COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2016

COMMITMENTS AND CONTINGENCIES [Abstract]

Commitments Due

	Unconditional
	Purchase
in thousands	Obligations
Property, Plant & Equipment
2017	$      131,846
Thereafter	200
Total	$      132,046
Noncapital (primarily transportation and electricity contracts)
2017	$        24,402
2018–2019	19,406
2020–2021	7,229
Thereafter	4,000
Total	$        55,037

Minimum Royalties Under Mineral Leases

	Mineral
in thousands	Leases
Minimum Royalties
2017	$        22,153
2018–2019	36,196
2020–2021	23,513
Thereafter	134,379
Total	$      216,241