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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following at December 31:
 
2017
 
2016
Raw materials
$
39,975

 
$
34,560

Work in process
3,523

 
3,775

Finished goods
92,049

 
107,073

Total
$
135,547

 
$
145,408