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Inventories (Tables)
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventories consist of the following at September 30, 2020 and December 31, 2019 (in thousands):
September 30, 2020December 31, 2019
Raw materials (1)$108,961 $124,171 
Work-in-process (1)75,913 65,392 
Finished goods (1)170,029 138,302 
Total$354,903 $327,865 
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(1)The components of inventory shown in the table above are net of allowance for obsolescence.