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Divestitures and Assets Held for Sale (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 12, 2018 | Jul. 10, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of properties |  |  |  |  | $ 2,236 | $ 4,000
Foreman Butte Divestiture [Member] | Held for Sale [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Impairment loss recorded |  |  |  | $ 383,400 |  |
Net book value of assets held for sale |  |  |  | 131,576 | 131,576 |
Net book value of liabilities held for sale |  |  |  | 2,576 | 2,576 |
Williston Non-Op Divestiture [Member] | Held for Sale [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Net book value of assets held for sale |  |  |  | 118,542 | 118,542 |
Net book value of liabilities held for sale |  |  |  | $ 1,605 | $ 1,605 |
Subsequent Event [Member] | 2018 Divestitures [Member] | Held for Sale [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of properties |  |  | $ 282,500 |  |  |
Subsequent Event [Member] | Williston Non-Op Divestiture [Member] | Held for Sale [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of properties | $ 55,000 |  |  |  |  |
Net gain on sale of properties |  | $ 33,200 |  |  |  |
Net book value of assets held for sale | 33,900 |  |  |  |  |
Net book value of liabilities held for sale | $ 400 |  |  |  |  |

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