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Inventories, net (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net
Inventories, net are summarized as follows (in thousands):
 September 30, 2021December 31, 2020
Coal$53,161 $86,272 
Raw materials, parts, supplies and other, net40,865 32,441 
Total inventories, net$94,026 $118,713