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STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expense (benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
STOCK-BASED COMPENSATION PLANS      
Total stock-based compensation expense $ 2,048 $ 2,037 $ 990
Restricted stock units      
STOCK-BASED COMPENSATION PLANS      
Total stock-based compensation expense 1,204 1,334 579
Performance restricted stock units      
STOCK-BASED COMPENSATION PLANS      
Total stock-based compensation expense 749 615 185
Total awards classified as equity      
STOCK-BASED COMPENSATION PLANS      
Total stock-based compensation expense 1,953 1,949 764
Stock appreciation rights      
STOCK-BASED COMPENSATION PLANS      
Total stock-based compensation expense $ 95 $ 88 $ 226