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Inventories
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories

8. Inventories

Inventories at September 30, 2018 and December 31, 2017 consisted of the following:

 

 

 

September 30, 2018

 

 

December 31, 2017

 

Raw materials

 

$

55,317

 

 

$

49,351

 

Work in process

 

 

20,310

 

 

 

22,914

 

Finished goods

 

 

81,422

 

 

 

73,346

 

 

 

$

157,049

 

 

$

145,611