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Inventories, Net (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventories are as follows (in thousands):
 
September 30,
2017
 
December 31,
2016
Finished goods
$
73,046

 
$
73,027

Work in process
16,041

 
14,719

Raw materials and supplies
93,401

 
87,047

Inventories, net 
$
182,488

 
$
174,793