ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2014

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

in thousands	2014	2013	2012
ARO Operating Costs
Accretion	$        11,601	$        10,685	$        7,956
Depreciation	4,462	3,527	5,599
Total	$        16,063	$        14,212	$      13,555

Reconciliations of Asset Retirement Obligations

in thousands	2014	2013
Asset Retirement Obligations
Balance at beginning of year	$      228,234	$      150,072
Liabilities incurred	9,130	69,111
Liabilities settled	(26,547)	(16,203)
Accretion expense	11,601	10,685
Revisions up, net	4,147	14,569
Balance at end of year	$      226,565	$      228,234