SUPPLEMENTAL INFORMATION ON OIL AND NATURAL GAS OPERATIONS - UNAUDITED - Net Costs Incurred on Unevaluated Properties (Details) - USD ($) $ in Thousands	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Acquisition costs	$ 58,359	$ (9,155)	$ 49,204
Exploration costs	38,651	10,405	49,056
Capitalized interest	0	3,927	3,927
Total unevaluated costs	97,010	$ 5,177	$ 102,187
Predecessor
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]
Acquisition costs	959			$ (71,378)	$ (115,767)
Exploration costs	(6,063)			(21,579)	(16,315)
Capitalized interest	2,524			26,634	41,339
Total unevaluated costs	$ (2,580)			$ (66,323)	$ (90,743)