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STOCK-BASED COMPENSATION - Summary of stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
STOCK-BASED COMPENSATION        
Pre - tax cost $ 528 $ 874 $ 1,572 $ 2,235
After tax cost $ 412 $ 563 $ 1,226 $ 1,441