INCOME TAXES (Schedule of Net deferred tax) (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
Deferred tax assets:
Financial Designation, Predecessor and Successor [Fixed List]	Predecessor	Successor	Successor	Successor	Predecessor	Predecessor
Net operating loss carryforward		$ 19,086	$ 30,643	$ 19,086
Asset retirement obligation		26,948	19,909	26,948
Other		2,365	1,588	2,365
Total deferred tax assets before valuation allowance		48,399	52,140	48,399
Valuation allowance		(15,573)	(45,976)	(15,573)
Net deferred tax assets		32,826	6,164	32,826
Deferred tax liability:
Oil and natural gas properties		30,200	4,785	30,200
Derivative instruments		2,626	1,379	2,626
Total deferred tax liability		32,826	6,164	32,826
Deferred Tax Assets, Net, Total		$ 0	$ 0	$ 0