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STOCK-BASED COMPENSATION - Compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
STOCK-BASED COMPENSATION        
Pre - tax cost $ 571 $ 581 $ 1,124 $ 1,157
After tax cost $ 446 $ 453 $ 877 $ 902