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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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Accounts Receivable, before Allowance for Credit Loss, Noncurrent, Effect of Discounting

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Asset Retirement Obligation, Risk-free Rate

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as noncurrent.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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