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SUBSEQUENT EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Aug. 17, 2022
Aug. 12, 2022
Jul. 27, 2022
Jul. 20, 2022
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Apr. 19, 2022
Sep. 30, 2020
Subsequent Event [Line Items]                      
Partners share targeted year-to-date distribution amount (usd per share)         $ 0.1235 $ 0.1235 $ 0.116 $ 0.1135      
Targeted annual distribution amount (usd per share)                 $ 1.15    
Swap maturing August 2025                      
Subsequent Event [Line Items]                      
Notional                   $ 175.0 $ 150.0
Derivative, fixed interest rate                   1.57% 0.84%
Subsequent Event                      
Subsequent Event [Line Items]                      
Partners share targeted year-to-date distribution amount (usd per share)       $ 0.1235              
Subsequent Event | Swap maturing August 2025                      
Subsequent Event [Line Items]                      
Proceeds from terminated and settled interest rate swap     $ 7.7                
Term of agreement 5 years                    
Notional $ 175.0                    
Derivative, fixed interest rate 2.686%                    
Subsequent Event | Common Units                      
Subsequent Event [Line Items]                      
Targeted annual distribution amount (usd per share)       $ 0.494              
Distributions, limited partner   $ 2.0                  
Subsequent Event | Common Units and Subordinated Units | USDG                      
Subsequent Event [Line Items]                      
Distributions, limited partner   $ 2.1