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STOCK PLANS (RSUs and PSUs) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Restricted Stock Units  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Balance at beginning of year (in shares) | shares 376,784
Shares granted | shares 145,245
Shares vested (in shares) | shares (71,845)
Shares forfeited | shares (31,218)
Balance at end of year (in shares) | shares 418,966
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Balance at beginning of year, weighted average grant date fair value (in dollars per share) | $ / shares $ 59.75
Shares granted, weighted average grant date fair value (in dollars per share) | $ / shares 85.69
Shares vested, weighted average grant date fair value (in dollars per share) | $ / shares 49.39
Shares forfeited, weighted average grant date fair value (in dollars per share) | $ / shares 66.68
Balance at end of year, weighted average grant date fair value (in dollars per share) | $ / shares $ 69.98
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Shares granted | shares 34,660
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Shares granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 70.09