ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2014

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Nine Months Ended
	September 30		September 30
in thousands	2014	2013	2014	2013
ARO Operating Costs
Accretion	$        2,892	$        2,908	$        8,745	$        7,731
Depreciation	1,080	886	3,060	2,495
Total	$        3,972	$        3,794	$      11,805	$      10,226

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Nine Months Ended
	September 30		September 30
in thousands	2014	2013	2014	2013
Asset Retirement Obligations
Balance at beginning of period	$     225,117	$     222,851	$     228,234	$     150,072
Liabilities incurred	3,604	3,524	3,604	69,111
Liabilities settled	(7,684)	(2,328)	(20,527)	(8,839)
Accretion expense	2,892	2,908	8,745	7,731
Revisions up (down), net	4,539	6,606	8,412	15,486
Balance at end of period	$     228,468	$     233,561	$     228,468	$     233,561