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Acquisition - Price Allocation (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 14, 2018 | Mar. 31, 2018 | Mar. 31, 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 |  |
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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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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