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UNAUDITED SUPPLEMENTAL OIL AND GAS INFORMATION (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Future cash inflows	$ 27,769	$ 78,646	$ 381,156
Future cash outflows:
Production costs	(18,814)	(44,685)	(149,450)
Development costs		(8,050)	(70,770)
Income taxes			(12,719)
Future net cash flows	8,955	25,911	148,217
10% annual discount factor	(2,208)	(8,143)	(66,328)
Standardized measure of discounted future net cash flows	$ 6,747	$ 17,768	$ 81,889	$ 104,853

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