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Unaudited Supplemental Oil and Gas Information - Schedule of Standardized Measure of Future Net Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Standardized measure, beginning of year	$ 6,747	$ 17,768	$ 81,889
Sales of oil and gas, net of production costs	(3,143)	(3,102)	(2,944)
Net changes in prices and production costs	2,347	(9,248)	(96,586)
Changes in estimated future development costs		6,590	51,998
Extensions and discoveries	511	167	2,260
Sale of minerals in place	(1,049)	(78)
Revisions in previous quantity estimates	3,416	(6,791)	(27,693)
Previously estimated development costs incurred
Net changes in income taxes			3,306
Accretion of discount	675	1,777	8,189
Changes in timing and other	(251)	(336)	(2,651)
Standardized measure, end of year	$ 9,253	$ 6,747	$ 17,768

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.

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