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Supplemental Gas Data (unaudited) - Average Unit Prices and Average Production Costs (Details) Mcfe in Thousands	12 Months Ended
	Dec. 31, 2020 usd_per_mcfe Mcfe	Dec. 31, 2019 usd_per_mcfe Mcfe	Dec. 31, 2018 usd_per_mcfe Mcfe
Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31)
Production (MMcfe) | Mcfe	511,072	539,149	507,104
Natural Gas, Per Thousand Cubic Feet
Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31)
Total Average Sales Price Before Effects of Commodity Derivative Financial Settlements (per Mcfe)	1.75	2.53	3.11
Average Effects of Commodity Derivative Financial Settlements (per Mcfe)	0.74	0.14	(0.15)
Total Average Sales Price Including Effects of Commodity Derivative Financial Settlements (per Mcfe)	2.49	2.66	2.97
Average Lifting Costs, Excluding Ad Valorem and Severance Taxes (per Mcfe)	0.08	0.12	0.19

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Average Gas Sales Price before effects of financial settlements

+ References

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- Definition

Average Lifting Costs, Excluding Ad Valorem And Severance Taxes

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- Definition

Average effects of financial settlements (per thousand cubic feet)

+ References

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- Definition

Average gas sales price including effects of financial settlements (per thousand cubic feet)

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- Definition

Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Form 20-F
-Section Item 18
-Subsection Instruction 2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 5
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447

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