ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2021

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Six Months Ended
	June 30		June 30
in thousands	2021	2020	2021	2020
ARO Operating Costs
Accretion	$        3,259	$        3,247	$        6,455	$        6,155
Depreciation	2,664	2,063	5,325	3,899
Total	$        5,923	$        5,310	$      11,780	$      10,054

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Six Months Ended
	June 30		June 30
in thousands	2021	2020	2021	2020
Asset Retirement Obligations
Balance at beginning of period	$     285,401	$     263,445	$     283,163	$     210,323
Liabilities incurred	0	0	938	0
Liabilities settled	(2,260)	(3,354)	(4,953)	(8,588)
Accretion expense	3,259	3,247	6,455	6,155
Revisions, net	35	410	832	55,858
Balance at end of period	$     286,435	$     263,748	$     286,435	$     263,748