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Divestitures and Assets Held for Sale (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of properties |  |  | $ 41,039 | $ 333,029
Foreman Butte Area | Divestitures |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposition of oil and gas property |  |  | (3,200) |
Partial interests in certain oil and gas properties | Exploration and Production Revenues | Divestitures |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposition of oil and gas property |  | $ (700) | (700) |
2019 Divestitures | Held for Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Exploration and production capital expenditures |  | 6,700 | 6,700 |
Proceeds from sale of properties |  | $ 500 | $ 500 |
2019 Divestitures | Subsequent Event | Held for Sale |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain (loss) on disposition of oil and gas property | $ 500 |  |  |

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