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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
(In thousands)  June 30,
2020
   December 31, 2019 
         
Raw materials and component parts  $78,954   $71,895 
Finished goods   115,877    95,914 
           
   $194,831   $167,809