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STOCK-BASED COMPENSATION - Changes in Outstanding Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of Shares      
Balance at beginning of period (shares) 6,586    
Granted (shares) 80 1,200 1,700
Exercised (shares) (774)    
Forfeited (shares) (72)    
Expired (shares) (6)    
Balance at end of period (shares) 5,814 6,586  
Options exercisable (shares) 3,592    
Weighted Average Exercise Price      
Balance at beginning of period (USD per share) $ 60.57    
Granted (USD per share) 152.53    
Exercised (USD per share) 52.56    
Forfeited (USD per share) 57.52    
Expired (USD per share) 19.51    
Balance at end of period (USD per share) 62.97 $ 60.57  
Options exercisable (USD per share) $ 59.64    
Weighted Average Remaining Contractual Term (In Years)      
Remaining term at end of period 6 years 1 month 6 days    
Term of options exercisable 5 years 3 months 18 days    
Aggregate Intrinsic Value      
Balance at end of period $ 698,128    
Options exercisable $ 443,293