XML 75 R63.htm IDEA: XBRL DOCUMENT v3.23.1
COMMON UNIT-BASED COMPENSATION PLANS - SERP and Directors (Details) - SERP and Deferred Compensation Plans - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Other information      
Unit-based compensation expense $ 600 $ 200  
Total unit-based obligation recorded $ 15,600    
Phantom Share Units (PSUs)      
Number of units      
Balance at the beginning of the period (in units) 742,540    
Granted (in units) 23,980    
Balance at the end of the period (in units) 766,520    
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) 21.30    
Balance at the end of the period (in dollars per unit) $ 20.31    
Intrinsic value (in dollars)      
Intrinsic value of outstanding grants (in dollars) $ 15,461   $ 15,088