v3.10.0.1
PARTNERS' EQUITY Table 5 - Cash Distributions - Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Series A Preferred Limited Partner [Member]        
Distribution Made to Limited Partner [Line Items]        
Preferred units distribution percentage       8.50%
Preferred unit distribution paid   $ 0.53125 $ 0.53125  
Cash distributions applicable to preferred limited partners   $ 4,813 $ 4,813  
Distribution date of record   Jun. 01, 2018 Mar. 01, 2018  
Distribution payment date   Jun. 15, 2018 Mar. 15, 2018  
Series B Preferred Limited Partner [Member]        
Distribution Made to Limited Partner [Line Items]        
Preferred units distribution percentage       7.625%
Preferred unit distribution paid   $ 0.47657 $ 0.47657  
Cash distributions applicable to preferred limited partners   $ 7,339 $ 7,339  
Distribution date of record   Jun. 01, 2018 Mar. 01, 2018  
Distribution payment date   Jun. 15, 2018 Mar. 15, 2018  
Series C Preferred Limited Partner [Member]        
Distribution Made to Limited Partner [Line Items]        
Preferred units distribution percentage       9.00%
Preferred unit distribution paid   $ 0.5625 $ 0.65625  
Cash distributions applicable to preferred limited partners   $ 3,881 $ 4,528  
Distribution date of record   Jun. 01, 2018 Mar. 01, 2018  
Distribution payment date   Jun. 15, 2018 Mar. 15, 2018  
Subsequent Event [Member] | Series A Preferred Limited Partner [Member]        
Distribution Made to Limited Partner [Line Items]        
Preferred unit distribution declared $ 0.53125      
Cash distributions applicable to preferred limited partners $ 4,813      
Distribution date of record Sep. 04, 2018      
Distribution payment date Sep. 17, 2018      
Subsequent Event [Member] | Series B Preferred Limited Partner [Member]        
Distribution Made to Limited Partner [Line Items]        
Preferred unit distribution declared $ 0.47657      
Cash distributions applicable to preferred limited partners $ 7,339      
Distribution date of record Sep. 04, 2018      
Distribution payment date Sep. 17, 2018      
Subsequent Event [Member] | Series C Preferred Limited Partner [Member]        
Distribution Made to Limited Partner [Line Items]        
Preferred unit distribution declared $ 0.5625      
Cash distributions applicable to preferred limited partners $ 3,881      
Distribution date of record Sep. 04, 2018      
Distribution payment date Sep. 17, 2018