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STOCK-BASED COMPENSATION PLANS (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of stock options exercised $ 618 $ 455 $ 1,705
Cash received from stock option exercises 4,284 2,994 6,144
Income tax benefit from the exercise of stock options 188 178 665
Total fair value of stock options vested $ 892 $ 919 $ 925