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EQUITY-BASED COMPENSATION - Equity-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Compensation expense to be recognized    
Unrecognized compensation costs related to non-vested awards $ 11,746  
2019 4,366  
2020 4,384  
2021 2,531  
2022 449  
2023 16  
Restricted Stock Awards | Time-Based    
Compensation expense to be recognized    
Unrecognized compensation costs related to non-vested awards 4,889  
2019 1,780  
2020 1,806  
2021 1,054  
2022 233  
2023 16  
Restricted Stock Awards | Performance-Based    
Compensation expense to be recognized    
Unrecognized compensation costs related to non-vested awards 6,857  
2019 2,586  
2020 2,578  
2021 1,477  
2022 216  
2023 0  
Corporate general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense 1,352 $ 2,227
Corporate general and administrative | Restricted Stock Awards | Time-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense 542 836
Corporate general and administrative | Restricted Stock Awards | Performance-Based    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense 810 1,374
Corporate general and administrative | Stock awards | Directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share based compensation expense $ 0 $ 17