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

Inventories consist of the following:

 

(In thousands)   June 30,
2018
    December 31, 2017  
             
Raw materials and component parts   $ 69,077     $ 46,884  
Finished goods     100,246       90,174  
                 
    $ 169,323     $ 137,058