Quarterly report pursuant to Section 13 or 15(d)

Acquisitions??and Divestiture (Narrative - Dispositions) (Details)

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Acquisitions and Divestiture (Narrative - Dispositions) (Details) - Certain Non-core Assets in the Midland Basin
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
a
Jun. 30, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Consideration $ 244,900,000 $ 244,900,000
Potential contingency payments $ 60,000,000.0 $ 60,000,000.0
Potential contingency payments, period 3 years  
Area of land | a 9,850  
Working interest   66.00%
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal $ 0