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Inventories, Net (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Components of inventory
The components of inventories are as follows (in thousands):
 
June 30,
2018
 
December 31,
2017
Finished goods
$
84,594

 
$
79,226

Work in process
15,053

 
15,447

Raw materials and supplies
91,394

 
88,895

Inventories, net 
$
191,041

 
$
183,568