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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Asset Retirement Obligations Details [Line Items]
Asset Impairment Charges	$ 3,331	$ 0	$ 280,826	$ 0
Asset retirement obligation balance	170,952		170,952		$ 175,081
Accrued Liabilities
Asset Retirement Obligations Details [Line Items]
Asset retirement obligation balance	11,200		11,200		$ 26,600
Onshore Facilities and Transportation | COVID-19
Asset Retirement Obligations Details [Line Items]
Asset Impairment Charges			277,000
Impairment of net fixed assets			272,000
Impairment of right of use assets			$ 5,000
Offshore pipeline transportation
Asset Retirement Obligations Details [Line Items]
Asset Impairment Charges	$ 3,300

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of loss from impairment of right-of-use asset from operating lease.

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