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Deferred Revenue (Tables)
6 Months Ended
Jun. 30, 2012
Deferred Revenue [Abstract]  
Deferred revenue
                 
    June 30,
2012
    December 31,
2011
 

Licenses

  $ 12,933     $ 20,608  

Maintenance and services

    35,861       36,528  
   

 

 

   

 

 

 
    $ 48,794     $ 57,136  
   

 

 

   

 

 

 
     

Current portion

  $ 46,816     $ 55,372  

Non-current portion

    1,978       1,764  
   

 

 

   

 

 

 
    $ 48,794     $ 57,136