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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following: 
 
June 30, 2017
 
December 31, 2016
Raw materials
$
54,440

 
$
46,352

Work in process
11,709

 
11,234

Finished goods
14,553

 
13,468

 
$
80,702

 
$
71,054