v3.8.0.1
PARTNERS' EQUITY Table 7 - Cash Distributions - Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jan. 29, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Subsequent Event [Member]            
Distribution Made to Limited Partner [Line Items]            
Distribution announcement date, preferred units (distribution earned) Jan. 29, 2018          
Series A Preferred Limited Partner [Member]            
Distribution Made to Limited Partner [Line Items]            
Preferred unit distribution paid     $ 0.53125 $ 0.53125 $ 0.53125 $ 0.64930556
Cash distributions applicable to preferred limited partners     $ 4,813 $ 4,813 $ 4,813 $ 5,883
Distribution date of record     Dec. 01, 2017 Sep. 01, 2017 Jun. 01, 2017 Mar. 01, 2017
Distribution payment date     Dec. 15, 2017 Sep. 15, 2017 Jun. 15, 2017 Mar. 15, 2017
Series A Preferred Limited Partner [Member] | Subsequent Event [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   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 $ 0.725434028    
Cash distributions applicable to preferred limited partners     $ 7,339 $ 11,172    
Distribution date of record     Dec. 01, 2017 Sep. 01, 2017    
Distribution payment date     Dec. 15, 2017 Sep. 15, 2017    
Series B Preferred Limited Partner [Member] | Subsequent Event [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   Mar. 01, 2018        
Distribution payment date   Mar. 15, 2018        
Series C Preferred Limited Partner [Member] | Subsequent Event [Member]            
Distribution Made to Limited Partner [Line Items]            
Preferred unit distribution declared   $ 0.65625        
Cash distributions applicable to preferred limited partners   $ 4,528        
Distribution date of record   Mar. 01, 2018        
Distribution payment date   Mar. 15, 2018