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Net Income Per Unit Basic (Table) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Net Income Per Unit (Abstract)    
Partnership's net income $ 64,332 $ 6,595
Less:    
Partnership's net income available to preferred unit holders 10,540 4,159
General Partner's interest in Partnership's net income 1,076 49
Denominators    
Weighted average number of common units outstanding, basic 68,385,001 68,186,476
Net income per common unit    
Basic $ 0.76 $ 0.03
Basic [Member]
    
Net Income Per Unit (Abstract)    
Partnership's net income 64,332 6,595
Less:    
Partnership's net income available to preferred unit holders 10,540 4,159
General Partner's interest in Partnership's net income 1,076 49
Partnership's net income allocable to unvested units 750 41
Partnership's net income available to common unit holders $ 51,966 $ 2,346
Denominators    
Weighted average number of common units outstanding, basic 68,385,001 68,186,476
Net income per common unit    
Basic $ 0.76 $ 0.03