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SHARE-BASED COMPENSATION (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2019
SHARE-BASED COMPENSATION |
Summary of the Company's restricted stock unit award program | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-Average | ​
​ |  | ​ | ​ | Grant Date | ​
​ | ​ | Units | ​ | Fair Value | ​
Outstanding – January 1, 2019 | ​ | 1,436,983 | ​ | $ | 25.81 | ​
Granted | ​ | 386,520 | ​ | $ | 27.75 | ​
Vested | ​ | (142,594) | ​ | $ | 39.87 | ​
Forfeited(1) | ​ | (18,456) | ​ | $ | 26.56 | ​
Outstanding – June 30, 2019 | ​ | 1,662,453 | ​ | $ | 25.05 | ​
​
(1) | Forfeitures are recognized as they occur.

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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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