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

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- 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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- 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. + Details
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- Details
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