Debt Covenant, Amount Of Non-Capitalized Underground Mine Development Costs To Be Excluded From EBITDA

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Debt (Details Textual) - USD ($) shares in Thousands, $ in Thousands		1 Months Ended	3 Months Ended
	Feb. 21, 2024	Mar. 31, 2021	Mar. 31, 2024	Mar. 31, 2023	May 02, 2022
Debt Instrument [Line Items]
Gain on debt extinguishment			$ 438	$ 0
Finance Lease Obligations			1,000
Senior Notes due 2029
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 375,000
Proceeds from debt		$ 367,500
Extinguishment of debt			$ 5,900
Converted shares (in shares)			1,800
Gain on debt extinguishment			$ 400
Revolving Credit Facility
Debt Instrument [Line Items]
Additional increases in RCF	$ 100,000
Non-capitalized underground mine development costs	15,000
Line of credit facility	10,000
Letters of credit outstanding, amount			$ 29,600
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Stated interest rate			9.20%
Long-term debt			$ 225,000
Amount available subject to debt covenants			$ 145,400
Revolving Credit Facility \| Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 400,000				$ 390,000