ASSET RETIREMENT OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2015

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended
	March 31
in thousands	2015	2014
ARO Operating Costs
Accretion	$        2,851	$        2,940
Depreciation	1,433	997
Total	$        4,284	$        3,937

Reconciliations of Asset Retirement Obligations

	Three Months Ended
	March 31
in thousands	2015	2014
Asset Retirement Obligations
Balance at beginning of year	$     226,565	$     228,234
Liabilities incurred	1,820	0
Liabilities settled	(6,730)	(5,250)
Accretion expense	2,851	2,940
Revisions up (down), net	14,183	(93)
Balance at end of period	$     238,689	$     225,831