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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories

Inventories consist of the following:

 

     Years Ended December 31,  
             2018                      2017          

Raw material

   $ 235,593      $ 191,351  

Work-in-process

     61,908        54,050  

Finished goods

     87,188        93,680  
  

 

 

    

 

 

 
   $ 384,689      $ 339,081