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EQUITY-BASED COMPENSATION - Additional (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock issued for director fees (in shares) |  |  | 2,299 | 2,454
Compensation expense to be recognized |  |  |  |
Unrecognized compensation costs related to non-vested awards | $ 9,183 |  | $ 9,183 |
2018 | 2,603 |  | 2,603 |
2019 | 3,935 |  | 3,935 |
2020 | 2,243 |  | 2,243 |
2021 | 389 |  | 389 |
2022 | 13 |  | 13 |
Restricted Stock Awards | Time-Based |  |  |  |
Compensation expense to be recognized |  |  |  |
Unrecognized compensation costs related to non-vested awards | 3,822 |  | 3,822 |
2018 | 1,035 |  | 1,035 |
2019 | 1,615 |  | 1,615 |
2020 | 956 |  | 956 |
2021 | 203 |  | 203 |
2022 | 13 |  | 13 |
Restricted Stock Awards | Performance-Based |  |  |  |
Compensation expense to be recognized |  |  |  |
Unrecognized compensation costs related to non-vested awards | 5,361 |  | 5,361 |
2018 | 1,568 |  | 1,568 |
2019 | 2,320 |  | 2,320 |
2020 | 1,287 |  | 1,287 |
2021 | 186 |  | 186 |
2022 | 0 |  | 0 |
Corporate general and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based compensation expense | 1,821 | $ 1,864 | 4,048 | $ 2,994
Corporate general and administrative | Restricted Stock Awards | Time-Based |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based compensation expense | 516 | 590 | 1,352 | 1,066
Corporate general and administrative | Restricted Stock Awards | Performance-Based |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based compensation expense | 785 | 850 | 2,159 | 1,484
Corporate general and administrative | Stock awards | Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based compensation expense | $ 520 | $ 424 | $ 537 | $ 444
Common Stock | Directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock issued for director fees (in shares) |  |  | 2,299 |
Common Stock | Independent directors |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock issued for director fees (in shares) |  |  | 34,130 |

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