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CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Options    
Outstanding, beginning balance (in shares) 7,822,514  
Grants (in shares) 151,040  
Exercised (in shares) (725,685)  
Forfeitures (in shares) (197,677)  
Outstanding, ending balance (in shares) 7,050,192 7,822,514
Vested (in shares) 4,507,070  
Exercisable (in shares) 4,507,070  
Weighted Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 74.42  
Grants (in dollars per share) 82.46  
Exercised (in dollars per share) 65.58  
Terminated (in dollars per share) 77.87  
Outstanding, ending balance (in dollars per share) 75.40 $ 74.42
Vested (in dollars per share) 71.17  
Exercisable (in dollars per share) $ 71.17  
Aggregate Intrinsic Value (in thousands)    
Outstanding, aggregate intrinsic value $ 44,067 $ 85,222
Average Remaining Life (years)    
Outstanding, average remaining life (in years) 6 years 4 months 24 days 7 years 2 months 12 days
Vested, average remaining life (in years) 5 years 7 months 6 days  
Exercisable, average remaining life (in years) 5 years 7 months 6 days