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Fixed Assets and Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 11, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Asset Retirement Obligations Details [Line Items] |  |  |  |
Depreciation expense |  | $ 295,600 | $ 286,000 | $ 226,000
Depletion expense |  | 4,700 | 4,000 | 1,500
Impairment expense |  | 0 | 126,282 | 0
Asset retirement obligation |  | 175,081 | 239,865 | $ 198,187
Current Liabilities - Accrued Liabilities |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |
Asset retirement obligation |  | $ 26,600 | 67,500 |
Non-Core Offshore Gas Assets | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment [Member] | MEXICO |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |
Impairment expense |  |  | $ 82,000 |
Onshore facilities and transportation | PRB | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |
Net proceeds received on divestiture of assets | $ 300,000 |  |  |
Gain on sale of assets | 38,900 |  |  |
Impairment expense | $ 21,200 |  |  |

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