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Net Income Per Unit (Table) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Net Income Per Unit [Abstract]    
Partnership's net income $ 26,260 $ 19,058
Less:    
Partnership's net income available to preferred unit holders 5,628 8,004
General Partner's interest in Partnership's net income 411 216
Partnership's net income available to common unit holders $ 20,221 $ 10,838
Denominators    
Weighted average number of common units outstanding, basic and diluted 110,427,242 88,494,025
Net income per common unit:    
Basic and diluted $ 0.18 $ 0.12