ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2012

ARO Operating Costs

For the three and nine month periods ended September 30, we recognized ARO operating costs related to accretion of the liabilities and depreciation of the assets as follows:

	Three Months Ended September 30				Nine Months Ended September 30
in thousands	2012		2011		2012		2011
ARO Operating Costs
Accretion	$	1,973	$	1,894	$	5,990	$	6,189
Depreciation		1,110		1,947		4,837		5,342
Total	$	3,083	$	3,841	$	10,827	$	11,531

Reconciliations of ARO

Reconciliations of the carrying amounts of our AROs are as follows:

	Three Months Ended September 30						Nine Months Ended September 30
in thousands	2012			2011			2012			2011
Asset Retirement Obligations
Balance at beginning of period		$150,413			$160,733			$153,979			$162,730
Liabilities incurred		82			1,456			127			1,734
Liabilities settled		(822	)		(6,238	)		(2,241	)		(12,202	)
Accretion expense		1,973			1,894			5,990			6,189
Revisions up (down), net		(2,923	)		139			(9,132	)		(467	)
Balance at end of period		$148,723			$157,984			$148,723			$157,984