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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of units        
Balance at the beginning of the period (in units) 811,946 742,540 668,698  
Granted (in units) 100,757 118,737 73,842  
Settled (in units) (912,703) (49,331)    
Balance at the end of the period (in units)   811,946 742,540  
Weighted average grant date fair value per unit        
Balance at the beginning of the period (in dollars per unit) $ 20.44 $ 20.28 $ 20.37  
Granted (in dollars per unit) 22.85 20.46 19.44  
Settled (in dollars per unit) $ (26.37) 20.27    
Balance at the end of the period (in dollars per unit)   $ 20.44 $ 20.28  
Intrinsic value (in dollars)        
Intrinsic value of outstanding grants (in dollars)   $ 17,197 $ 15,088 $ 8,452
Other information        
Purchased for awards (in shares) 54,152 27,576    
Unit-based compensation expense $ 2,300 $ 2,400 $ 1,400  
Total unit-based obligation recorded   $ 16,600