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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following: 
 
June 30, 2019
 
December 31, 2018
Raw materials
$
67,574

 
$
66,965

Work in process
12,347

 
12,333

Finished goods
12,992

 
13,061

 
$
92,913

 
$
92,359