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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following: 
 
September 30, 2018
 
December 31, 2017
Raw materials
$
66,646

 
$
73,026

Work in process
12,612

 
10,136

Finished goods
13,937

 
15,853

 
$
93,195

 
$
99,015