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Inventory
3 Months Ended
Mar. 31, 2012
Inventory [Abstract]  
Inventory

4. Inventory

Inventory at December 31, 2011 and March 31, 2012 was as follows (in thousands):

    December 31,    
    2011   March 31, 2012
Refined petroleum products $ 127,999 $ 117,865
Natural gas liquids   55,490   46,691
Transmix   60,251   55,968
Crude oil   8,065   12,064
Additives   7,055   7,579
Total inventory $ 258,860 $ 240,167