ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2015

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Six Months Ended
	June 30			June 30
in thousands	2015	2014		2015	2014
ARO Operating Costs
Accretion	$        2,936	$        2,913		$        5,787	$        5,852
Depreciation	1,568	983		3,001	1,980
Total	$        4,504	$        3,896		$        8,788	$        7,832

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Six Months Ended
	June 30			June 30
in thousands	2015	2014		2015	2014
Asset Retirement Obligations
Balance at beginning of period	$     238,689	$     225,831		$     226,565	$     228,234
Liabilities incurred	4,339	0		6,159	0
Liabilities settled	(1,270)	(7,593)		(8,000)	(12,843)
Accretion expense	2,936	2,913		5,787	5,852
Revisions up (down), net	(9,775)	3,966		4,408	3,874
Balance at end of period	$     234,919	$     225,117		$     234,919	$     225,117