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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
INVENTORIES [Abstract]  
Schedule of Inventory, Current [Table Text Block]
 
2017
 
2016
Raw materials and parts
$
118,790

 
$
100,408

Work-in-progress
43,035

 
41,454

Finished goods
93,565

 
80,185

Total inventory
$
255,390

 
$
222,047