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STOCKHOLDERS' EQUITY AND EQUITY INSTRUMENTS (Summary of Exercise Price Range) (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options outstanding (in shares) 562,877 442,755
Weighted-average remaining contractual life of options outstanding 4 years 7 months 6 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 75.89  
Options exercisable (in shares) 221,212  
Weighted-average remaining contractual life of exercisable options 3 years  
Weighted-average exercise price of exercisable options (in dollars per share) $ 81.31  
$68.00 - $69.24 [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) 68.00  
Exercise price range, upper range limit (in dollars per share) $ 69.24  
Options outstanding (in shares) 195,232  
Weighted-average remaining contractual life of options outstanding 6 years 3 months 18 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 68.00  
Options exercisable (in shares) 0  
Weighted-average remaining contractual life of exercisable options 0 years  
Weighted-average exercise price of exercisable options (in dollars per share) $ 0.00  
$69.25 - $71.09 [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) 69.25  
Exercise price range, upper range limit (in dollars per share) $ 71.09  
Options outstanding (in shares) 120,117  
Weighted-average remaining contractual life of options outstanding 5 years 2 months 12 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 70.48  
Options exercisable (in shares) 30,471  
Weighted-average remaining contractual life of exercisable options 5 years 2 months 12 days  
Weighted-average exercise price of exercisable options (in dollars per share) $ 70.48  
$71.10 - $81.73 [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) 71.10  
Exercise price range, upper range limit (in dollars per share) $ 81.73  
Options outstanding (in shares) 84,605  
Weighted-average remaining contractual life of options outstanding 2 years  
Weighted-average exercise price of options outstanding (in dollars per share) $ 75.63  
Options exercisable (in shares) 84,605  
Weighted-average remaining contractual life of exercisable options 2 years  
Weighted-average exercise price of exercisable options (in dollars per share) $ 75.63  
$81.74 - $89.47 [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) 81.74  
Exercise price range, upper range limit (in dollars per share) $ 89.47  
Options outstanding (in shares) 79,349  
Weighted-average remaining contractual life of options outstanding 2 years 7 months 6 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 87.04  
Options exercisable (in shares) 62,974  
Weighted-average remaining contractual life of exercisable options 2 years 4 months 24 days  
Weighted-average exercise price of exercisable options (in dollars per share) $ 87.00  
$89.48 - $93.26 [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) 89.48  
Exercise price range, upper range limit (in dollars per share) $ 93.26  
Options outstanding (in shares) 83,574  
Weighted-average remaining contractual life of options outstanding 4 years 2 months 12 days  
Weighted-average exercise price of options outstanding (in dollars per share) $ 91.77  
Options exercisable (in shares) 43,162  
Weighted-average remaining contractual life of exercisable options 4 years 2 months 12 days  
Weighted-average exercise price of exercisable options (in dollars per share) $ 91.77