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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

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