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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2011
Commitments and Contingencies [Abstract] 
Future minimum lease payments under operating leases
         
2011
  $ 1,181  
2012
    6,212  
2013
    6,804  
2014
    6,343  
2015
    6,457  
Thereafter
    27,727  
 
     
Total minimum payments
  $ 54,724