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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate unamortized outstanding stock based compensation   $ 29.7 $ 20.4
Performance-based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period (in years) 10 years    
2013 Omnibus Equity Award Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate common stock available for future grants (in shares) 6,834,553 6,834,553  
Minimum | Time-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Maximum | Time-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 4 years