SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

6 Months Ended

Jun. 30, 2021

SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]

Supplemental Information Referable to Condensed Consolidated Statements of Cash Flows

	Six Months Ended
	June 30
in thousands	2021	2020
Cash Payments
Interest (exclusive of amount capitalized)	$       65,195	$       60,741
Income taxes	87,416	9,055
Noncash Investing and Financing Activities
Accrued liabilities for purchases of property, plant & equipment	$       27,018	$       10,994
Recognition of new and revised asset retirement obligations	1,770	55,858
Recognition of new and revised right-of-use assets for
Operating lease liabilities 1	56,974	25,083
Finance lease liabilities	3,265	4,991
Amounts referable to business acquisitions
Liabilities assumed	0	5,637
Consideration payable to seller	0	8,980
Fair value of noncash assets and liabilities exchanged	0	21,214

¹ The 2021 amount includes a modification to our headquarters office space lease to extend the lease term.