EQUITY-BASED COMPENSATION - Equity-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Compensation expense to be recognized
Unrecognized compensation costs related to non-vested awards	$ 8,900		$ 8,900
2020	1,518		1,518
2021	4,509		4,509
2022	2,429		2,429
2023	428		428
2024	16		16
Corporate general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	1,517	$ 1,450	4,958	$ 4,766
Director stock | Corporate general and administrative | Director stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	0	0	447	496
Time-based restricted stock | Restricted Stock Awards
Compensation expense to be recognized
Unrecognized compensation costs related to non-vested awards	3,763		3,763
2020	623		623
2021	1,855		1,855
2022	1,037		1,037
2023	232		232
2024	16		16
Time-based restricted stock | Restricted Stock Awards | Corporate general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	622	588	1,847	1,736
Performance-based restricted stock | Restricted Stock Awards
Compensation expense to be recognized
Unrecognized compensation costs related to non-vested awards	5,137		5,137
2020	895		895
2021	2,654		2,654
2022	1,392		1,392
2023	196		196
2024	0		0
Performance-based restricted stock | Restricted Stock Awards | Corporate general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 895	$ 862	$ 2,664	$ 2,534