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- Definition

Disposal Group, Number Of Assets Abandoned

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- Definition

Proceeds from Sale of Productive Asset and Other Asset (Investment in Lease/Direct Financing Lease)

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- Definition

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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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

The noncash expense charged against earnings to recognize the consumption of natural resources.

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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No definition available.

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- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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

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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