SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	[1]	$ 1,327,682	$ 1,200,151	$ 2,324,193	$ 2,054,625
Gross profit		370,502	323,184	562,177	482,519
Depreciation, Depletion, Accretion and Amortization (DDA&A)		93,497	85,633	182,677	167,072
Cash and cash equivalents and restricted cash		26,522	61,115	26,522	61,115	$ 44,404	$ 146,646
Total assets		10,480,764	9,844,784	10,480,764	9,844,784	$ 9,832,130
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	1,414,995	1,277,098	2,467,638	2,183,494
Total assets		10,286,543	9,658,172	10,286,543	9,658,172
Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(87,313)	(76,947)	(143,445)	(128,869)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	974,748	879,318	1,753,581	1,527,053
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[2]	1,062,061	956,265	1,897,026	1,655,922
Gross profit		329,215	283,476	514,931	431,697
Depreciation, Depletion, Accretion and Amortization (DDA&A)		75,760	69,738	148,281	135,691
Total assets	[3]	9,385,444	8,751,186	9,385,444	8,751,186
Aggregates [Member] | Intersegment Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	(87,313)	(76,947)	(143,445)	(128,869)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	247,163	211,828	379,253	315,663
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1],[4]	247,163	211,828	379,253	315,663
Gross profit		27,583	25,750	24,311	25,996
Depreciation, Depletion, Accretion and Amortization (DDA&A)		8,884	7,298	17,434	14,300
Total assets	[3]	597,328	625,985	597,328	625,985
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]	103,768	106,723	187,405	207,685
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	103,768	106,723	187,405	207,685
Gross profit		12,887	13,191	21,450	23,511
Depreciation, Depletion, Accretion and Amortization (DDA&A)		3,327	3,049	6,291	6,463
Total assets	[3]	299,729	276,743	299,729	276,743
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]	2,003	2,282	3,954	4,224
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[1]	2,003	2,282	3,954	4,224
Gross profit		817	767	1,485	1,315
Depreciation, Depletion, Accretion and Amortization (DDA&A)		58	70	118	139
Total assets	[3]	4,042	4,258	4,042	4,258
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)		5,468	5,478	10,553	10,479
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 167,699	$ 125,497	$ 167,699	$ 125,497

[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, Texas and the Bahamas 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.