LEASES (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Leased Assets [Line Items]
Cash paid for operating leases	$ 54,871	$ 52,660
Cash paid for finance leases	102	$ 4
Finance leases	$ 6,186
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	1 year
Minimum [Member] | Rail [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	2 years
Minimum [Member] | Barge [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	0 years
Term of contract	0 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	7 years
Term of contract	26 years
Maximum [Member] | Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	28 years
Term of contract	78 years
Maximum [Member] | Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	19 years
Term of contract	78 years
Maximum [Member] | Rail [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	4 years
Term of contract	64 years
Maximum [Member] | Barge [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period	1 year
Term of contract	14 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