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STOCK-BASED COMPENSATION - Summary of stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
STOCK-BASED COMPENSATION        
Pre - tax cost $ 528 $ 853 $ 1,044 $ 1,361
After tax cost $ 411 $ 550 $ 814 $ 878