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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2019
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation | Restricted Stock
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​ | Six months ended June 30,
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Pre – tax cost | ​ | $ | 544 | ​ | $ | 528 | ​ | $ | 1,082 | ​ | $ | 1,044
After tax cost | ​ | $ | 424 | ​ | $ | 411 | ​ | $ | 844 | ​ | $ | 814
Schedule of summary of the changes in non-vested restricted shares | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant-Date
​ |  | Shares |  | Fair Value
Non-vested shares at December 31, 2018 |  | 947,710 | ​ | $ | 9.41
Granted |  | 141,600 | ​ |  | 17.21
Vested |  | 260,770 | ​ |  | 7.65
Forfeited |  | (11,300) | ​ |  | 12.47
Non-vested shares at June 30, 2019 |  | 817,240 | ​ | ​ | 11.28

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