STOCK-BASED COMPENSATION PLANS - Summary of stock-based compensation expense (benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
STOCK-BASED COMPENSATION PLANS
Total stock-based compensation expense	$ 444	$ 611	$ 1,270	$ 1,516
Restricted stock units
STOCK-BASED COMPENSATION PLANS
Total stock-based compensation expense	263	313	798	907
Performance restricted stock units
STOCK-BASED COMPENSATION PLANS
Total stock-based compensation expense	117	295	467	652
Total awards classified as equity
STOCK-BASED COMPENSATION PLANS
Total stock-based compensation expense	380	608	1,265	1,559
Stock appreciation rights
STOCK-BASED COMPENSATION PLANS
Total stock-based compensation expense	$ 64	$ 3	$ 5	$ (43)