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Asset Retirement Obligations (Narrative) (Details) - Bellaire - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Initial investment amount			$ 5.0
Fair value of trust assets	$ 9.9	$ 12.3

X

- Definition

Asset Retirement Obligation, Legally Restricted Assets, Initial Investment Amount

+ References

No definition available.

+ Details

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- Definition

Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

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X

- 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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- Details

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