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v3.25.0.1

Debt (Details Textual) - USD ($) shares in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 21, 2024 | Mar. 31, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |  |
Gain on debt extinguishment |  |  | $ 417 | $ 3,437 | $ 0
Finance Lease Obligations |  |  | $ 54,300 |  |
Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 7.00% |  |
Line of Credit | Rochester Finance Lease |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 60,000 |  |
Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.00% |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.00% |  |
Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.75% |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) 1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.75% |  |
Senior Notes due 2029 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 375,000 |  |  |
Proceeds from debt |  | $ 367,500 |  |  |
Extinguishment of debt |  |  | $ 5,900 |  |
Stated interest rate |  |  | 5.125% |  |
Converted shares (in shares) |  |  | 1,800 |  |
Gain on debt extinguishment |  |  | $ 400 |  |
Rochester Finance Lease | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 5.20% |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional increases in RCF | $ 100,000 |  |  |  |
Non-capitalized underground mine development costs | 15,000 |  |  |  |
Letters of credit outstanding, amount |  |  | $ 29,300 |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  |  | 6.70% |  |
Long-term debt |  |  | $ 195,000 |  |
Amount available subject to debt covenants |  |  | $ 175,700 |  |
Revolving Credit Facility | Credit Agreement | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 400,000 |  |  |  |

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