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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2020
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation | Restricted Stock
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30,
(in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Pre – tax cost | ​ | $ | 1,500 | ​ | $ | 544 | ​ | $ | 2,657 | ​ | $ | 1,626
After tax cost | ​ | $ | 1,170 | ​ | $ | 424 | ​ | $ | 2,072 | ​ | $ | 1,268
Schedule of summary of the changes in non-vested restricted shares | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant-Date
​ |  | Shares |  | Fair Value
Non-vested shares at December 31, 2019 |  | 815,540 | ​ | $ | 11.29
Granted |  | 179,000 | ​ |  | 4.59
Vested |  | (310,520) | ​ |  | 9.36
Forfeited |  | (5,800) | ​ |  | 9.50
Non-vested shares at September 30, 2020 |  | 678,220 | ​ | $ | 10.43

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