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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following: 
 
September 30, 2019
 
December 31, 2018
Raw materials
$
64,344

 
$
66,965

Work in process
12,916

 
12,333

Finished goods
12,926

 
13,061

 
$
90,186

 
$
92,359