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SHARE-BASED AWARDS AND STOCK OPTIONS - Share-Based Awards - Narrative (Details) - USD ($)
$ 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
Restricted Stock Awards and Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     97,200 76,000
Share-based compensation expense 39,900 $ 30,800 73,300 $ 56,000
Compensation not yet recognized $ 254,100   $ 254,100  
Weighted-average period of unrecognized compensation cost     2 years 2 months 12 days