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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories by major category are as follows (in thousands):
 
 
 
September 30,
2017
 
December 31,
2016
Raw materials
 
$
34,798

 
$
27,616

Work in process
 
11,966

 
11,864

Finished goods
 
44,606

 
41,287

 
 
$
91,370

 
$
80,767