Supplementary Information on Oil and Natural Gas Activities (Unaudited) - Schedule of Changes in Standardized Measure of Future Net Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Extractive Industries [Abstract]
Standardized measure at beginning of year	$ 57,575	$ 365,284	$ 276,633
Sales and transfers of oil, natural gas and natural gas liquids produced, net of production costs	(9,231)
Net changes in prices and production costs	(31,738)	(314,367)	(36,869)
Development costs incurred during the period	45,611
Revisions and other	(23,579)	(122,584)	17,351
Accretion of discount	5,757	36,528	27,663
Changes in estimated future development costs	(822)	99,964	49,700
Changes in timing and other	(4,623)	(7,250)	30,806
Standardized measure, ending	$ 38,950	$ 57,575	$ 365,284