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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Capitalized costs	$ 8,269	$ 161,553
Maximum reserves sold from cost center not expected to result in significant alteration (less than)	25.00%
Percentage depletion rate of reserves (greater than)	0.10
Interest capitalized during period	$ 700	1,500
Natural gas balancing liability	1,100	1,600
Internal Costs
Significant Accounting Policies [Line Items]
Capitalized costs	$ 700	$ 5,700
Minimum | Buildings and structures
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	7 years
Minimum | Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	1 year
Maximum | Buildings and structures
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	39 years
Maximum | Equipment
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	27 years

X

- Definition

Percentage Change Depletion Rate of Reserves Resulting In Significant Alteration Threshold

+ References

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+ Details

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- Definition

The maximum percentage of reserves from a cost center that if sold would not ordinarily be expected to result in a significant alteration.

+ References

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- Definition

Significant Accounting Policies [Line Items]

+ References

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X

- Definition

Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

+ References

No definition available.

+ Details

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X

- Definition

The value of gas balancing asset or liability as of the end of the period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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