ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Accrued asset retirement obligations	$ 0	$ 162,000
Asset retirement obligations for oil and gas properties assets held for sale	0	10,591,000
Change in asset retirement obligations
Beginning of year	25,688,000	21,626,000
Additional liabilities incurred	90,000	560,000
Accretion expense	2,601,000	1,944,000
Liabilities settled	(691,000)	(469,000)
Revisions to estimate		2,027,000
End of year	$ 30,833,000	25,688,000
Accounts payable and accrued expenses
Business Acquisition [Line Items]
Accrued asset retirement obligations		162,000
Assets Held-for-sale
Business Acquisition [Line Items]
Asset retirement obligations for oil and gas properties assets held for sale		$ 10,600,000
Minimum
Business Acquisition [Line Items]
Discount rate (as a percent)	8.00%
Maximum
Business Acquisition [Line Items]
Discount rate (as a percent)	18.00%