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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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Distributions Made to Limited Partners and General Partner [Line Items]      
General partner interest $ 1,141   $ 2,343
General partner incentive distribution 0   12,912
Total general partner distribution 1,141   15,255
Common limited partners’ distribution 55,916   101,913
Total cash distributions applicable to common limited partners and general partner $ 57,057 $ 115,267 $ 117,168
Common Limited Partner [Member]      
Distributions Made to Limited Partners and General Partner [Line Items]      
Quarterly distribution annualized to common limited partners per unit $ 2.40    
Cash distributions per unit applicable to common limited partners $ 0.60 $ 1.095 $ 1.095