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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
INVENTORIES [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
2018
 
2017
Raw materials and parts
$
122,945

 
$
118,790

Work-in-progress
47,098

 
43,035

Finished goods
98,778

 
93,565

Total inventory
$
268,821

 
$
255,390