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COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors (Details) - SERP and Deferred Compensation Plans - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Number of units        
Balance at the beginning of the period (in units) 742,540 668,698 760,630  
Granted (in units) 118,737 73,842 46,638  
Settled (in units) (49,331)   (138,570)  
Balance at the end of the period (in units) 811,946 742,540 668,698  
Weighted average grant date fair value per unit        
Balance at the beginning of the period (in dollars per unit) $ 20.28 $ 20.37 $ 22.04  
Granted (in dollars per unit) 20.46 19.44 9.45  
Settled (in dollars per unit) 20.27   25.86  
Balance at the end of the period (in dollars per unit) $ 20.44 $ 20.28 $ 20.37  
Intrinsic value (in dollars)        
Intrinsic value of outstanding grants (in dollars) $ 17,197 $ 15,088 $ 8,452 $ 3,408
Other information        
Purchased for awards (in shares) 27,576   102,962  
Unit-based compensation expense $ 2,400 1,400 $ 400  
Total unit-based obligation recorded $ 16,600 $ 15,100