Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2012

Asset Retirement Obligation Disclosure [Abstract]

Schedule Of Asset Retirement Obligations

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

	Six Months Ended June 30,
	2012				2011
	(In thousands)
ARO liability, January 1:	$	96,446			$	69,265
Accretion of discount	2,126				1,735
Liability incurred	4,420				2,879
Liability settled	(1,447		)		(666		)
Revision of estimates	(5,022		)	(1)	9
ARO liability, June 30:	96,523				73,222
Less current portion	2,909				1,781
Total long-term ARO	$	93,614			$	71,441

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