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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2020
STOCK-BASED COMPENSATION |
Schedule of stock-based employee compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30
(in thousands) |  | 2020 |  | 2019 |  | 2020 |  | 2019
Pre-tax expense | ​ | $ | 2,017 | ​ | $ | 2,436 | ​ | $ | 4,114 | ​ | $ | 4,888
After tax expense | ​ | $ | 1,523 | ​ | $ | 1,839 | ​ | $ | 3,106 | ​ | $ | 3,690
Schedule of summary of the changes in non-vested restricted shares | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ |  | Shares |  | Grant-Date Fair Value
Non-vested shares at December 31, 2019 |  | 2,393,673 | ​ | $ | 13.23
Granted |  | 1,085,875 | ​ |  | 4.59
Vested |  | (555,291) | ​ |  | 16.63
Forfeited |  | (206,707) | ​ |  | 14.10
Non-vested shares at June 30, 2020 |  | 2,717,434 | ​ | $ | 7.05

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