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Inventories, net
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories, net Inventories, net
Inventories, net are summarized as follows (in thousands):
 June 30, 2020December 31, 2019
Coal$123,243  $69,064  
Raw materials, parts, supplies and other, net30,662  28,837  
Total inventories, net$153,905  $97,901