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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventories [Abstract]  
Inventories Inventories consist of the following:


 
June 30,
2019
   
December 31,
2018
 
Raw materials and parts
 
$
176,938
   
$
173,919
 
Work-in-process
   
73,629
     
69,718
 
Finished goods
   
82,594
     
89,152
 
Used equipment
   
27,722
     
23,155
 
Total
 
$
360,883
   
$
355,944