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Inventories (Tables)
6 Months Ended
Jun. 30, 2013
Inventory Disclosure [Abstract]  
Disclosure of inventories
Inventories consist of the following:
 
 
 
June 30, 2013
 
December 31, 2012
 
 
 
 
 
Parts and work-in-process
 
$
25,804

 
$
27,355

Finished goods
 
41,558

 
43,900

Inventory
 
$
67,362

 
$
71,255