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STOCK-BASED COMPENSATION - Stock Options (Details) - $ / shares
6 Months Ended
Jun. 30, 2021
Options  
Outstanding, beginning balance (in shares) 4,379,663
Exercised (in shares) (997,788)
Outstanding, ending balance (in shares) 3,381,875
Exercisable at current period-end (in shares) 3,381,875
Weighted- average exercise price  
Weighted-average exercise price of options outstanding, beginning balance (in dollars per share) $ 71.67
Weighted-average exercise price of options exercised (in dollars per share) 69.84
Weighted-average exercise price of options outstanding, ending balance (in dollars per share) 72.21
Weighted-average exercise price of options exercisable at current period-end (in dollars per share) $ 72.21