v3.8.0.1
PARTNERS' EQUITY Table 5 - Cash Distributions - Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Series A Preferred Limited Partner [Member]    
Distribution Made to Limited Partner [Line Items]    
Preferred unit distribution paid   $ 0.53125
Cash distributions applicable to preferred limited partners   $ 4,813
Distribution date of record   Mar. 01, 2018
Distribution payment date   Mar. 15, 2018
Series B Preferred Limited Partner [Member]    
Distribution Made to Limited Partner [Line Items]    
Preferred unit distribution paid   $ 0.47657
Cash distributions applicable to preferred limited partners   $ 7,339
Distribution date of record   Mar. 01, 2018
Distribution payment date   Mar. 15, 2018
Series C Preferred Limited Partner [Member]    
Distribution Made to Limited Partner [Line Items]    
Preferred unit distribution paid   $ 0.65625
Cash distributions applicable to preferred limited partners   $ 4,528
Distribution date of record   Mar. 01, 2018
Distribution payment date   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 Jun. 01, 2018  
Distribution payment date Jun. 15, 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 Jun. 01, 2018  
Distribution payment date Jun. 15, 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 Jun. 01, 2018  
Distribution payment date Jun. 15, 2018