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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventories

Inventories consist of the following:

 

(In thousands)   September 30,
2018
    December 31,
2017
 
             
Raw materials and component parts   $ 60,253     $ 46,884  
Finished goods     101,206       90,174  
                 
    $ 161,459     $ 137,058