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Inventories (Tables)
6 Months Ended
Jun. 30, 2012
Inventory Disclosure [Abstract]  
Disclosure of inventories
Inventories consist of the following:
 
 
 
June 30, 2012
 
December 31, 2011
 
 
 
 
 
Parts and work-in-process
 
$
34,403

 
$
35,444

Finished goods
 
49,181

 
44,298

 
 
$
83,584

 
$
79,742