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STOCK-BASED COMPENSATION (Stock Options Outstanding and Exercisable) (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Exercise Price $15.01 to $21.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) $ 15.01
Range of Exercise Prices, Upper Range (in usd per share) $ 21.00
Options Outstanding, Number Outstanding (in shares) | shares 194,832
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 5 years 2 months 23 days
Options Outstanding, Weighted-Average Exercise Price (in usd per share) $ 20.21
Options Exercisable, Number Exercisable (in shares) | shares 129,536
Options Exercisable, Weighted-Average Exercise Price (in usd per share) $ 19.96
Exercise Price $21.01 to $28.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 21.01
Range of Exercise Prices, Upper Range (in usd per share) $ 28.00
Options Outstanding, Number Outstanding (in shares) | shares 234,221
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 6 years 5 months 26 days
Options Outstanding, Weighted-Average Exercise Price (in usd per share) $ 23.38
Options Exercisable, Number Exercisable (in shares) | shares 117,226
Options Exercisable, Weighted-Average Exercise Price (in usd per share) $ 22.98
Exercise Price $28.01 to $35.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 28.01
Range of Exercise Prices, Upper Range (in usd per share) $ 35.00
Options Outstanding, Number Outstanding (in shares) | shares 745,327
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 7 years 2 months 23 days
Options Outstanding, Weighted-Average Exercise Price (in usd per share) $ 30.16
Options Exercisable, Number Exercisable (in shares) | shares 213,344
Options Exercisable, Weighted-Average Exercise Price (in usd per share) $ 32.31
Exercise Price $35.01 to $41.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 35.01
Range of Exercise Prices, Upper Range (in usd per share) $ 41.00
Options Outstanding, Number Outstanding (in shares) | shares 209,500
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 9 months
Options Outstanding, Weighted-Average Exercise Price (in usd per share) $ 37.10
Options Exercisable, Number Exercisable (in shares) | shares 207,000
Options Exercisable, Weighted-Average Exercise Price (in usd per share) $ 37.11
Exercise Price $15.01 to $41.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range (in usd per share) 15.01
Range of Exercise Prices, Upper Range (in usd per share) $ 41.00
Options Outstanding, Number Outstanding (in shares) | shares 1,383,880
Options Outstanding, Weighted-Average Remaining Contractual Life (in years) 5 years 10 months 2 days
Options Outstanding, Weighted-Average Exercise Price (in usd per share) $ 28.66
Options Exercisable, Number Exercisable (in shares) | shares 667,106
Options Exercisable, Weighted-Average Exercise Price (in usd per share) $ 29.76