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ACQUISITIONS AND DIVESTITURES (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
ACQUISITIONS AND DIVESTITURES (Narrative) (Details)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) property
Significant Acquisitions and Disposals [Line Items]
Total consideration					$ 47,198,000
Payment for acquisition of businesses			$ 1,611,000	$ 21,387,000	27,198,000
Exchanges of real property and businesses					20,000,000
Assets held for sale	$ 0	$ 0	0	0	$ 0
Gain on sale of properties and businesses	$ 356,000	$ 249,000	911,000	6,624,000
Purchases of property, plant & equipment			199,764,000	$ 148,721,000
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