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Net (Loss) / Income Per Unit (Table) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net (Loss) / Income Per Unit (Abstract)      
Partnership's net (loss) / income $ (21,189) $ 87,120 $ 17,936
Less:      
Partnership's net income available to preferred unit holders 10,809 0 0
General Partners' interest in Partnership's net (loss) / income (640) 1,742 359
Partnership's net (loss) / income allocable to unvested units 0 1,571 147
Partnership's net (loss) / income available to common unit holders $ (31,358) $ 83,807 $ 17,430
Denominators      
Weighted average number of common units outstanding, basic and diluted 68,256,072 47,138,336 32,437,314
Net (loss) / income per common unit:      
Basic and diluted $ (0.46) $ 1.78 $ 0.54