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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories

4 Inventories

Inventories are classified as follows (in thousands):

 

     June 30, 2018      December 31, 2017  

Raw materials

   $ 107,688      $ 99,033  

Work in progress

     16,459        15,324  

Finished goods

     175,448        155,937  
  

 

 

    

 

 

 

Total inventories

   $ 299,595      $ 270,294