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Inventories
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories at the dates indicated consisted of the following: 
 
At September 30,
 
At December 31,
(in thousands)
2018
 
2017
 
2017
Raw materials
$
114,075

 
$
87,100

 
$
91,022

In-process products
28,251

 
26,248

 
26,849

Finished products
137,177

 
131,128

 
135,125

 
$
279,503

 
$
244,476

 
$
252,996