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SHARE-BASED AWARDS AND STOCK OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 27,877 $ 14,833 $ 55,791 $ 44,937
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     35,300 45,000
Share-based compensation expense 20,200 $ 13,800 45,000 $ 41,100
Compensation not yet recognized $ 175,100   $ 175,100  
Weighted-average period of unrecognized compensation cost     2 years 2 months 12 days