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UNAUDITED SUPPLEMENTAL OIL AND GAS INFORMATION (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Future cash inflows	$ 78,646	$ 381,156	$ 330,245
Future cash outflows:
Production costs	(44,685)	(149,450)	(129,392)
Development costs	$ (8,050)	(70,770)	(37,739)
Income taxes		(12,719)	(14,500)
Future net cash flows	$ 25,911	148,217	148,614
10% annual discount factor	(8,143)	(66,328)	(43,761)
Standardized measure of discounted future net cash flows	$ 17,768	$ 81,889	$ 104,853	$ 71,017

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