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Net Income Per Unit (Table) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Net Income Per Unit (Abstract)    
Partnership's net income $ 6,595 $ 17,541
Less:    
Partnership's net income available to preferred unit holders 4,159 0
General Partner's interest in Partnership's net income 49 351
Partnership's net income allocable to unvested units 41 353
Partnership's net income available to common unit holders $ 2,346 $ 16,837
Denominators    
Weighted average number of common units outstanding, basic and diluted 68,186,476 37,958,265
Net income per common unit:    
Basic and diluted $ 0.03 $ 0.44