SEGMENT REPORTING (Segment Financial Disclosure) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total revenues		$ 854,474	$ 787,328
Gross profit		159,334	158,221
Depreciation, depletion, accretion and amortization		81,439	71,563
Cash and cash equivalents and restricted cash		46,514	286,957	$ 146,646	$ 268,019
Total assets		9,453,211	8,744,324	$ 9,504,891
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		906,396	836,712
Total assets	[1]	9,265,699	8,309,612
Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		(51,922)
Aggregates [Member]
Segment Reporting Information [Line Items]
Total revenues		647,735
Aggregates [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	[2]	699,657	650,300
Gross profit	[3]	148,221	138,791
Depreciation, depletion, accretion and amortization		65,953	57,656
Total assets	[1]	8,545,904	7,810,486
Aggregates [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		(51,922)	(49,384)
Asphalt [Member]
Segment Reporting Information [Line Items]
Total revenues		103,835
Asphalt [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		103,835	95,776
Gross profit	[3]	246	8,482
Depreciation, depletion, accretion and amortization		7,002	5,731
Total assets	[1]	447,961	258,982
Asphalt [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		0
Concrete [Member]
Segment Reporting Information [Line Items]
Total revenues		100,962
Concrete [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		100,962	88,750
Gross profit	[3]	10,320	10,225
Depreciation, depletion, accretion and amortization		3,414	3,023
Total assets	[1]	267,678	235,592
Concrete [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		0
Calcium [Member]
Segment Reporting Information [Line Items]
Total revenues		1,942
Calcium [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues		1,942	1,886
Gross profit		547	723
Depreciation, depletion, accretion and amortization		69	195
Total assets	[1]	4,156	4,552
Calcium [Member] | Intersegment sales [Member]
Segment Reporting Information [Line Items]
Total revenues		0
Other Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, depletion, accretion and amortization		5,001	4,958
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets		$ 140,998	$ 147,755

[1] 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.

[2] Includes product sales, as well as freight & delivery costs that we pass along to our customers, and service revenues related to aggregates.

[3] The 2017 amounts have been revised as a result of our adoption of ASU 2017-07 as described in Note 17