ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2012

ARO Operating Costs

For the years ended December 31, we recognized ARO operating costs related to accretion of the liabilities and depreciation of the assets as follows:

in thousands	2012		2011		2010
ARO Operating Costs
Accretion		$7,956		$8,195		$8,641
Depreciation		5,599		7,242		11,516
Total		$13,555		$15,437		$20,157

Reconciliations of Asset Retirement Obligations

Reconciliations of the carrying amounts of our asset retirement obligations for the years ended December 31 are as follows:

in thousands	2012			2011
Asset Retirement Obligations
Balance at beginning of year		$153,979			$162,730
Liabilities incurred		127			1,738
Liabilities settled		(2,993	)		(16,630	)
Accretion expense		7,956			8,195
Revisions up (down), net		(8,997	)		(2,054	)
Balance at end of year		$150,072			$153,979