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SHARE-BASED COMPENSATION - Stock Options, Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock options        
Proceeds from exercise of stock options     $ 9,529 $ 4,046
Time Based Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Expiration period     10 years  
Stock options        
Granted (in shares)     0  
Time Based Options | Tranche 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Time Based Options | Tranche 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Time Based Options | Tranche 3        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Time Based Options | Tranche 4        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Market Performance Based Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     4 years  
Expiration period     10 years  
Vesting price hurdle, percent of premium to closing stock price on grant date     25.00%  
Number of consecutive trading days the average stock price meets certain target prices, which satisfy vesting requirements     30 days  
Market Performance Based Options | Tranche 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Market Performance Based Options | Tranche 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Market Performance Based Options | Tranche 3        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Market Performance Based Options | Tranche 4        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate per year (as a percent)     25.00%  
Stock Options        
Stock options        
Granted (in shares) 20,000 45,750 20,000 4,100,000
Weighted average grant date fair value (in dollars per share) $ 4.15 $ 3.85 $ 4.15 $ 1.86
Options exercised, intrinsic value $ 2,700 $ 800 $ 6,500 $ 2,800
Unrecognized compensation expense 4,300 11,700 $ 4,300 $ 11,700
Weighted-average period for recognition of unrecognized compensation expense     3 years 2 years 3 months 24 days
Non-cash compensation expense     $ 4,700 $ 4,800
Proceeds from exercise of stock options $ 3,200 $ 2,200 $ 9,500 $ 4,000