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Inventories
12 Months Ended
Dec. 31, 2017
Inventories [Abstract]  
Inventories
2. Inventories

Inventories consist of the following:

  
December 31
 
  
2017
  
2016
 
Raw materials and parts
 
$
146,144
  
$
137,763
 
Work-in-process
  
129,441
   
115,613
 
Finished goods
  
94,571
   
84,898
 
Used equipment
  
21,223
   
22,130
 
Total
 
$
391,379
  
$
360,404