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STOCK-BASED COMPENSATION - Compensation expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
STOCK-BASED COMPENSATION        
Pre - tax cost $ 544 $ 528 $ 1,626 $ 1,572
After tax cost $ 424 $ 412 $ 1,268 $ 1,226