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Inventories, net (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net
Inventories, net are summarized as follows (in thousands):
 June 30, 2021December 31, 2020
Coal$38,168 $86,272 
Raw materials, parts, supplies and other, net38,796 32,441 
Total inventories, net$76,964 $118,713