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Fixed Assets and Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Depreciation expense |  |  | $ 295,400 | $ 276,400 | $ 295,600
Depletion expense |  |  | 3,600 | 3,200 | 4,700
Impairment expense |  |  | 0 | 280,826 | 0
Asset retirement obligation |  |  | 220,906 | 176,852 | $ 175,081
Current Liabilities - Accrued Liabilities |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Asset retirement obligation |  |  | 36,300 | 14,700 |
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 |  |  |  |
Onshore facilities and transportation | COVID-19 |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Impairment expense |  |  |  | 277,500 |
Impairment of Long-Lived Assets Held-for-use |  |  |  | 272,700 |
Operating Lease, Impairment Loss |  |  |  | $ 4,800 |
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 |  |
Loss on sale of assets | $ 22,000 |  |  |  |
Offshore pipeline transportation |  |  |  |  |
Asset Retirement Obligations Details [Line Items] |  |  |  |  |
Impairment expense |  | $ 3,300 |  |  |

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