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Acquisitions and Divestitures of Oil and Gas Properties - Divestitures (Details)
3 Months Ended 12 Months Ended
Nov. 01, 2018
USD ($)
well
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
ARO liabilities settled or disposed   $ 5,400,000 $ 5,379,000 $ 31,967,000 $ 11,308,000
Gain (loss) recognized on transfer   $ 0      
Disposal Group, Not Discontinued Operations | Central Basin Platform          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
ARO liabilities settled or disposed $ 26,900,000     $ 26,900,000  
Number of common units sold (in shares) | shares 13,125,000        
Percent of common equity sold 25.00%        
Proceeds from sale of oil and natural gas properties $ 14,500,000        
Number of wells sold | well 1,066        
Disposal Group, Not Discontinued Operations | Oil and Gas Properties          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of oil and natural gas properties         $ 17,100,000