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INVENTORIES. (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories

   March 31, 2020   December 31, 2019 
Finished goods  $29,892   $38,194 
Work in progress   3,509    7,426 
Raw materials   6,457    7,890 
Low-carbon and RIN credits   4,274    5,690 
Other   1,400    1,400 
Total  $45,532   $60,600