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Net Income Per Unit (Table) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Net Income Per Unit [Abstract]    
Partnership's net income $ 26,975 $ 26,260
Less:    
Preferred unit holders' interest in Partnership's net income 5,550 5,628
General Partner's interest in Partnership's net income 426 411
Partnership's net income allocable to unvested units 148 0
Common unit holders' interest in Partnership's net income $ 20,851 $ 20,221
Denominators    
Weighted average number of common units outstanding, basic and diluted 119,559,456 110,427,242
Net income per common unit:    
Basic and diluted $ 0.17 $ 0.18