REVENUES (Narrative) (Details)		3 Months Ended		12 Months Ended
		Mar. 31, 2019 USD ($) item	Mar. 31, 2018 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2020 USD ($)
Revenue Recognition [Line Items]
Revenues	[1]	$ 996,511,000	$ 854,474,000
Number of quarries | item		8
Proceeds from sale of future production				$ 226,926,000	$ 226,926,000
Term of the VPPs		25 years
Service [Member]
Revenue Recognition [Line Items]
Revenues		$ 34,515,000	18,639,000
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						$ 7,500,000
Aggregates [Member]
Revenue Recognition [Line Items]
Revenues	[1]	$ 778,833,000	$ 647,735,000
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] 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 BahamasWest market - Arizona, California and New Mexico