46,693
Less: Current portion		3,418
	$	43,275