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Acquisition - Price Allocation (Details) - USD ($) $ in Thousands |  | 6 Months Ended
--- | --- | ---
Feb. 14, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |
Common stock: 46,000,000 shares issued |  | $ 371,220 | $ 0
Permian Basin Acquisition [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | $ 549,770 |  |
Common stock: 46,000,000 shares issued | $ 371,220 |  |
Common stock shares issued (shares) | 46,000,000 |  |
Consideration paid to Forge Energy: | $ 920,990 |  |
Proved developed properties | 110,735 |  |
Proved undeveloped properties | 167,170 |  |
Unproved lease acquisition costs | 644,040 |  |
Inventory | 293 |  |
Intangible assets | 1,000 |  |
Asset retirement obligations | $ (2,248) |  |

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