Bankruptcy Proceedings, Emergence and Fresh Start Accounting Valuation Process (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 12, 2016
Reorganizations [Abstract]
Fresh Start Valuation - Discount Rate for Gathering and Transportation Costs					1350.00%
Fair Value of Proved Reserves					$ 121,900
Asset retirement obligations	$ 4,314	$ 3,286	$ 2,459		2,700
Fair Value of Undeveloped Acreage - Eagle Ford					92,500
Fair Value of Undeveloped Acreage - Other than Eagle Ford					8,300
Fair Value of Other Fixed Assets					26,700
Fair Value of South Texas Water Facility					23,400
Debt Issuance Costs, Line of Credit Arrangements, Gross	$ 900	$ 1,700			3,011
Plan of Reorganization, Line of Credit Facility, Initial Borrowing				$ 75,400	$ 75,400