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SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS - Schedule of Preferred Units (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 12, 2019
Nov. 09, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Class of Stock [Line Items]          
Transaction price, net   $ 628,200 $ 611,249 $ 0  
Redeemable noncontrolling interest — Preferred Unit limited partners $ 516,790   538,413   $ 0
Embedded derivative 94,459   $ 98,228   $ 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