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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 11,418 $ 14,898
Share-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of share-based awards vested 20,800 13,000
Share-based compensation expense 10,100 $ 13,800
Compensation not yet recognized $ 110,400  
Weighted-average period of unrecognized compensation cost 2 years 5 months