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EMPLOYEE BENEFIT PLANS (Tables) | 12 Months Ended
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Dec. 31, 2019
EMPLOYEE BENEFIT PLANS |
Summary of LTIP Units and restricted stock activities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | LTIP Units | ​ | Restricted Stock
​ |  | ​ |  | ​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Average Fair
​ | ​ | ​ | ​ | Average Fair | ​ | ​ | ​ | Value Per
​ | ​ | Number of | ​ | Value Per | ​ | Number | ​ | Restricted
​ | ​ | LTIP Units | ​ | LTIP Unit | ​ | of shares | ​ | Stock
Balance, December 31, 2018 |  | 611 | ​ | $ | 37.00 |  | 307 | ​ | $ | 36.58
Granted |  | 674 | ​ |  | 39.74 |  | 124 | ​ |  | 38.35
Vested |  | (427) | ​ |  | 39.33 |  | (176) | ​ |  | 36.61
Forfeited |  | — | ​ |  | 37.69 |  | (7) | ​ |  | 37.73
Balance, December 31, 2019 |  | 858 | ​ | $ | 37.77 |  | 248 | ​ | $ | 37.29

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