INCOME TAXES (Sources and Tax Effects of Differences Between Benefit from Income Taxes and Amount Computed by Applying Federal Statutory Income Tax Rate to Losses from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INCOME TAXES [Abstract]
Income tax expense at the federal statutory tax rate of 35%		$ 126,461	$ 191,540	$ 114,750
Statutory depletion		(28,995)	(32,230)	(27,702)
State and local income taxes, net of federal income tax benefit		8,115	10,074	10,600
U.S. production deduction		2,452	(8,790)	(5,099)
Foreign tax credit carryforward		0	(6,513)	6,486
Share-based compensation	[1]	(20,740)	(22,443)	0
Permanently reinvested foreign earnings		(2,211)	(4,578)	(6,396)
Foreign repatriation		12,301	0	0
Revaluation - deferred tax balances		(301,567)	0	0
Al NOL valuation allowance release		(28,827)	(4,791)	(4,655)
Other, net		936	2,582	6,959
Total income tax expense (benefit)		$ (232,075)	$ 124,851	$ 94,943
Income tax expense at the federal statutory tax rate of 35%, Rate		35.00%	35.00%	35.00%
Statutory depletion, Rate		(8.00%)	(5.90%)	(8.40%)
State and local income taxes, net of federal income tax benefit, Rate		2.20%	1.90%	3.20%
U.S. production deduction, Rate		0.70%	(1.60%)	(1.60%)
Foreign tax credit carryforwards impairment, Rate		0.00%	(1.20%)	2.00%
Share-based compensation, Rate	[1]	(5.70%)	(4.10%)	(0.00%)
Permanently reinvested foreign earnings, Rate		(0.60%)	(0.80%)	(2.00%)
Foreign repatriation, Rate		3.40%	0.00%	0.00%
Revaluation - deferred tax balances, rate		(83.50%)	0.00%	0.00%
Al NOL valuation allowance release, Rate		(8.00%)	(0.90%)	(1.40%)
Other, net, Rate		0.30%	0.40%	2.20%
Effective tax rate		(64.20%)	22.80%	29.00%

[1] As discussed in Note 1 (under the caption Share-based Compensation), we early adopted ASU 2016-09 as of December 31, 2016.