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EQUITY-BASED COMPENSATION - Equity-Based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Compensation expense to be recognized      
2020 $ 4,376    
2021 2,525    
2022 446    
2023 15    
Total 7,362    
Restricted Stock Awards | Time-based restricted stock      
Compensation expense to be recognized      
2020 1,798    
2021 1,048    
2022 231    
2023 15    
Total 3,092    
Restricted Stock Awards | Performance-based restricted stock      
Compensation expense to be recognized      
2020 2,578    
2021 1,477    
2022 215    
2023 0    
Total 4,270    
Corporate general and administrative      
Equity-based compensation expense      
Share based compensation expense 6,219 $ 6,665 $ 5,887
Corporate general and administrative | Restricted Stock Awards | Time-based restricted stock      
Equity-based compensation expense      
Share based compensation expense 2,327 2,384 2,145
Corporate general and administrative | Restricted Stock Awards | Performance-based restricted stock      
Equity-based compensation expense      
Share based compensation expense 3,396 3,727 3,183
Corporate general and administrative | Director stock | Director stock      
Equity-based compensation expense      
Share based compensation expense $ 496 $ 554 $ 559