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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 15,205 $ 12,337 $ 30,104 $ 21,153
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     22,800 2,200
Share-based compensation expense 13,600 $ 11,200 27,400 $ 19,200
Compensation not yet recognized $ 81,000   $ 81,000  
Weighted-average period of unrecognized compensation cost     2 years 29 days