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Inventories, Net (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventories are as follows (in thousands):
 
June 30,
2017
 
December 31,
2016
Finished goods
$
75,585

 
$
73,027

Work in process
12,677

 
14,719

Raw materials and supplies
93,287

 
87,047

Inventories, net 
$
181,549

 
$
174,793