SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,361,047	$ 1,322,575	$ 2,429,391	$ 2,371,817
Gross profit		398,364	396,519	627,631	598,242
Depreciation, Depletion, Accretion & Amortization (DDA&A)		103,107	99,470	203,475	194,951
Cash and cash equivalents and restricted cash		968,406	817,199	968,406	817,199	$ 1,198,013	$ 274,506
Total assets		11,571,027	11,398,724	11,571,027	11,398,724	$ 11,686,905
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,436,105	1,396,118	2,561,600	2,500,924
Total assets	[2]	10,389,757	10,454,711	10,389,757	10,454,711
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(75,058)	(73,543)	(132,209)	(129,107)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,050,309	997,053	1,888,067	1,809,715
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[3]	1,125,367	1,070,596	2,020,276	1,938,822
Gross profit		373,833	351,162	597,471	545,293
Depreciation, Depletion, Accretion & Amortization (DDA&A)		84,328	80,747	165,136	157,883
Total assets	[2]	9,492,913	9,545,787	9,492,913	9,545,787
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(75,058)	(73,543)	(132,209)	(129,107)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	212,577	222,950	359,744	362,739
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	212,577	222,950	359,744	362,739
Gross profit		13,532	30,464	10,541	28,029
Depreciation, Depletion, Accretion & Amortization (DDA&A)		9,060	8,668	18,155	17,402
Total assets	[2]	579,151	583,902	579,151	583,902
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]	96,201	100,683	177,560	195,448
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	96,201	100,683	177,560	195,448
Gross profit		10,293	14,227	18,061	23,440
Depreciation, Depletion, Accretion & Amortization (DDA&A)		4,026	4,001	7,978	8,083
Total assets	[2]	314,166	321,304	314,166	321,304
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]	1,960	1,889	4,020	3,915
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,960	1,889	4,020	3,915
Gross profit		706	666	1,558	1,480
Depreciation, Depletion, Accretion & Amortization (DDA&A)		39	48	78	97
Total assets	[2]	3,527	3,718	3,527	3,718
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 & Amortization (DDA&A)		5,654	6,006	12,128	11,486
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 212,864	$ 126,814	$ 212,864	$ 126,814

[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] 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.

[3] 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.

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