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EQUITY-BASED COMPENSATION - Equity-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Compensation expense to be recognized    
Unrecognized compensation costs related to non-vested awards $ 11,951  
2020 4,557  
2021 4,513  
2022 2,433  
2023 431  
2024 17  
Restricted Stock Awards | Time-Based    
Compensation expense to be recognized    
Unrecognized compensation costs related to non-vested awards 5,023  
2020 1,871  
2021 1,859  
2022 1,041  
2023 235  
2024 17  
Restricted Stock Awards | Performance-Based    
Compensation expense to be recognized    
Unrecognized compensation costs related to non-vested awards 6,928  
2020 2,686  
2021 2,654  
2022 1,392  
2023 196  
2024 0  
Corporate general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense 1,475 $ 1,352
Corporate general and administrative | Restricted Stock Awards | Time-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense 602 542
Corporate general and administrative | Restricted Stock Awards | Performance-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense $ 873 $ 810