Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section 35
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=66906256&loc=d3e66150-109466

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Properties and Equipment, Net - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			9 Months Ended
	Jul. 31, 2018	Feb. 28, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets						$ 675,525	$ 32,711
Impairment of oil and gas properties			$ 0		$ 0	0	68,555
Gain (loss) on sale of assets			$ 25,655		$ (11,872)	(14,850)	$ (13,498)
Haynesville Shale \| Oil and Gas Properties, Proved and Unproved
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets	$ 30,000			$ 5,000
Gain (loss) on sale of assets				29,500
East Texas \| Oil and Gas Properties, Proved and Unproved
Property, Plant and Equipment [Line Items]
Proceeds from sale of assets		$ 765,000
Impairment of oil and gas properties				$ 414,300
West Virginia, Virginia, and Ohio \| Oil and Gas Properties, Proved and Unproved
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets						$ (45,200)