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Acquisitions (Schedule Of Pro Forma Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pro forma earnings data:      
Equity in earnings of equity investees     $ 15,322
Net income     (55,001)
Basic and diluted earnings per unit:      
Basic and Diluted $ 1.23 $ 0.75 $ 0.49
Pro forma net income per unit     $ 0.30
As reported units outstanding 78,363 67,938 40,560
Pro forma units outstanding     44,969
Gulf Of Mexico Crude Oil Pipeline Systems [Member]
     
Pro forma earnings data:      
Revenues   3,096,693  
Equity in earnings of equity investees   14,770  
Net income   $ 58,349  
Basic and diluted earnings per unit:      
Basic and Diluted   $ 0.75  
Pro forma net income per unit   $ 0.86  
As reported units outstanding   67,938  
Pro forma units outstanding   67,938