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SHARE-BASED AWARDS AND STOCK OPTIONS - Stock Options - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 43,325 $ 34,983 $ 80,490 $ 62,805
Employee stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 1,800 $ 2,200 4,200 4,100
Aggregate intrinsic value of stock options exercised     23,100 $ 66,500
Total unrecognized compensation cost $ 11,900   $ 11,900  
Weighted-average period of unrecognized compensation cost     2 years 1 month 6 days  
Weighted average grant date fair value for each option granted (USD per share) $ 65.99 $ 54.85 $ 65.99 $ 54.85