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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 12,337 $ 10,325 $ 21,153 $ 17,372
Share-Based Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of share-based awards vested     2,200 1,000
Share-based compensation expense 11,200 $ 9,800 19,200 $ 16,300
Compensation not yet recognized $ 65,200   $ 65,200  
Total unrecognized compensation cost, weighted average period     2 years 3 months