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STOCK-BASED COMPENSATION - Restricted Stock and Restricted Stock Units Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Liability associated with RSUs $ 9,174 $ 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 $ 44  
Weighted-average remaining requisite service period 1 year 9 months 8 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 $ 51,937  
Weighted-average remaining requisite service period 2 years 8 months 30 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 $ 29,486  
Weighted-average remaining requisite service period 2 years 6 months 11 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 $ 4,514  
Weighted-average remaining requisite service period 2 years 19 days  
Adjustment to compensation cost $ (183)  
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 $ 9,174 $ 5,964