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Acquisition of Patroklos (M/V Cape Agamemnon) - Pro Forma Financial Information (Table) (Details) (Patroklos Marine Corporation, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Patroklos Marine Corporation
    
Business Acquisition [Line Items]    
Total revenues $ 134,473 $ 128,671
Partnership's net income 72,807 35,819
General Partner's interest in Partnership's net income 1,456 716
Limited Partners' interest in Partnership's net income $ 71,351 $ 35,103
Pro-forma weighted average of Partnership's common units outstanding 50,314,281 35,491,287
Net income per common unit (basic and diluted) $ 1.39 $ 0.98