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CONSOLIDATED BALANCE SHEETS (Parenthetical)
Mar. 31, 2013
Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS    
Common unitholders, units issued 27,430,563 27,430,563
Common unitholders, units outstanding 27,393,786 27,310,648
General partner interest (as a percent) 0.83% 0.83%
General partner interest, equivalent units outstanding 230,303 230,303