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Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of carrying values of inventories
Inventories at the dates indicated consisted of the following: 
 
At September 30,
 
At December 31,
(in thousands)
2017
 
2016
 
2016
Raw materials
$
87,100

 
$
83,613

 
$
86,524

In-process products
26,248

 
20,313

 
20,902

Finished products
131,128

 
116,281

 
124,848

 
$
244,476

 
$
220,207

 
$
232,274