REVENUES (Narrative) (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Revenue Recognition [Line Items]
Revenues	[1]	$ 1,309,890	$ 1,418,758	$ 3,681,707	$ 3,742,951
Number of quarries | item				8
Proceeds from sale of future production						$ 226,926	$ 226,926
Term of the VPPs				25 years
Estimated deferred revenue to be recognized in the next 12 months		179,917	186,927	$ 179,917	186,927				$ 181,963	$ 185,339	$ 189,052	$ 192,783
Service [Member]
Revenue Recognition [Line Items]
Revenues		63,347	75,508	$ 160,285	175,280
Minimum [Member]
Revenue Recognition [Line Items]
Coverage of warranty provisions				9 months
Maximum [Member]
Revenue Recognition [Line Items]
Coverage of warranty provisions				1 year
Maximum [Member] | Construction Paving [Member]
Revenue Recognition [Line Items]
Costs for paving contracts expense, expected amortization period				1 year
Forecast [Member]
Revenue Recognition [Line Items]
Estimated deferred revenue to be recognized in the next 12 months								$ 7,500
Aggregates [Member]
Revenue Recognition [Line Items]
Revenues	[1]	$ 970,528	$ 1,033,438	$ 2,780,243	$ 2,787,019
Aggregates [Member] | Minimum [Member]
Revenue Recognition [Line Items]
Percent of shipments used for publicly funded construction				45.00%
Aggregates [Member] | Maximum [Member]
Revenue Recognition [Line Items]
Percent of shipments used for publicly funded construction				55.00%

[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