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PARTNERS' EQUITY Table 3 - Cash Distributions Earned - 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
Distributions Made to Limited Partners and General Partner [Line Items]              
General partner interest $ 0       $ 2,302 $ 1,141 $ 6,947
General partner incentive distribution 0       10,912 0 34,736
Total general partner distribution 0       13,214 1,141 41,683
Common limited partners’ distribution 64,248       101,870 184,369 305,652
Total cash distributions $ 64,248 $ 64,205 $ 57,057 $ 115,267 $ 115,084 $ 185,510 $ 347,335
Common Limited Partner [Member]              
Distributions Made to Limited Partners and General Partner [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