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EQUITY-BASED COMPENSATION PLANS - Summary of Equity-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation $ 1,023 $ 607 $ 2,183 $ 795
2018 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation 841 0 1,765 0
2014 Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation 182 607 418 795
Earnout Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based compensation $ 0 $ 0 $ 0 $ 0