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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories

The components of inventories consist of the following: 

 

    March 31,
2018
    December 30,
2017
 
             
Raw materials   $ 190,213     $ 179,659  
Work-in-process     84,431       75,754  
Finished goods     272,768       262,231  
Inventory, net of reserves   $ 547,412     $ 517,644