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STOCK-BASED COMPENSATION - Summary of stock-based compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
STOCK-BASED COMPENSATION        
Pre - tax cost $ 497 $ 459 $ 984 $ 904
After tax cost $ 320 $ 296 $ 634 $ 582