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Inventories, Net
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories, Net Inventories, net
Inventories, net consisted of the following: 
 June 30, 2020December 31, 2019
Raw coal$25,962  $30,274  
Saleable coal90,572  105,092  
Materials, supplies and other, net (1)
26,664  27,293  
Total inventories, net$143,198  $162,659  
(1) Includes an increase in allowance for obsolete material and supplies inventory of $807 recorded as restructuring expense during the three months ended June 30, 2020 (refer to Note 8).