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STOCK-BASED COMPENSATION - Summary of stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
STOCK-BASED COMPENSATION        
Pre - tax cost $ 874 $ 487 $ 2,235 $ 2,142
After tax cost $ 563 $ 314 $ 1,441 $ 1,381