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SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS - Activity Related to Preferred Units (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 12, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]      
Beginning balance $ 555,599    
Ending balance 592,625    
Embedded derivative liability 175,498 $ 102,929 $ 94,459
Redeemable noncontrolling interest, including embedded derivative liability 768,123    
Preferred Units, redemption price $ 700,800    
Preferred Units, redemption terms, internal rate of return 11.50%    
Preferred Unit limited partners      
Movement In Preferred Units [Roll Forward]      
Redeemable noncontrolling interest - Preferred Units: beginning of period (in shares) 638,163,000    
Distribution of in-kind additional Preferred Units (in shares) 22,531,000    
Redeemable noncontrolling interest - Preferred Units: end of period (in shares) 660,694,000    
Increase (Decrease) in Temporary Equity [Roll Forward]      
Allocation of Altus Midstream net income $ 37,026    
Ending balance $ 592,625