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LEASES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
LEASES (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Leased Assets [Line Items]
Cash paid for operating leases			$ 39,326
Finance leases	$ 0		0
Nonmineral operating lease expense	$ 25,676	$ 22,539	$ 75,732	$ 68,859
Minimum [Member] \| Buildings [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			1 year
Term of contract	1 year		1 year
Minimum [Member] \| Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			0 years
Term of contract	2 years		2 years
Minimum [Member] \| Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			0 years
Term of contract	1 year		1 year
Minimum [Member] \| Rail [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			0 years
Term of contract	2 years		2 years
Minimum [Member] \| Barge [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			2 years
Term of contract	10 years		10 years
Minimum [Member] \| Office And Plant Equipment [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			0 years
Term of contract	0 years		0 years
Minimum [Member] \| Office And Plant Equipment, Short-term Lease [Member]
Operating Leased Assets [Line Items]
Term of contract	1 year		1 year
Maximum [Member] \| Buildings [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			9 years
Term of contract	28 years		28 years
Maximum [Member] \| Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			30 years
Term of contract	80 years		80 years
Maximum [Member] \| Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			97 years
Term of contract	97 years		97 years
Maximum [Member] \| Rail [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			7 years
Term of contract	76 years		76 years
Maximum [Member] \| Barge [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			3 years
Term of contract	16 years		16 years
Maximum [Member] \| Office And Plant Equipment [Member]
Operating Leased Assets [Line Items]
Noncancelable lease period			4 years
Term of contract	4 years		4 years
Maximum [Member] \| Equipment [Member]
Operating Leased Assets [Line Items]
Term of contract	1 year		1 year