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DEFERRED REVENUE (Narrative) (Details)	3 Months Ended	12 Months Ended
DEFERRED REVENUE (Narrative) (Details)	Mar. 31, 2017 item	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Mar. 31, 2018 USD ($)
Number of quarries \| item	8
Proceeds from sale of production		$ 153,282,000	$ 73,644,000
Term of the VPPs	25 years
Forecast [Member]
Estimated deferred revenue to be recognized in the next 12 months				$ 8,080,000

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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