COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2014

COMMITMENTS AND CONTINGENCIES [Abstract]

Commitments Due

	Unconditional
	Purchase
in thousands	Obligations
Property, Plant & Equipment
2015	$        34,401
Thereafter	0
Total	$        34,401
Noncapital (primarily transportation and electricity contracts)
2015	$        23,348
2016–2017	4,891
2018–2019	3,880
Thereafter	6,000
Total	$        38,119

Minimum Royalties Under Mineral Leases

	Mineral
in thousands	Leases
Minimum Royalties
2015	$        19,274
2016–2017	26,954
2018–2019	19,050
Thereafter	124,846
Total	$      190,124

Summary of Standby Letters of Credit

in thousands
Standby Letters of Credit
Risk management insurance	$       33,199
Industrial revenue bond	14,230
Reclamation/restoration requirements	6,121
Total	$       53,550