COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2020

COMMITMENTS AND CONTINGENCIES [Abstract]

Commitments Due

	Unconditional
	Purchase
in thousands	Obligations
Property, Plant & Equipment
2021	$          6,947
Thereafter	0
Total	$          6,947
Noncapital (primarily transportation and electricity contracts)
2021	$        16,005
2022–2023	15,106
2024–2025	4,054
Thereafter	11,000
Total	$        46,165

Minimum Royalties Under Mineral Leases

	Mineral
in thousands	Leases
Minimum Royalties
2021	$        27,210
2022–2023	43,491
2024–2025	27,712
Thereafter	167,147
Total	$      265,560