ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2013

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Six Months Ended
		June 30		June 30
in thousands	2013	2012	2013	2012
ARO Operating Costs
Accretion	$        2,817	$        1,998	$        4,823	$        4,017
Depreciation	830	1,863	1,609	3,727
Total	$        3,647	$        3,861	$        6,432	$        7,744

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Six Months Ended
		June 30		June 30
in thousands	2013	2012	2013	2012
Asset Retirement Obligations
Balance at beginning of period	$     156,458	$     155,402	$     150,072	$     153,979
Liabilities incurred	65,587	45	65,587	45
Liabilities settled	(5,219)	(798)	(6,511)	(1,419)
Accretion expense	2,817	1,998	4,823	4,017
Revisions up (down), net	3,208	(6,234)	8,880	(6,209)
Balance at end of period	$     222,851	$     150,413	$     222,851	$     150,413