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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Number of units          
Balance at the beginning of the period (in units)     742,540    
Granted (in units)     75,648    
Settled (in units)     (49,331)    
Balance at the end of the period (in units) 768,857   768,857    
Weighted average grant date fair value per unit          
Balance at the beginning of the period (in dollars per unit)     $ 20.28    
Granted (in dollars per unit)     19.75    
Settled (in dollars per unit)     20.27    
Balance at the end of the period (in dollars per unit) $ 20.36   $ 20.36    
Intrinsic value (in dollars)          
Intrinsic value of outstanding grants (in dollars) $ 17,322   $ 17,322   $ 15,088
Other information          
Purchased for awards (in shares)     27,576    
Unit-based compensation expense 600 $ 400 $ 1,800 $ 900  
Total unit-based obligation recorded $ 15,700   $ 15,700