LEASES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Leased Assets [Line Items]
Cash paid for operating leases	$ 52,660
Nonmineral operating lease expense	102,664	$ 131,015	$ 110,358
Variable lease cost	$ 13,739
Minimum [Member] | Buildings [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	0 years
Minimum [Member] | Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	0 years
Minimum [Member] | Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	0 years
Minimum [Member] | Rail [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	1 year
Minimum [Member] | Barge [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	1 year
Term of contract	9 years
Minimum [Member] | Office And Plant Equipment [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	0 years
Minimum [Member] | Office And Plant Equipment, Short-term Lease [Member]
Operating Leased Assets [Line Items]
Term of contract	1 year
Maximum [Member] | Buildings [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	8 years
Term of contract	27 years
Maximum [Member] | Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	29 years
Term of contract	79 years
Maximum [Member] | Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	20 years
Term of contract	79 years
Maximum [Member] | Rail [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	4 years
Term of contract	65 years
Maximum [Member] | Barge [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	2 years
Term of contract	15 years
Maximum [Member] | Office And Plant Equipment [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	5 years
Term of contract	5 years
Maximum [Member] | Equipment [Member]
Operating Leased Assets [Line Items]
Term of contract	1 year