[Line Items] for Asset Retirement Obligations Details [Table]

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

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Fixed Assets and Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 11, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Asset Retirement Obligations Details [Line Items]
Depreciation expense		$ 286,000	$ 226,000	$ 194,000
Depletion expense		4,000	1,500
Impairment expense		126,282	0	0
Asset retirement obligation		239,865	198,187	$ 213,726
Current Liabilities - Accrued Liabilities
Asset Retirement Obligations Details [Line Items]
Asset retirement obligation		67,500	20,900
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
Non-Core Natural Gas Gathering and Platform Assets \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| MEXICO
Asset Retirement Obligations Details [Line Items]
Gain on sale of assets			$ 40,300
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