ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2020

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

	Three Months Ended		Six Months Ended
	June 30		June 30
in thousands	2020	2019	2020	2019
ARO Operating Costs
Accretion	$        3,247	$        2,717	$        6,155	$        5,450
Depreciation	2,063	1,800	3,899	3,641
Total	$        5,310	$        4,517	$      10,054	$        9,091

Reconciliations of Asset Retirement Obligations

	Three Months Ended		Six Months Ended
	June 30		June 30
in thousands	2020	2019	2020	2019
Asset Retirement Obligations
Balance at beginning of period	$     263,445	$     225,186	$     210,323	$     225,726
Liabilities incurred	0	263	0	263
Liabilities settled	(3,354)	(3,388)	(8,588)	(6,966)
Accretion expense	3,247	2,717	6,155	5,450
Revisions, net	410	(1,281)	55,858	(976)
Balance at end of period	$     263,748	$     223,497	$     263,748	$     223,497