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Inventories (Tables)
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Components of inventory
 
(in thousands)
 
 
March 31,
 
December 31,
 
 
2013
 
2012
 
Finished Goods
 
$
13,084
  
$
13,012
 
Work in process
  
503
   
352
 
Component parts
  
3,386
   
3,673
 
Service parts
  
8,862
   
9,135
 
 
 
$
25,835
  
$
26,172