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Inventories (Tables)
12 Months Ended
Dec. 31, 2011
Inventories  
Components of inventory
 
  December 31, 2011   December 31, 2010  

NGLs

  $ 32,352   $ 15,930  

Spare parts, materials and supplies

    8,654     7,502  
           

Total inventories

  $ 41,006   $ 23,432