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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 MBoe | Dec. 31, 2018 MBoe | Dec. 31, 2017 MBoe | Dec. 31, 2016 MBoe
Extractive Industries [Abstract] |  |  |  |
Percentage of proved reserves estimates prepared by external engineers | 0.90 |  |  |
Proved developed and undeveloped reserves (MBoe) | 89,885 | 160,176 | 177,594 | 163,955
Decrease due to change in accounting (MBoe) | 50,900 |  |  |
Decrease due to change in accounting, PUD | 39,800 |  |  |
Decrease due to change in accounting, Remaining Proved Reserves | 11,100 |  |  |
Revision of previous estimates due to changes in commodity pricing (MBoe) | 10,900 |  |  |
Revision of previous estimates due to changes in well performance (MBoe) | 3,200 | 8,300 |  |
Improved recovery (MBoe) | 12,600 |  |  |
Change in economic life |  | 24,900 |  |
Revision of previous estimates (MBoe) | (58,514) | (33,188) | 10,879 |
Sales of reserves in place (MBoe) | 905 | 6,577 | 1,909 |
Acquisitions of new reserves (MBoe) |  | 15,350 | 202 |
Upward revision of estimates due to extensions (MBoe) | 1,084 | 19,332 | 19,373 |

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