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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 16,496 $ 15,205 $ 27,914 $ 30,104
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     24,600 22,800
Share-based compensation expense 14,800 $ 13,600 24,900 $ 27,400
Compensation not yet recognized $ 94,700   $ 94,700  
Weighted-average period of unrecognized compensation cost     2 years 2 months 12 days