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Debt (Details Textual) - USD ($) shares in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 11 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2025 | Feb. 21, 2024 | Nov. 09, 2022 | May 02, 2022 | Mar. 01, 2021 | Mar. 31, 2021 | Oct. 31, 2018 | Sep. 30, 2024 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 14, 2020 | Dec. 13, 2020 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | $ 3,437 | $ 0 | $ (9,173) |  |  |  |
Financing cash flows from finance leases |  |  |  |  |  |  |  |  |  |  | 24,505 | 31,316 | $ 31,544 |  |  |  |
Finance Lease Obligations |  |  |  |  |  |  |  |  |  |  | $ 35,200 |  |  |  |  |  |
Rochester Finance Lease | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 60,000 |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 5.20% |  |  |  |  |  |
Senior Notes due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 375,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  |  |  | $ 367,500 |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 76,000 |  |  |  |  |  |
Converted shares (in shares) |  |  |  |  |  |  |  |  |  |  | 25,200 |  |  |  |  |  |
Gain on debt extinguishment |  |  |  |  |  |  |  |  |  |  | $ 3,400 |  |  |  |  |  |
Senior Notes due Two Thousand Twenty Four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 5.125% |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 300,000 |  | $ 250,000 |  |  |  |  |  |  | $ 200,000 | $ 300,000 | $ 250,000 | $ 200,000
Line of credit facility |  |  |  |  | $ 100,000 |  | $ 50,000 |  |  |  |  |  |  |  |  |  |
Integration costs |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash on hand |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  |  | $ 29,600 |  |  |  |  |  |
Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional increases in RCF |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-capitalized underground mine development costs |  | 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio | $ 15,000 |  |  |  |  |  |  | $ 40,000 | $ 30,000 | $ 50,000 |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  |  |  | 9.20% |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | $ 175,000 |  |  |  |  |  |
Amount available subject to debt covenants |  |  |  |  |  |  |  |  |  |  | $ 185,400 |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 390,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Credit Agreement | Line of Credit | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Revolving Credit Facility | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis rate |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis rate |  |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Maximum | Revolving Credit Facility | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis rate |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |
Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis rate |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |

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