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Acquisitions - Acquisitions (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 12, 2018 USD ($) | Feb. 14, 2018 USD ($) a shares | Apr. 25, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions of oil and gas properties |  |  |  |  | $ 61,874 | $ 781,522
Permian Basin Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acres acquired | a |  | 22,000 |  |  |  |
Aggregate cash consideration paid |  | $ 549,770 |  |  |  |
Shares issued as consideration (shares) | shares |  | 46,000,000 |  |  |  |
Estimated fair value of assets acquired and liabilities assumed |  | $ 920,990 |  |  |  |
Total revenue of acquiree included in consolidated financial statements |  |  |  | $ 71,700 |  |
Operating loss of acquiree included in consolidated financial statements |  |  |  | 15,600 |  |
Finite-lived intangible asset recorded |  | 1,000 |  |  |  |
Other Delaware Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated fair value of assets acquired and liabilities assumed | $ 59,500 |  |  |  |  |
MIdstream Assets Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated fair value of assets acquired and liabilities assumed |  |  | $ 12,700 |  |  |
Installment notes payable |  |  | 4,900 |  |  |
Fair value of assets acquired |  |  | $ 12,700 |  |  |
Forge Energy | Permian Basin Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Security Deposit |  | $ 47,300 |  |  |  |
Several Acreage and Producing Assets |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisitions of oil and gas properties |  |  |  | 18,700 | $ 6,100 |
Noncompete agreements | Permian Basin Acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life of intangible asset |  | 1 year |  |  |  |
Amortization expense of non-compete agreement |  |  |  | $ 900 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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