Bankruptcy Proceedings, Emergence and Fresh Start Accounting Valuation Process (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2016	Sep. 12, 2016	Dec. 31, 2015
Reorganizations [Abstract]
Fresh Start Valuation - Discount Rate for Gathering and Transportation Costs			1350.00%
Fair Value of Proved Reserves			$ 121,900
Asset retirement obligations			2,700	$ 2,621
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	$ 1,700		3,011
Plan of Reorganization, Line of Credit Facility, Initial Borrowing		$ 75,400	$ 75,400