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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Grants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Number of units    
Balance at the beginning of the period (in units) 1,430,489  
Granted (in units) 1,818,190  
Forfeited (in units) (69,933)  
Balance at the end of the period (in units) 3,178,746  
Weighted average grant date fair value per unit    
Balance at the beginning of the period (in dollars per unit) $ 5.02  
Granted (in dollars per unit) 6.03  
Forfeited (in dollars per unit) 5.46  
Balance at the end of the period (in dollars per unit) $ 5.59  
Intrinsic value (in dollars)    
Intrinsic value of outstanding grants (in dollars) $ 34,553 $ 6,409
$2.53 minimum-value guarantee    
Other information    
Guaranteed minimum (in shares) 921,430  
Guaranteed minimum (in dollars per unit) $ 2.53  
$3.79 minimum-value guarantee    
Other information    
Guaranteed minimum (in shares) 896,760  
Guaranteed minimum (in dollars per unit) $ 3.79