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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:

 

(In thousands)   June 30,
2017		     December 31, 2016  
             
Raw materials and component parts   $ 50,015     $ 36,821  
Finished goods     86,894       60,156  
                 
    $ 136,909     $ 96,977