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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
   December 31, 
   2019   2018 
Raw materials and component parts  $71,895   $67,508 
Finished goods   95,914    94,270 
   $167,809   $161,778