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, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental cash flows information:
Cash paid for interest		$ 6,110
Cash paid for reorganization items		9,021
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			$ 419
Shares of common stock of Magnolia received in Central Texas Divestiture			$ 58,212
Predecessor
Supplemental cash flows information:
Cash paid for interest	$ 6,008			$ 38,758	$ 39,807
Cash paid for income taxes					$ 10,942
Cash paid for reorganization items	$ 6,691
Non-cash transactions:
Costs for additions to oil and natural gas properties in accounts payable and accrued liabilities				$ 12,748