Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2013

Asset Retirement Obligation Disclosure [Abstract]

Schedule Of Asset Retirement Obligations

The following table shows certain information about our AROs for the periods indicated:

	Three Months Ended March 31,
	2013			2012
	(In thousands)
ARO liability, January 1:	$	146,159		$	96,446
Accretion of discount	1,521			1,101
Liability incurred	899			1,204
Liability settled	(1,688		)	(1,052		)
Revision of estimates (1)	(11,299		)	(5,050		)
ARO liability, March 31:	135,592			92,649
Less current portion	2,917			2,904
Total long-term ARO	$	132,675		$	89,745

(1) Plugging liability estimates were revised in both March 2013 and March 2012 for updates in the cost of services used to plug wells over the preceding year. Although cost per well increased, a decrease in the inflation factor resulted in a decrease in estimated cost.