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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of components of inventories
The components of inventories consisted of the following:

 
December 31,
 (in thousands) 
2017
 
2016
Raw materials
$
91,022

 
$
86,524

In-process products
26,849

 
20,902

Finished products
135,125

 
124,848

 
$
252,996

 
$
232,274