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INVENTORIES | 6 Months Ended
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Jun. 30, 2020
INVENTORIES |
INVENTORIES | 7.INVENTORIES ​ Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ | ​ | 2020 |  | 2019 |
​ | ​ | (in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Coal | ​ | $ | 51,418 | ​ | $ | 63,645 | ​
Supplies (net of reserve for obsolescence of $5,762 and $5,555, respectively) | ​ |  | 36,975 | ​ |  | 37,660 | ​
Total inventories, net | ​ | $ | 88,393 | ​ | $ | 101,305 | ​
​ During the six months ended June 30, 2020, we recorded lower of cost or net realizable value adjustments of $16.9 million to our coal inventories as a result of lower coal sale prices and higher cost per ton due to the impact of lower production on our fixed costs per ton in addition to the impact of challenging market conditions on our production levels. The lower of cost or net realizable value adjustments reflect the impacts of the challenging market conditions and were primarily attributable to the Hamilton and MC Mining complexes.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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