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PARTNERS' EQUITY Table 1 - Changes to Partners' Equity, excluding the Carrying Value of the Series D Preferred Units (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Increase (Decrease) in Partners' Capital [Roll Forward]        
Balance as of January 1, 2018     $ 2,480,089  
Net income     189,608  
Unit-based compensation     6,559  
Other comprehensive income     23,204  
Distributions to partners     (284,605)  
Issuance of units, including contribution from general partner     10,204  
Adjustments related to the Merger (refer to Note 2 for discussion)     (67,972)  
Series D Preferred Unit accretion (refer to Note 11 for discussion) $ (4,031) $ 0 (4,031) $ 0
Other     (6,174)  
Balance as of September 30, 2018 $ 2,346,882   $ 2,346,882