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Receivables (Tables)
12 Months Ended
Dec. 31, 2011
Receivables  
Summary of receivables
 
  December 31, 2011   December 31, 2010  

Trade, net

  $ 221,343   $ 174,216  

Other

    5,218     4,993  
           

Total receivables

  $ 226,561   $ 179,209