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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, 2018
Dec. 31, 2017
Options    
Outstanding, Beginning Balance (in shares) 7,382,072  
Grants (in shares) 1,074,665  
Exercised (in shares) (578,467)  
Terminated (in shares) (55,756)  
Outstanding, Ending Balance (in shares) 7,822,514 7,382,072
Vested (in shares) 4,191,118  
Exercisable (in shares) 4,191,118  
Weighted Average Exercise Price    
Outstanding, Beginning Balance (in dollars per share) $ 71.58  
Grants (in dollars per share) 88.92  
Exercised (in dollars per share) 65.13  
Terminated (in dollars per share) 73.92  
Outstanding, Ending Balance (in dollars per share) 74.42 $ 71.58
Vested (in dollars per share) 68.35  
Exercisable (in dollars per share) $ 68.35  
Aggregate Intrinsic Value (in thousands)    
Aggregate Intrinsic Value, outstanding options $ 85,222 $ 129,295
Average Remaining Life (years)    
Average Remaining Life, outstanding options 7 years 2 months 12 days 7 years 7 months 6 days
Vested 5 years 10 months 25 days  
Exercisable 5 years 10 months 25 days