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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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