INCOME TAXES (Sources and Tax Effects of Differences Between Benefit from Income Taxes and Amount Computed by Applying Federal Statutory Income Tax Rate to Earnings from Continuing Operations before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
INCOME TAXES [Abstract]
Income tax expense at the federal statutory tax rate	$ 159,117	$ 130,891	$ 126,461
Statutory depletion	(23,006)	(21,733)	(28,995)
State and local income taxes, net of federal income tax benefit	26,119	18,562	8,115
Share-based compensation	(17,277)	(16,551)	(20,740)
Uncertain tax positions	1,822	(6,402)	1,062
Revaluation - deferred tax balances	0	0	(301,567)
AL NOL valuation allowance release	0	0	(28,827)
Transition tax	0	595	12,301
Research and development credit	(9,490)	0	0
Other, net	(2,087)	87	115
Total income tax expense (benefit)	$ 135,198	$ 105,449	$ (232,075)
Income tax expense at the federal statutory tax rate	21.00%	21.00%	35.00%
Statutory depletion, Rate	(3.00%)	(3.50%)	(8.00%)
State and local income taxes, net of federal income tax benefit, Rate	3.40%	3.00%	2.20%
Share-based compensation, Rate	(2.30%)	(2.70%)	(5.70%)
Uncertain tax positions, Rate	0.20%	(1.00%)	0.30%
Revaluation - deferred tax balances, rate	0.00%	0.00%	(83.50%)
Al NOL valuation allowance release, Rate	0.00%	0.00%	(8.00%)
Transition tax, Rate	0.00%	0.10%	3.40%
Research and development credit, Rate	(1.30%)	(0.00%)	(0.00%)
Other, net, Rate	(0.20%)	0.00%	0.10%
Effective tax rate	17.80%	16.90%	(64.20%)