SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,309,890	$ 1,418,758	$ 3,681,707	$ 3,742,951
Gross profit		380,498	400,643	978,740	962,820
Depreciation, Depletion, Accretion and Amortization (DDA&A)		100,962	96,247	295,912	278,925
Cash and cash equivalents and restricted cash		1,084,730	91,102	1,084,730	91,102	$ 274,506	$ 44,404
Total assets		11,590,533	10,539,673	11,590,533	10,539,673	$ 10,648,793
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,388,324	1,518,405	3,889,248	3,986,043
Total assets		10,375,417	10,310,394	10,375,417	10,310,394
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(78,434)	(99,647)	(207,541)	(243,092)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	970,528	1,033,438	2,780,243	2,787,019
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[2]	1,048,962	1,133,085	2,987,784	3,030,111
Gross profit		337,891	357,202	883,184	872,133
Depreciation, Depletion, Accretion and Amortization (DDA&A)		82,487	78,978	240,370	227,259
Total assets	[3]	9,497,041	9,403,342	9,497,041	9,403,342
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(78,434)	(99,647)	(207,541)	(243,092)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	235,201	270,237	597,940	649,490
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	235,201	270,237	597,940	649,490
Gross profit		30,217	27,639	58,246	51,950
Depreciation, Depletion, Accretion and Amortization (DDA&A)		8,644	8,909	26,046	26,343
Total assets	[3]	559,416	601,059	559,416	601,059
Asphalt [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0	0	0	0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	102,807	112,964	298,255	300,369
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	102,807	112,964	298,255	300,369
Gross profit		12,157	15,037	35,597	36,487
Depreciation, Depletion, Accretion and Amortization (DDA&A)		3,987	3,371	12,070	9,662
Total assets	[3]	315,349	302,003	315,349	302,003
Concrete [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0	0	0	0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,354	2,119	5,269	6,073
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,354	2,119	5,269	6,073
Gross profit		233	765	1,713	2,250
Depreciation, Depletion, Accretion and Amortization (DDA&A)		49	59	146	177
Total assets	[3]	3,611	3,990	3,611	3,990
Calcium [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	0	0	0	0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion, Accretion and Amortization (DDA&A)		5,795	4,930	17,280	15,484
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 130,386	$ 138,177	$ 130,386	$ 138,177

[1] ¹ The geographic markets are defined by states/countries as follows: East market — Arkansas, Delaware, Illinois, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, Virginia, and Washington D.C. Gulf Coast market — Alabama, Florida, Georgia, Louisiana, Mexico, Mississippi, Oklahoma, South Carolina and Texas West market — Arizona, California and New Mexico

[2] Includes product sales (crushed stone, sand and gravel, sand, and other aggregates), as well as freight & delivery costs that we pass along to our customers, and service revenues (see Note 4) related to aggregates.

[3] Certain temporarily idled assets are included within a segment's Identifiable Assets but the associated DDA&A is shown within Other in the DDA&A section above as the related DDA&A is excluded from segment gross profit.

[4] Includes product sales, as well as service revenues (see Note 4) from our asphalt construction paving business.