ASSET RETIREMENT OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2020

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended
	March 31
in thousands	2020	2019
ARO Operating Costs
Accretion	$        2,908	$        2,733
Depreciation	1,836	1,841
Total	$        4,744	$        4,574

Reconciliations of Asset Retirement Obligations

	Three Months Ended
	March 31
in thousands	2020	2019
Asset Retirement Obligations
Balance at beginning of year	$     210,323	$     225,726
Liabilities incurred	0	0
Liabilities settled	(5,234)	(3,578)
Accretion expense	2,908	2,733
Revisions, net	55,448	305
Balance at end of period	$     263,445	$     225,186