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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors Comp (Details) - SERP and Deferred Compensation Plans - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Other information      
Unit-based compensation expense $ 200 $ 40  
Total unit-based obligation recorded $ 13,800    
Phantom Share Units (PSUs)      
Number of units      
Balance at the beginning of the period (in units) 668,698    
Granted (in units) 12,370    
Balance at the end of the period (in units) 681,068    
Weighted average grant date fair value per unit      
Balance at the beginning of the period (in dollars per unit) $ 20.37    
Granted (in dollars per unit) 13.61    
Balance at the end of the period (in dollars per unit) $ 20.25    
Intrinsic value of outstanding grants (in dollars) $ 10,509   $ 8,452