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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors (Details) - SERP and Deferred Compensation Plans - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Number of units          
Balance at the beginning of the period (in units)     811,946    
Granted (in units)     53,770    
Balance at the end of the period (in units) 865,716   865,716    
Weighted average grant date fair value per unit          
Balance at the beginning of the period (in dollars per unit)     $ 20.44    
Granted (in dollars per unit)     21.18    
Balance at the end of the period (in dollars per unit) $ 20.48   $ 20.48    
Intrinsic value (in dollars)          
Intrinsic value of outstanding grants (in dollars) $ 21,175   $ 21,175   $ 17,197
Other information          
Unit-based compensation expense 700 $ 600 1,300 $ 1,200  
Total unit-based obligation recorded $ 17,700   $ 17,700