Bankruptcy Proceedings, Emergence and Fresh Start Accounting Reorganization Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	8 Months Ended
	Sep. 12, 2016	Dec. 31, 2017	Dec. 31, 2016	Sep. 13, 2016
Fresh-Start Adjustment [Line Items]
Common stock, shares issued	14,992,018	15,018,870	14,992,018	14,992,018
Proceeds from Long-term Lines of Credit	$ 75,350
Rights Offering, Rights Offering Amount	49,943
Total Reorganization Proceeds	125,293
Repayments of Long-term Debt	113,653
Interest Paid	1,374
DIP Facility Fees Paid	12
Debt Issuance Costs, Line of Credit Arrangements, Gross	3,011	$ 1,700
Plan of Reorganization, Escrow Account for Professional Fees	14,575
RBL lender fees and expenses	455
Ad Hoc Committee and indenture trustee fees and expenses	6,782
Payment of certain allowed claims and settlements	2,735
Total Reorganization Uses	142,597
Net Cash Payments off Reorganization Adjustments	$ (17,304)
Common stock, par value	$ 12.73	$ 0.01	$ 0.01	$ 0.01