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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of components of inventories
The components of inventories consisted of the following:
 

 
December 31,
 (in thousands) 
2016
 
2015
Raw materials
$
86,524

 
$
75,950

In-process products
20,902

 
18,828

Finished products
124,848

 
100,979

 
$
232,274

 
$
195,757