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Inventories (Tables)
3 Months Ended
Mar. 31, 2013
Inventory Disclosure [Abstract]  
Disclosure of inventories
Inventories consist of the following:
 
 
March 31, 2013
 
December 31, 2012
Parts and work-in-process
 
$
28,751

 
$
27,355

Finished goods
 
42,029

 
43,900

Inventory
 
$
70,780

 
$
71,255