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SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 65,611 $ 42,276 $ 146,097 $ 105,081
Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,900 $ 2,400 6,000 6,500
Aggregate intrinsic value of stock options exercised     23,400 $ 69,800
Total unrecognized compensation cost $ 10,100   $ 10,100  
Weighted-average period of unrecognized compensation cost     1 year 10 months 24 days  
Weighted average grant date fair value for each option granted (USD per share) $ 65.99 $ 54.85 $ 65.99 $ 54.85