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Acquisitions - Allocation of Purchase Price (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 14, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Combination, Consideration Transferred [Abstract] |  |  |  |
Common stock: 46,000,000 shares issued |  | $ 371,220 | $ 0 | $ 0
Permian Basin Acquisition |  |  |  |
Business Combination, Consideration Transferred [Abstract] |  |  |  |
Cash | $ 549,770 |  |  |
Common stock: 46,000,000 shares issued | $ 371,220 |  |  |
Shares issued as consideration (shares) | 46,000,000 |  |  |
Consideration paid to Forge Energy: | $ 920,990 |  |  |
Assets acquired: |  |  |  |
Proved developed properties | 110,325 |  |  |
Proved undeveloped properties | 166,552 |  |  |
Unproved lease acquisition costs | 645,068 |  |  |
Inventory | 293 |  |  |
Intangible assets | 1,000 |  |  |
Liabilities assumed: |  |  |  |
Asset retirement obligations | (2,248) |  |  |
Total identifiable net assets | $ 920,990 |  |  |

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