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SHARE-BASED AWARDS AND OPTIONS - Share-Based Awards Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 8,816 $ 7,047
Share-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value of share-based awards vested 100 200
Share-based compensation expense 8,000 $ 6,500
Compensation not yet recognized $ 72,200  
Total unrecognized compensation cost, weighted average period 2 years 4 months 17 days