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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of components of inventories
The components of inventories consisted of the following:

 December 31,
 (in thousands) 
20202019
Raw materials$95,777 $95,575 
In-process products21,803 23,672 
Finished products166,162 132,660 
 $283,742 $251,907