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STOCK-BASED COMPENSATION (Stock Options Outstanding and Exercisable) (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Exercise Price $15.01 to $21.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in dollars per share) $ 15.01
Range of Exercise Prices, Upper Range (in dollars per share) $ 21.00
Number Outstanding (in shares) | shares 100,805
Weighted-Average Remaining Contractual Life (in years) 3 years 2 months 23 days
Weighted-Average Exercise Price (in dollars per share) $ 20.24
Number Exercisable (in shares) | shares 100,805
Weighted-Average Exercise Price (in dollars per share) $ 20.24
Exercise Price $21.01 to $28.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in dollars per share) 21.01
Range of Exercise Prices, Upper Range (in dollars per share) $ 28.00
Number Outstanding (in shares) | shares 159,478
Weighted-Average Remaining Contractual Life (in years) 4 years 6 months 7 days
Weighted-Average Exercise Price (in dollars per share) $ 23.38
Number Exercisable (in shares) | shares 127,077
Weighted-Average Exercise Price (in dollars per share) $ 23.23
Exercise Price $28.01 to $35.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in dollars per share) 28.01
Range of Exercise Prices, Upper Range (in dollars per share) $ 35.00
Number Outstanding (in shares) | shares 508,630
Weighted-Average Remaining Contractual Life (in years) 6 years 5 months 1 day
Weighted-Average Exercise Price (in dollars per share) $ 29.49
Number Exercisable (in shares) | shares 235,833
Weighted-Average Exercise Price (in dollars per share) $ 29.74
Exercise Price $35.01 to $41.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in dollars per share) 35.01
Range of Exercise Prices, Upper Range (in dollars per share) $ 43
Number Outstanding (in shares) | shares 332,138
Weighted-Average Remaining Contractual Life (in years) 8 years 7 months 17 days
Weighted-Average Exercise Price (in dollars per share) $ 40.77
Number Exercisable (in shares) | shares 31,374
Weighted-Average Exercise Price (in dollars per share) $ 39.84
Exercise Price $15.01 to $41.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in dollars per share) 15.01
Range of Exercise Prices, Upper Range (in dollars per share) $ 43
Number Outstanding (in shares) | shares 1,101,051
Weighted-Average Remaining Contractual Life (in years) 6 years 6 months 7 days
Weighted-Average Exercise Price (in dollars per share) $ 31.16
Number Exercisable (in shares) | shares 495,089
Weighted-Average Exercise Price (in dollars per share) $ 26.77