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Inventories (Tables)
 3 Months Ended
Jun. 30, 2020
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)
2020
 
2019
 
2019
Raw materials
$
110,883

 
$
102,901

 
$
95,575

In-process products
18,661

 
25,145

 
23,672

Finished products
135,821

 
138,096

 
132,660

 
$
265,365

 
$
266,142

 
$
251,907