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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 14,898 $ 8,816
Share-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of share-based awards vested 13,000 100
Share-based compensation expense 13,800 $ 8,000
Compensation not yet recognized $ 82,600  
Weighted-average period of unrecognized compensation cost 2 years 1 month 25 days