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STOCK INCENTIVE PLANS - Stock Options Outstanding and Exercisable (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options outstanding, number (in shares) 2,124,036 2,226,286 2,582,804 2,850,455
Options outstanding, weighted-average remaining contractual life (in years) 5 years 8 months 23 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 186.59      
Options outstanding intrinsic value $ 96,987      
Options exercisable (in shares) 1,346,707      
Options exercisable, weighted-average remaining contractual life (in years) 4 years 2 months 19 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 157.19      
Options exercisable intrinsic value $ 97,985      
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) 261,307      
Options outstanding, weighted-average remaining contractual life (in years) 1 year 10 months 6 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 80.95      
Options outstanding intrinsic value $ 39,536      
Options exercisable (in shares) 261,307      
Options exercisable, weighted-average remaining contractual life (in years) 1 year 10 months 6 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 80.95      
Options exercisable intrinsic value $ 39,536      
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) 549,608      
Options outstanding, weighted-average remaining contractual life (in years) 3 years 9 months      
Options outstanding, weighted-average exercise price (in dollars per share) $ 125.86      
Options outstanding intrinsic value $ 58,471      
Options exercisable (in shares) 549,608      
Options exercisable, weighted-average remaining contractual life (in years) 3 years 9 months      
Options exercisable, weighted-average exercise price (in dollars per share) $ 125.86      
Options exercisable intrinsic value $ 58,471      
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) 1,313,121      
Options outstanding, weighted-average remaining contractual life (in years) 7 years 4 months 2 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 233.03      
Options outstanding intrinsic value $ (1,020)      
Options exercisable (in shares) 535,792      
Options exercisable, weighted-average remaining contractual life (in years) 5 years 10 months 10 days      
Options exercisable, weighted-average exercise price (in dollars per share) $ 226.51      
Options exercisable intrinsic value $ (22)