ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2013

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Nine Months Ended
		September 30		September 30
in thousands	2013	2012	2013	2012
ARO Operating Costs
Accretion	$        2,908	$        1,973	$        7,731	$        5,990
Depreciation	886	1,110	2,495	4,837
Total	$        3,794	$        3,083	$      10,226	$      10,827

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Nine Months Ended
		September 30		September 30
in thousands	2013	2012	2013	2012
Asset Retirement Obligations
Balance at beginning of period	$     222,851	$     150,413	$     150,072	$     153,979
Liabilities incurred	3,524	82	69,111	127
Liabilities settled	(2,328)	(822)	(8,839)	(2,241)
Accretion expense	2,908	1,973	7,731	5,990
Revisions up (down), net	6,606	(2,923)	15,486	(9,132)
Balance at end of period	$     233,561	$     148,723	$     233,561	$     148,723