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Inventories (Tables)
3 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of carrying values of inventories
Inventories at the dates indicated consisted of the following: 
 At June 30,At December 31,
(in thousands)
202120202020
Raw materials
$101,163 $110,883 $95,777 
In-process products
24,117 18,661 21,803 
Finished products
184,974 135,821 166,162 
 $310,254 $265,365 $283,742