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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 14,833 $ 9,617 $ 44,937 $ 30,771
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     45,000 27,600
Share-based compensation expense 13,800 $ 8,600 41,100 $ 27,700
Compensation not yet recognized $ 67,700   $ 67,700  
Weighted-average period of unrecognized compensation cost     2 years 1 month 6 days