ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2015

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Nine Months Ended
	September 30			September 30
in thousands	2015	2014		2015	2014
ARO Operating Costs
Accretion	$        2,766	$        2,892		$        8,553	$        8,745
Depreciation	1,681	1,080		4,683	3,060
Total	$        4,447	$        3,972		$      13,236	$      11,805

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Nine Months Ended
	September 30			September 30
in thousands	2015	2014		2015	2014
Asset Retirement Obligations
Balance at beginning of period	$     234,919	$     225,117		$     226,565	$     228,234
Liabilities incurred	0	3,604		6,159	3,604
Liabilities settled	(5,318)	(7,684)		(13,318)	(20,527)
Accretion expense	2,766	2,892		8,553	8,745
Revisions up, net	2,313	4,539		6,721	8,412
Balance at end of period	$     234,680	$     228,468		$     234,680	$     228,468