CONCENTRATIONS - Customers from Whom We Derived 10% or More of Total Oil and Gas Revenue (Details) - Customer Concentration Risk - Sales Revenue, Product Line	2 Months Ended	10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Phillips 66 Company
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived		74.00%
Shell Trading (US) Company
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived		15.00%
Williams Ohio Valley Midstream LLC
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived		0.00%
Conoco
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived		0.00%
Predecessor | Phillips 66 Company
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived	56.00%		68.00%	53.00%
Predecessor | Shell Trading (US) Company
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived	7.00%		10.00%	13.00%
Predecessor | Williams Ohio Valley Midstream LLC
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived	12.00%		2.00%	9.00%
Predecessor | Conoco
Concentration Risk [Line Items]
Customers from whom 10% or more revenue derived	11.00%		5.00%	2.00%