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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Number of units          
Balance at the beginning of the period (in units)     811,946    
Granted (in units)     79,695    
Settled (in units)     (96,873)    
Balance at the end of the period (in units) 794,768   794,768    
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)     21.85    
Settled (in dollars per unit)     23.89    
Balance at the end of the period (in dollars per unit) $ 20.78   $ 20.78    
Intrinsic value (in dollars)          
Intrinsic value of outstanding grants (in dollars) $ 19,869   $ 19,869   $ 17,197
Other information          
Purchased for awards (in shares)     54,152    
Unit-based compensation expense 700 $ 600 $ 2,000 $ 1,800  
Total unit-based obligation recorded $ 16,500   $ 16,500