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Fixed Assets and Asset Retirement Obligations (Narrative) (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 30, 2020 USD ($) | Oct. 11, 2018 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) asset
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Depreciation expense |  |  | $ 276,400 | $ 295,600 | $ 286,000
Depletion expense |  |  | 3,200 | 4,700 | 4,000
Impairment expense |  |  | 280,826 | 0 | 126,282
Asset retirement obligation |  |  | 176,852 | 175,081 | 239,865
Current Liabilities - Accrued Liabilities |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Asset retirement obligation |  |  | 14,700 | $ 26,600 |
NEJD and Free State | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Proceeds from sale of assets | $ 22,500 |  |  |  |
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
Number of offshore hub platforms and pipelines abandoned | asset |  |  |  |  | 1
Onshore facilities and transportation | COVID-19 |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Impairment expense |  |  | 277,000 |  |
Impairment of Long-Lived Assets Held-for-use |  |  | 272,000 |  |
Operating Lease, Impairment Loss |  |  | 5,000 |  |
Onshore facilities and transportation | NEJD and Free State | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Total consideration on sale of assets | 92,500 |  | 70,000 |  |
Gain (loss) on sale of assets | $ (22,000) |  |  |  |
Onshore facilities and transportation | Powder River Basin | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Total consideration on sale of assets |  | $ 300,000 |  |  |
Gain (loss) on sale of assets |  | 38,900 |  |  |
Impairment expense |  | $ 21,200 |  |  |
Offshore pipeline transportation |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Impairment expense |  |  | $ 3,300 |  |

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