OTHER SUPPLEMENTAL INFORMATION (Supplemental Cash Flows and Non-Cash Transactions) (Details) - USD ($) $ in Thousands	1 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2018	May 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Supplemental cash flows information:
Cash paid for interest	$ 1,185		$ 1,119
Cash paid for reorganization items	$ 111		472
Non-cash transactions:
Costs for additions to oil and natural gas properties in accounts payable and accrued liabilities			$ 22	$ 6,732
Predecessor
Supplemental cash flows information:
Cash paid for interest		$ 6,008
Cash paid for reorganization items		$ 6,691