v3.20.1
PARTNERS' EQUITY Table 1 - Cash Distributions - Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Series A Preferred Limited Partner [Member]    
Distribution Made to Preferred Limited Partner [Line Items]    
Preferred units distribution percentage 8.50%  
Preferred unit distribution $ 0.53125  
Fixed distribution per quarter $ 4,813  
Series B Preferred Limited Partner [Member]    
Distribution Made to Preferred Limited Partner [Line Items]    
Preferred units distribution percentage 7.625%  
Preferred unit distribution $ 0.47657  
Fixed distribution per quarter $ 7,339  
Series C Preferred Limited Partner [Member]    
Distribution Made to Preferred Limited Partner [Line Items]    
Preferred units distribution percentage 9.00%  
Preferred unit distribution $ 0.56250  
Fixed distribution per quarter $ 3,881  
Preferred Limited Partner [Member]    
Distribution Made to Preferred Limited Partner [Line Items]    
Fixed distribution per quarter $ 16,033 $ 16,033