Summary of Significant Accounting Policies - Schedule of Percent of Consolidated Revenue of Major Customers, Those Whose Total Represented 10% or More of Oil, Natural Gas and NGL Revenues (Details) - Sales Revenue - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shell Trading (US) Company
Concentration Risk [Line Items]
Concentration risk, percentage	65.00%	80.00%	68.00%
Phillips 66
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%
Chevron U.S.A Inc
Concentration Risk [Line Items]
Concentration risk, percentage			14.00%