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PARTNERS' EQUITY Table 2 - Cash Distributions Declared - Common Limited Partners (Details) - Common Limited Partner [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Distribution Made to Common Limited Partners [Line Items]    
Cash distributions per unit $ 0.40 $ 0.40
Cash distributions applicable to common unitholders $ 43,834 $ 43,787
Distribution date of record May 10, 2021 Feb. 08, 2021
Distribution payment date May 14, 2021 Feb. 12, 2021