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LEASES (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
LEASES (Narrative) (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating Leased Assets [Line Items]
Cash paid for operating leases			$ 25,513,000
Finance leases	$ 0		0
Nonmineral operating lease expense	$ 24,771,000	$ 21,968,000	$ 50,056,000	$ 46,320,000
Minimum [Member] \| Buildings [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			1 year
Term of contract	1 year		1 year
Minimum [Member] \| Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			0 years
Term of contract	2 years		2 years
Minimum [Member] \| Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			0 years
Term of contract	1 year		1 year
Minimum [Member] \| Rail [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			0 years
Term of contract	2 years		2 years
Minimum [Member] \| Barge [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			2 years
Term of contract	10 years		10 years
Minimum [Member] \| Office And Plant Equipment [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			0 years
Term of contract	0 years		0 years
Maximum [Member] \| Buildings [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			30 years
Term of contract	30 years		30 years
Maximum [Member] \| Aggregate Sales Yard [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			13 years
Term of contract	80 years		80 years
Maximum [Member] \| Concrete And Asphalt Site [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			97 years
Term of contract	97 years		97 years
Maximum [Member] \| Rail [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			7 years
Term of contract	76 years		76 years
Maximum [Member] \| Barge [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			3 years
Term of contract	16 years		16 years
Maximum [Member] \| Office And Plant Equipment [Member]
Operating Leased Assets [Line Items]
Noncancellable lease period			4 years
Term of contract	4 years		4 years