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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
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Distribution Made to Common Limited Partners [Line Items]        
Cash distributions per unit $ 0.40 $ 0.40 $ 0.40 $ 0.40
Cash distributions applicable to common unitholders $ 43,814 $ 43,814 $ 43,834 $ 43,787
Distribution date of record Nov. 08, 2021 Aug. 06, 2021 May 10, 2021 Feb. 08, 2021
Distribution payment date Nov. 12, 2021 Aug. 12, 2021 May 14, 2021 Feb. 12, 2021