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Acquisitions and Divestitures - Allocation of Purchase Price (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 14, 2018 | Dec. 31, 2020 | Nov. 19, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combination, Consideration Transferred [Abstract] |  |  |  |  |
Common stock: 46,000,000 shares issued |  | $ 0 | $ 0 | $ 0 | $ 371,220
Permian Basin Acquisition |  |  |  |  |
Business Combination, Consideration Transferred [Abstract] |  |  |  |  |
Cash | $ 549,770 |  |  |  |
Common stock: 46,000,000 shares issued | 371,220 |  |  |  |
Consideration paid to Forge Energy: | $ 920,990 |  |  |  |
Shares issued as consideration (in shares) | 46,000,000 |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: |  |  |  |  |
Proved developed properties | $ 110,325 |  |  |  |
Proved undeveloped properties | 166,552 |  |  |  |
Unproved lease acquisition costs | 645,068 |  |  |  |
Inventory | 293 |  |  |  |
Intangible assets | 1,000 |  |  |  |
Liabilities assumed [Abstract] |  |  |  |  |
Asset retirement obligations | (2,248) |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed: | $ 920,990 |  |  |  |

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