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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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Distribution Made to General and Common Limited Partners [Line Items]      
Cash distributions applicable to common limited partners and general partner (distribution earned) $ 57,057 $ 115,267 $ 117,168
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 $ 1.095 $ 1.095
Distribution date of record (distribution earned) May 08, 2018 Feb. 08, 2018  
Distribution payment date (distribution earned) May 14, 2018 Feb. 13, 2018