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ACQUISITIONS AND DIVESTITURES (Narrative) (Details)	3 Months Ended		12 Months Ended
ACQUISITIONS AND DIVESTITURES (Narrative) (Details)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) property
Significant Acquisitions and Disposals [Line Items]
Total consideration			$ 47,198,000
Payment for acquisition of businesses	$ 1,611,000	$ 0	27,198,000
Exchanges of real property and businesses			20,000,000
Assets held for sale	0	0	$ 0
Gain on sale of properties and businesses	555,000	6,375,000
Purchases of property, plant & equipment	108,284,000	$ 49,611,000
Aggregates [Member] \| Arizona and New Mexico [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired \| property			3
Aggregates [Member] \| Tennessee [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired \| property			1
Concrete [Member] \| Arizona and New Mexico [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired \| property			7
Asphalt Mix [Member] \| Arizona [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired \| property			13
Trucking Business Assets [Member]
Significant Acquisitions and Disposals [Line Items]
Payment for acquisition of businesses	$ 1,611,000
California ready-mixed concrete operations [Member] \| California [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities divested \| property			12
Gain on sale of properties and businesses			$ 5,886,000