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, 2018	Dec. 31, 2017	Dec. 31, 2016
INCOME TAXES [Abstract]
Income tax expense at the federal statutory tax rate	$ 130,891	$ 126,461	$ 191,540
Statutory depletion	(21,733)	(28,995)	(32,230)
State and local income taxes, net of federal income tax benefit	18,562	8,115	10,074
Share-based compensation	(16,551)	(20,740)	(22,443)
Uncertain tax positions	(6,402)	1,062	1,272
Revaluation - deferred tax balances	0	(301,567)	0
AL NOL valuation allowance release	0	(28,827)	(4,791)
U.S. production deduction	0	2,452	(8,790)
Transition Tax	595	12,301	0
Foreign tax credit carryforward	0	0	(6,513)
Other, net	87	(2,337)	(3,268)
Total income tax expense (benefit)	$ 105,449	$ (232,075)	$ 124,851
Income tax expense at the federal statutory tax rate	21.00%	35.00%	35.00%
Statutory depletion, Rate	(3.50%)	(8.00%)	(5.90%)
State and local income taxes, net of federal income tax benefit, Rate	3.00%	2.20%	1.90%
Share-based compensation, Rate	(2.70%)	(5.70%)	(4.10%)
Undertain tax positions, Rate	1.00%	(0.30%)	(0.20%)
Revaluation - deferred tax balances, rate	0.00%	(83.50%)	0.00%
Al NOL valuation allowance release, Rate	0.00%	(8.00%)	(0.90%)
U.S. production deduction, Rate	(0.00%)	0.70%	(1.60%)
Foreign repatriation, Rate	0.10%	3.40%	0.00%
Foreign tax credit carryforwards, Rate	0.00%	0.00%	(1.20%)
Other, net, Rate	0.00%	(0.60%)	(0.60%)
Effective tax rate	16.90%	(64.20%)	22.80%