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STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expense (benefit) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
STOCK-BASED COMPENSATION PLANS        
Total stock-based compensation expense $ 446 $ 387 $ 826 $ 905
Restricted stock units        
STOCK-BASED COMPENSATION PLANS        
Total stock-based compensation expense 262 317 535 594
Performance restricted stock units        
STOCK-BASED COMPENSATION PLANS        
Total stock-based compensation expense 114 117 350 357
Total awards classified as equity        
STOCK-BASED COMPENSATION PLANS        
Total stock-based compensation expense 376 434 885 951
Stock appreciation rights        
STOCK-BASED COMPENSATION PLANS        
Total stock-based compensation expense $ 70 $ (47) $ (59) $ (46)