Annual report pursuant to Section 13 and 15(d)

INVENTORIES - Summary of Inventories (Details)

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INVENTORIES - Summary of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 66,487 $ 89,611
Work in process 562 387
Finished goods 44,650 31,131
Total inventories $ 111,699 $ 121,129