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SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 37,165 $ 27,822
Employee stock option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 2,400 1,900
Aggregate intrinsic value of stock options exercised 20,600 $ 53,600
Total unrecognized compensation cost $ 14,100  
Weighted-average period of unrecognized compensation cost 2 years 3 months 18 days  
Weighted average grant date fair value for each option granted (USD per share) $ 65.99 $ 54.85