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SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS - Schedule of Preferred Units (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 12, 2019
Nov. 09, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]          
Redeemable noncontrolling interest — Preferred Unit limited partners $ 516,790   $ 555,599 $ 0  
Transaction price, net   $ 628,154 0 628,154 $ 0
Long-term liability: Embedded derivative 94,459   $ 102,929 $ 0  
Transaction price,net 611,249        
Preferred Unit limited partners          
Class of Stock [Line Items]          
Transaction price, gross 625,000        
Issue discount (3,675)        
Transaction costs to other third parties (10,076)        
Transaction price, net $ 611,249