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Inventories, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Inventory Disclosure [Abstract]      
Coal $ 96,311 $ 24,185  
Raw materials, parts, supplies and other, net 44,107 35,434  
Total inventories, net $ 140,418 $ 59,619 $ 140,418