OTHER SUPPLEMENTAL INFORMATION (Supplemental Cash Flows and Non-Cash Transactions) (Details) - USD ($) $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
	May 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OTHER SUPPLEMENTAL INFORMATION [Abstract]
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Successor	Successor	Predecessor	Predecessor
Supplemental cash flows information:
Cash paid for interest	$ 6,008	$ 6,110	$ 1,119		$ 38,758
Cash paid for reorganization items	$ 6,691	9,021	472
Disbursed from restricted cash account		$ 6,900
Non-cash transactions:
Costs for additions to oil and natural gas properties in accounts payable and accrued liabilities			$ 287	$ 419
Shares of common stock of Magnolia received in Central Texas Divestiture				$ 58,212