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Inventories | 6 Months Ended
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Jun. 30, 2025
Business Combination [Abstract] |
Inventories | 5.INVENTORIES ​ Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ | ​ | 2025 |  | 2024 |
​ | ​ | (in thousands) | ​
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 | ​
​ | ​ | ​ | 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 | ​
​ The above balances reflect lower of cost or net realizable value adjustments to our coal inventories of $2.7 million and $24.6 million as of June 30, 2025 and December 31, 2024, respectively. The adjustment as of June 30, 2025 is primarily a result of higher cost per ton at the MC Mining, LLC (“MC Mining”) mining complex as a result of lower production. The adjustment as of December 31, 2024 is the result of lower coal sale prices and higher cost per ton primarily due to a longwall move at the Hamilton mining complex, lower production at Mettiki Coal, LLC and Mettiki Coal (WV), LLC (collectively “Mettiki”) and MC Mining mining complexes, and ongoing development activities at the Henderson County mine at our River View Coal, LLC (“River View”) mining complex.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/330/tableOfContent + Details
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