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Segment Information (Tables)
6 Months Ended
Jun. 30, 2011
Segment Information  
Supplemental Disclosure of Revenue by Service Type
   
Three Months Ended June 30,
 
Six Months Ended June 30,
 
   
2011
   
2010
 
2011
 
2010
 
Transaction services revenue
  $ 48,505     $ 26,851     $ 86,940     $ 49,721  
Subscription services revenue
    34,716       30,341       68,581       60,069  
Other
    5,830       4,715       10,721       8,902  
                                 
Total net revenue
  $ 89,051     $ 61,907     $ 166,242     $ 118,692