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Partners' Capital - Partnership Units (Table) (Details)
Jun. 30, 2012
Apr. 24, 2012
Jan. 23, 2012
Dec. 31, 2011
Apr. 21, 2011
Jan. 21, 2011
Partners' Capital (Abstract)            
Limited partner units 69,372,077 69,372,077 69,372,077 69,372,077 37,946,183 37,946,183
General partner units 1,415,757     1,415,757    
Preferred partner units 15,555,554     0    
Total partnership units 86,343,388     70,787,834