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Inventories (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Inventory [Line Items]    
Coal $ 55,171 $ 37,290
Finished goods (net of reserve for obsolescence of $2,366 and $2,481, respectively) 14,586 14,197
Work in process 1,778 1,560
Raw materials 6,975 7,192
Total operating inventories, net 78,510 60,239
Supplies (net of reserve for obsolescence of $7,152 and $6,409, respectively) 60,202 60,422
Total inventories, net 138,712 120,661
Reduce inventory carrying value to market 2,700 24,600
Manufactured goods    
Inventory [Line Items]    
Reserve for obsolescence 2,366 2,481
Supplies    
Inventory [Line Items]    
Reserve for obsolescence $ 7,152 $ 6,409