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Deferred Revenue and Customer Advances
 6 Months Ended
Jun. 30, 2013
Deferred Revenue and Customer Advances

F. Deferred Revenue and Customer Advances

Deferred revenue and customer advances consist of the following and are included in short- and long-term deferred revenue and customer advances.

 

     June 30,
2013		      December 31,
2012		  
     (in thousands)  

Maintenance, training and extended warranty

    $ 56,499       $ 51,198   

Customer advances

      29,025         39,613   

Undelivered elements

      8,970         6,773   
  

 

 

     

 

 

  

Total deferred revenue and customer advances

    $ 94,494       $ 97,584