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PARTNERS' EQUITY Table 4 - Cash Distributions Earned - General and Common Limited Partners (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Distributions Made to Limited Partners and General Partner [Line Items]                        
Cash distributions to partners                      
General partner interest                   $ 0 1,141 $ 9,252
General partner incentive distribution                   0 0 45,669
Total general partner distributions                   0 1,141 54,921
Common limited partners' distribution                   259,136 248,705 407,681
Total cash distributions applicable to common unitbolders and general partner (distribution earned)                   259,136 249,846 462,602
Common Limited Partner [Member]                        
Distributions Made to Limited Partners and General Partner [Line Items]                        
Cash distributions to partners                   $ 258,354 $ 286,398 $ 391,737
Cash distributions per unit applicable to limited partners $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60 $ 0.60   $ 2.40 $ 2.40 $ 4.38
General Partner [Member]                        
Distributions Made to Limited Partners and General Partner [Line Items]                        
Cash distributions to partners                 $ 0   $ 14,379 $ 54,569