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STOCK-BASED COMPENSATION - Restricted Stock and Restricted Stock Units Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Liability associated with RSUs $ 4,338 $ 5,964
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 56  
Weighted-average remaining requisite service period 1 year 1 month 17 days  
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 56,843  
Weighted-average remaining requisite service period 2 years 11 months 16 days  
Vested RSUs with deferred delivery 3,894  
Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 29,706  
Weighted-average remaining requisite service period 2 years 8 months 28 days  
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 5,128  
Weighted-average remaining requisite service period 2 years 1 month 27 days  
Deferred compensation due to employees | Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Liability associated with RSUs $ 4,338 $ 5,964