EQUITY-BASED COMPENSATION - Weighted Average Discounts (Details) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| 2007 Omnibus Equity Incentive Plan, Plan Grants | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Discount for the lack of distributions until vested | 8.20% | 26.10% | 10.10% | 26.20% |
| Marketability discount for transfer restrictions | 5.80% | 3.80% | 5.80% | 3.90% |
| 2007 Omnibus Equity Incentive Plan, Bonus Grants | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Marketability discount for transfer restrictions | 3.00% | 2.30% | 3.40% | 2.20% |