ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2019

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligations Operating Costs

in thousands	2019	2018	2017
ARO Operating Costs
Accretion	$        10,992	$        10,776	$       11,415
Depreciation	7,075	6,034	6,302
Total	$        18,067	$        16,810	$       17,717

Reconciliations of Asset Retirement Obligations

in thousands	2019	2018
Asset Retirement Obligations
Balance at beginning of year	$      225,726	$      218,117
Liabilities incurred	263	20
Liabilities settled	(12,457)	(13,558)
Accretion expense	10,992	10,776
Revisions, net	(14,201)	10,371
Balance at end of year	$      210,323	$      225,726