IMPAIRMENTS (Details) - USD ($)	8 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Abandonment and impairment of unproved properties	$ 0	$ 5,271,000
Mid-Continent Region
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Proved oil and gas property impairments		0	$ 10,000,000
Wattenburg Field Region
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]
Unproven oil and gas property impairments		$ 0	$ 24,700,000