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STOCK-BASED COMPENSATION PLANS (Details 3)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number of Options Outstanding | shares 1,502,493
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 3 years 9 months 18 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 26.57
Options Exercisable, Number Of Options Exercisable | shares 877,131
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 26.59
Exercise Price Range From $23.53 to $25.86 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Lower Range Limit (in dollars per share) 23.53
Exercise Prices, Upper Range Limit (in dollars per share) $ 25.86
Options Outstanding, Number of Options Outstanding | shares 689,993
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 3 years 4 months 24 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 25.11
Options Exercisable, Number Of Options Exercisable | shares 350,843
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 24.67
Exercise Price Range From $27.04 to $28.50 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Prices, Lower Range Limit (in dollars per share) 27.04
Exercise Prices, Upper Range Limit (in dollars per share) $ 28.50
Options Outstanding, Number of Options Outstanding | shares 812,500
Options Outstanding, Weighted Average Remaining Contractual Life (in years) 4 years 2 months 12 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 27.81
Options Exercisable, Number Of Options Exercisable | shares 526,288
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 27.87