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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following: 
 
June 30, 2018
 
December 31, 2017
Raw materials
$
65,359

 
$
73,026

Work in process
12,376

 
10,136

Finished goods
13,374

 
15,853

 
$
91,109

 
$
99,015