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Supplemental Financial Information - Schedule of Other Long Term Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Prepaid expenses and other current assets:    
Prepaid expenses $ 1,317 $ 2,430
Prepaid income taxes and income tax refunds 192 349
Other 2,021 2,436
Prepaid expenses and other current assets 3,530 5,215
Other long-term assets, net:    
Spare parts, net 10,753 9,147
Right of use assets, operating leases, net 9,331 10,592
Intangible assets, net 7,644 7,899
Mine development costs, net 7,125 7,377
Upfront Customer Consideration 5,586 5,967
Mine reclamation asset, net 1,856 1,955
Other 2,546 2,663
Total other long-term assets, net $ 44,841 $ 45,600
Term of contract 15 years