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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
 
Inventories consist of the following at December 31:
 
 
2017
 
2016
Raw materials
$
41,844

 
$
42,821

Work in process
14,666

 
13,315

Finished goods
84,926

 
79,733

 
$
141,436

 
$
135,869