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Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Inventories [Abstract]  
Components of inventory
 
December 31,
 
 
(in thousands)
 
 
2012
 
2011
 
Finished Goods
 
$
13,012
  
$
9,325
 
Work in process
  
352
   
1,007
 
Component parts
  
3,673
   
3,778
 
Service parts
  
9,135
   
11,150
 
 
 
$
26,172
  
$
25,260