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Inventories (Tables)
9 Months Ended
Sep. 30, 2012
Inventory Disclosure [Abstract]  
Disclosure of inventories
Inventories consist of the following:
 
 
September 30, 2012
 
December 31, 2011
Parts and work-in-process
 
$
32,227

 
$
35,444

Finished goods
 
55,565

 
44,298

 
 
$
87,792

 
$
79,742