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Inventories
 3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories at the dates indicated consisted of the following: 
 At March 31,At December 31,
(in thousands)
202120202020
Raw materials
$94,340 $89,903 $95,777 
In-process products
22,678 19,464 21,803 
Finished products
179,622 146,353 166,162 
 $296,640 $255,720 $283,742