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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2021
STOCK-BASED COMPENSATION |
Schedule of stock-based employee compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2021 | ​ | 2020 |  | 2021 | ​ | 2020
Pre-tax expense | ​ | $ | 1,471 | ​ | $ | 2,017 | ​ | $ | 3,010 | ​ | $ | 4,114
After tax expense | ​ | $ | 1,103 | ​ | $ | 1,523 | ​ | $ | 2,257 | ​ | $ | 3,106
Schedule of summary of the changes in non-vested restricted shares | The following is a summary of the changes in non-vested restricted shares for the six months ended June 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ |  | Shares |  | Grant-Date Fair Value
Non-vested shares at December 31, 2020 | ​ | 2,235,179 | ​ | $ | 6.81
Granted |  | 1,010,700 |  | ​ | 3.87
Vested |  | (434,208) |  | ​ | 14.96
Forfeited |  | (95,260) |  | ​ | 6.85
Non-vested shares at June 30, 2021 |  | 2,716,411 | ​ | $ | 7.91
​

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