ASSET RETIREMENT OBLIGATIONS (Tables)

9 Months Ended

Sep. 30, 2019

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Nine Months Ended
	September 30		September 30
in thousands	2019	2018	2019	2018
ARO Operating Costs
Accretion	$        2,744	$        2,684	$        8,194	$        8,036
Depreciation	1,720	1,512	5,361	4,192
Total	$        4,464	$        4,196	$      13,555	$      12,228

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Nine Months Ended
	September 30		September 30
in thousands	2019	2018	2019	2018
Asset Retirement Obligations
Balance at beginning of period	$     223,497	$     215,421	$     225,726	$     218,117
Liabilities incurred	0	0	263	0
Liabilities settled	(2,684)	(2,649)	(9,650)	(10,476)
Accretion expense	2,744	2,684	8,194	8,036
Revisions, net	510	10,628	(466)	10,407
Balance at end of period	$     224,067	$     226,084	$     224,067	$     226,084