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Partners' Capital (Tables)
12 Months Ended
Dec. 31, 2011
Partners' Capital [Abstract]  
Limited Partner Units
Limited Partner Units
 
As of December 31, 2011 and 2010, our partners' capital included the following limited partner units:
 
 
December 31,
 
2011
 
2010
Common units
232,677,222
 
218,880,103
Class B units
5,313,400
 
5,313,400
i-units
98,509,389
 
91,907,987
Total limited partner units
336,500,011
 
316,101,490