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STOCK-BASED COMPENSATION - Stock Options Activity (Details)
 12 Months Ended
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Share-based Payment Arrangements [Abstract]    
Number of options, beginning of year (in shares) | shares 2,719,612 2,637,890
Number of options, Granted (in shares) | shares 1,179,160 850,700
Number of options, Exercised (in shares) | shares (743,977) (679,706)
Number of options, Forfeited (in shares) | shares 0 (89,272)
Number of options, end of year (in shares) | shares 3,154,795 2,719,612
Number of options, Exercisable, end of year (in shares) | shares 993,645 1,059,590
Weighted average exercise price, beginning of year (in dollars per share) | $ / shares $ 53.22 $ 49.42
Weighted average exercise price, Granted (in dollars per share) | $ / shares 72.03 58.88
Weighted average exercise price, Exercised (in dollars per share) | $ / shares 46.56 45.20
Weighted average exercise price, Forfeited (in dollars per share) | $ / shares 0 55.94
Weighted average exercise price, end of year (in dollars per share) | $ / shares 61.82 53.22
Weighted average exercise price, Exercisable, end of year (in dollars per share) | $ / shares $ 52.38 $ 46.26