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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Future minimum lease payments under operating leases
      September 30,  

2012

  $ 6,419  

2013

    7,090  

2014

    6,651  

2015

    6,775  

2016

    6,080  

Thereafter

    22,085  
   

 

 

 

Total minimum payments

  $ 55,100