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Receivables (Tables)
12 Months Ended
Dec. 31, 2011
Receivables  
Schedule of receivables

 

 

 
  December 31,  
 
  2011   2010  

Trade receivables

  $ 233,568   $ 130,904  

Other receivables

    86,493     14,856  

Less: Allowance for losses

    (6,718 )   (2,522 )
           

Receivables, net

  $ 313,343   $ 143,238