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UNAUDITED SUPPLEMENTAL OIL AND GAS INFORMATION (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]      
Standardized measure, beginning of year $ 81,889 $ 104,853 $ 71,017
Sales of oil and gas, net of production costs (2,944) (21,741) (23,178)
Net changes in prices and production costs (96,586) (17,376) 2,543
Changes in estimated future development costs 51,998 (1,869) (6,414)
Extensions and discoveries $ 2,260 14,706 $ 54,360
Sale of minerals in place (13,339)
Revisions in previous quantity estimates $ (27,693) (4,815) $ (2,961)
Previously estimated development costs incurred 7,175 8,344
Net changes in income taxes $ 3,306 6,924 (4,245)
Accretion of discount 8,189 10,090 7,647
Changes in timing and other (2,651) (2,719) (2,260)
Standardized measure, end of year $ 17,768 $ 81,889 $ 104,853