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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, 2020
Dec. 31, 2019
Distribution Made to Common Limited Partners [Line Items]    
Cash distributions per unit $ 0.40 $ 0.60
Cash distributions applicable to common unitholders (distribution earned) $ 43,730 $ 65,128
Distribution date of record (distribution earned) May 11, 2020 Feb. 10, 2020
Distribution payment date (distribution earned) May 15, 2020 Feb. 14, 2020