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STOCK-BASED COMPENSATION - Summary of stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
STOCK-BASED COMPENSATION        
Pre - tax cost $ 487 $ 497 $ 1,655 $ 984
After tax cost $ 314 $ 320 $ 1,067 $ 634