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COMMON UNITS - Per share distributions to common and subordinated unitholders (Details) - Common units - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Class of Stock [Line Items]    
Distributions paid per common unit (in dollars per share) $ 0.2700 $ 0.1750
Distributions declared per common unit (in dollars per share) $ 0.2700 $ 0.1750