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Inventories (Tables)
6 Months Ended
Jun. 30, 2016
Inventories [Abstract]  
Components of inventory
The components of inventories, net consist of the following:

  
(in thousands)
 
  
June 30,
2016
  
December 31,
2015
 
Finished goods
 
$
10,642
  
$
8,914
 
Work in process
  
411
   
263
 
Component parts
  
7,901
   
5,068
 
Service parts
  
6,438
   
7,254
 
  
$
25,392
  
$
21,499