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GOODWILL AND INTANGIBLE ASSETS (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Goodwill impairment charges	$ 0	$ 0	$ 0
Number of Reportable Segments \| segment	4
Other intangible assets, net, Impairment Charges	$ 0	$ 0
Calcium [Member]
Goodwill [Line Items]
Goodwill, accumulated impairment losses	$ 252,664
Aggregates [Member]
Goodwill [Line Items]
Other intangible assets, net, Impairment Charges			$ 8,180