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Inventories, net (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories, Net
Inventories, net are summarized as follows (in thousands):
 
March 31, 2020
 
December 31, 2019
Coal
$
87,684

 
$
69,064

Raw materials, parts, supplies and other, net
29,879

 
28,837

Total inventories, net
$
117,563

 
$
97,901