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Inventories, net (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net
Inventories, net are summarized as follows (in thousands):
 September 30, 2020December 31, 2019
Coal$126,169 $69,064 
Raw materials, parts, supplies and other, net29,498 28,837 
Total inventories, net$155,667 $97,901