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EQUITY-BASED COMPENSATION - Equity Options (Details) - Equity options - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 28, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense $ 1.0 $ 1.4 $ 2.3 $ 2.7    
Unrecognized compensation expense $ 2.2   $ 2.2      
Weighted-average period for recognition (in years)     1 year      
Class A Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share Price         $ 11.61 $ 6.32