SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,322,575	$ 1,327,682	$ 2,371,817	$ 2,324,193
Gross profit		396,519	370,502	598,242	562,177
Depreciation, Depletion, Accretion and Amortization (DDA&A)		99,470	93,497	194,951	182,677
Cash and cash equivalents and restricted cash		817,199	26,522	817,199	26,522	$ 274,506	$ 44,404
Total assets		11,398,724	10,480,764	11,398,724	10,480,764	$ 10,648,793
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,396,118	1,414,995	2,500,924	2,467,638
Total assets		10,454,711	10,286,543	10,454,711	10,286,543
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(73,543)	(87,313)	(129,107)	(143,445)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	997,053	974,748	1,809,715	1,753,581
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[2]	1,070,596	1,062,061	1,938,822	1,897,026
Gross profit		351,162	329,215	545,293	514,931
Depreciation, Depletion, Accretion and Amortization (DDA&A)		80,747	75,760	157,883	148,281
Total assets	[3]	9,545,787	9,385,444	9,545,787	9,385,444
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(73,543)	(87,313)	(129,107)	(143,445)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	222,950	247,163	362,739	379,253
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	222,950	247,163	362,739	379,253
Gross profit		30,464	27,583	28,029	24,311
Depreciation, Depletion, Accretion and Amortization (DDA&A)		8,668	8,884	17,402	17,434
Total assets	[3]	583,902	597,328	583,902	597,328
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]	100,683	103,768	195,448	187,405
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	100,683	103,768	195,448	187,405
Gross profit		14,227	12,887	23,440	21,450
Depreciation, Depletion, Accretion and Amortization (DDA&A)		4,001	3,327	8,083	6,291
Total assets	[3]	321,304	299,729	321,304	299,729
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]	1,889	2,003	3,915	3,954
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,889	2,003	3,915	3,954
Gross profit		666	817	1,480	1,485
Depreciation, Depletion, Accretion and Amortization (DDA&A)		48	58	97	118
Total assets	[3]	3,718	4,042	3,718	4,042
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)		6,006	5,468	11,486	10,553
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 126,814	$ 167,699	$ 126,814	$ 167,699

[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.