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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventories consist of the following at September 30, 2021 and December 31, 2020 (in thousands):
September 30, 2021December 31, 2020
Raw materials (1)$71,528 $99,495 
Work-in-process (1)103,316 98,753 
Finished goods (1)122,458 154,012 
Total$297,302 $352,260 
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(1)The components of inventory shown in the table above are net of allowance for obsolescence.