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Supplemental Financial Information - Schedule of Change in Asset Retirement Obligation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Asset retirement obligations, beginning of period | $ 6,163 | $ 6,163 | $ 8,533
Asset retirement obligations assumed |  | 0 | 1,500
Accretion |  | 496 | 582
Liabilities settled |  | (65) | (4,866)
Changes due to scope and timing of reclamation |  | 0 | 414
Asset retirement obligations, end of period |  | 6,594 | 6,163
Less current portion |  | 1,259 | 182
Asset retirement obligations, long-term |  | 5,335 | 5,981
Business Acquisition [Line Items] |  |  |
Asset retirement obligations assumed |  | 0 | 1,500
Liabilities settled |  | $ 65 | $ 4,866
Marshall Mine | Disposed of by Sale |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Liabilities settled | (4,700) |  |
Business Acquisition [Line Items] |  |  |
Liabilities settled | 4,700 |  |
Corbin ARO |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Asset retirement obligations assumed | 500 |  |
Business Acquisition [Line Items] |  |  |
Asset retirement obligations assumed | 500 |  |
Mine 4 ARO |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Asset retirement obligations assumed | 1,000 |  |
Business Acquisition [Line Items] |  |  |
Asset retirement obligations assumed | $ 1,000 |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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