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Marshall Mine Asset Retirement Obligation and Cabot Receivable - ARO and Cabot Receivable (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Asset Retirement Obligation and related Long-Term Receivable [Abstract] |  |  |  |  |  |  |  |
Reclamation costs | $ 21,300,000 |  |  |  |  |  |  |
Expected future cash flows | $ 23,700,000 |  |  |  |  |  |  |
Risk-free rate | 7.00% |  | 7.00% |  |  | 7.00% |  |
Long-term receivable | $ 9,700,000 |  | $ 9,700,000 |  |  | $ 9,700,000 |  |
Discount rate | 1.50% |  | 1.50% |  |  | 1.50% |  |
Effect of discounting | $ 500,000 |  | $ 500,000 |  |  | $ 500,000 |  |
Reclamation reimbursements | $ 10,200,000 |  |  |  |  |  |  |
Allowance for credit losses |  | $ 0 |  |  | $ 0 |  | $ 0 |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligation |  | 12,884,000 |  |  | 12,884,000 |  | 21,447,000 | $ 2,721,000
Gain on change in estimate, asset retirement obligation |  | 0 | $ 0 |  | (1,942,000) | $ 0 |  |
Marshall Mine |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Asset retirement obligation |  | $ 9,400,000 |  |  | $ 9,400,000 |  | $ 18,100,000 |
Gain on change in estimate, asset retirement obligation |  |  |  | $ 1,900,000 |  |  |  |

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- Definition Asset Obligation, Expected Future Cash Flows + References No definition available. + Details
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- Definition Asset Retirement Obligation and related Long-Term Receivable + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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