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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2019
STOCK-BASED COMPENSATION |
Schedule of stock-based employee compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Pre-tax expense | ​ | $ | 2,436 | ​ | $ | 2,618 | ​ | $ | 7,324 | ​ | $ | 7,204
After tax expense | ​ | $ | 1,840 | ​ | $ | 1,977 | ​ | $ | 5,530 | ​ | $ | 5,439
Schedule of changes in non-vested restricted shares | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted Average
​ |  | Shares |  | Grant-Date Fair Value
Non-vested shares at December 31, 2018 |  | 2,352,150 | ​ | $ | 17.15
Granted |  | 858,150 | ​ |  | 11.39
Vested |  | (623,590) | ​ |  | 14.73
Forfeited |  | (114,983) | ​ |  | 15.78
Non-vested shares at September 30, 2019 |  | 2,471,727 | ​ | $ | 13.21

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