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PARTNERS' EQUITY Table 4 - Cash Distributions Paid - General and Common Limited Partners (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Distribution Made to General and Common Limited Partners [Line Items]              
Cash distributions applicable to common limited partners and general partner (distribution earned) $ 64,248 $ 64,205 $ 57,057 $ 115,267 $ 115,084 $ 185,510 $ 347,335
Common Limited Partner [Member]              
Distribution Made to General and Common Limited Partners [Line Items]              
Cash distributions per unit applicable to common limited partners $ 0.60 $ 0.60 $ 0.60 $ 1.095 $ 1.095 $ 1.80 $ 3.285
Distribution date of record (distribution earned) Nov. 08, 2018 Aug. 07, 2018 May 08, 2018 Feb. 08, 2018      
Distribution payment date (distribution earned) Nov. 14, 2018 Aug. 13, 2018 May 14, 2018 Feb. 13, 2018