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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Other information          
Unit-based compensation expense $ 300 $ 100 $ 600 $ 200  
Total unit-based obligation recorded $ 14,000   $ 14,000    
Phantom Share Units (PSUs)          
Number of units          
Balance at the beginning of the period (in units)     668,698    
Granted (in units)     25,359    
Balance at the end of the period (in units) 694,057   694,057    
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)     15.80    
Balance at the end of the period (in dollars per unit) $ 20.20   $ 20.20    
Intrinsic value of outstanding grants (in dollars) $ 12,653   $ 12,653   $ 8,452