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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories were comprised of the following as of June 30, 2017 and December 31, 2016:
 
June 30, 2017
 
December 31, 2016
Finished goods
$
51,328

 
$
43,511

Work in process
37,244

 
32,839

Raw materials and supplies
79,825

 
70,099

 
$
168,397

 
$
146,449