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Inventories, net
 12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories, net
Inventories, net
Inventories, net are summarized as follows (in thousands):
 
 
Successor
 
December 31, 2018
 
December 31, 2017
Coal
$
32,854

 
$
32,422

Raw materials, parts, supplies and other, net
23,865

 
21,872

Total inventories, net
$
56,719

 
$
54,294