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STOCK-BASED COMPENSATION - Compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
STOCK-BASED COMPENSATION        
Pre - tax cost $ 572 $ 1,500 $ 1,696 $ 2,657
After tax cost $ 446 $ 1,170 $ 1,323 $ 2,072