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INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax benefit at federal statutory rate	$ 4,801	$ 31,585	$ 711
State income tax benefit, net of federal impact	292	1,440	34
Incentive stock options and restricted stock not deductible for tax purposes		(269)	(79)
Percentage depletion carryover	19		129
Other, net	534	171	(183)
Increase in valuation allowance	(5,646)	(32,927)	(612)
Income tax benefit (expense)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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