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STOCK INCENTIVE PLANS - Stock Options Outstanding and Exercisable (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options outstanding, number (in shares) 1,933,713 2,124,036 2,226,286 2,582,804
Options outstanding, weighted-average remaining contractual life (in years) 5 years 11 months 8 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 207.10      
Options outstanding intrinsic value $ 56,374      
Options exercisable (in shares) 1,375,844      
Options exercisable, weighted-average remaining contractual life (in years) 4 years 11 months 23 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 196.83      
Options exercisable intrinsic value $ 54,242      
Range 1 of Exercise Prices [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price range, lower range limit (in dollars per share) $ 72.14      
Exercise price range, upper range limit (in dollars per share) $ 85.82      
Options outstanding, number (in shares) 84,831      
Options outstanding, weighted-average remaining contractual life (in years) 10 months 13 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 80.11      
Options outstanding intrinsic value $ 13,246      
Options exercisable (in shares) 84,831      
Options exercisable, weighted-average remaining contractual life (in years) 10 months 13 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 80.11      
Options exercisable intrinsic value $ 13,246      
Range 2 of Exercise Prices [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price range, lower range limit (in dollars per share) $ 102.26      
Exercise price range, upper range limit (in dollars per share) $ 196.31      
Options outstanding, number (in shares) 363,820      
Options outstanding, weighted-average remaining contractual life (in years) 2 years 11 months 16 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 133.79      
Options outstanding intrinsic value $ 37,275      
Options exercisable (in shares) 362,677      
Options exercisable, weighted-average remaining contractual life (in years) 2 years 11 months 8 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 133.68      
Options exercisable intrinsic value $ 37,199      
Range 3 of Exercise Prices [Member]        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Exercise price range, lower range limit (in dollars per share) $ 204.01      
Exercise price range, upper range limit (in dollars per share) $ 262.14      
Options outstanding, number (in shares) 1,485,062      
Options outstanding, weighted-average remaining contractual life (in years) 6 years 11 months 16 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 232.31      
Options outstanding intrinsic value $ 5,853      
Options exercisable (in shares) 928,336      
Options exercisable, weighted-average remaining contractual life (in years) 6 years 1 month 28 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 232.16      
Options exercisable intrinsic value $ 3,797