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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Capitalized costs	$ 161,553,000	$ 195,139,000	$ 294,345,000
Maximum reserves sold from cost center not expected to result in significant alteration (less than)	25.00%
Interest capitalized during period	$ 1,500,000	0	0
Natural gas balancing liability	1,600,000	1,700,000
Internal Costs
Significant Accounting Policies [Line Items]
Capitalized costs	$ 5,700,000	$ 8,800,000	$ 14,800,000
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

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

+ References

No definition available.

+ Details

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X

- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

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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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Balance Type:	debit
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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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- Details

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