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Acquisitions (Pro Forma Results Of Operations) (Details) (Southern Union Merger [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Southern Union Merger [Member]
   
Significant Acquisitions [Line Items]    
Revenues $ 2,322,780 $ 2,735,942
Net income 969,641 218,699
Net income attributable to partners $ 173,070 $ 99,571
Basic net income per Limited Partner unit $ 0.61 $ 0.35
Diluted net income per Limited Partner unit $ 0.61 $ 0.35