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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Asset Retirement Obligations Details [Line Items]
Asset Impairment Charges	$ 277,495	$ 0	$ 277,495	$ 0
Asset retirement obligation balance	170,300		170,300		$ 175,081
Accrued Liabilities
Asset Retirement Obligations Details [Line Items]
Asset retirement obligation balance	11,600		$ 11,600		$ 26,600
Onshore Facilities and Transportation | COVID-19
Asset Retirement Obligations Details [Line Items]
Asset Impairment Charges	277,500
Impairment of net fixed assets	272,700
Impairment of right of use assets	$ 4,800

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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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