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Supplemental Financial Information - Schedule of Other Long Term Assets (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Dec. 27, 2024
Dec. 31, 2024
Jun. 30, 2025
Debt Instrument [Line Items]      
Term of contract     15 years
Prepaid expenses and other current assets:      
Prepaid expenses   $ 2,021 $ 4,309
Prepaid lender fees, net   982 1,571
Prepaid income taxes and income tax refunds   233 159
Other   1,414 1,343
Total prepaid expenses and other current assets   4,650 7,382
Other long-term assets, net:      
Spare parts, net   11,178 11,678
Right of use assets, operating leases, net   9,312 9,516
Intangible assets, net   7,569 7,376
Mine development costs, net   7,010 6,851
Upfront Customer Consideration   5,459 5,205
Mine reclamation asset, net   1,620 1,562
Other   2,581 2,601
Total other long-term assets, net   $ 44,729 $ 44,789
Revolving Credit Facility | Secured Debt      
Debt Instrument [Line Items]      
Term 5 years 5 years