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STOCKHOLDERS EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2022
Equity [Abstract] |
Components of the Company's stock-based compensation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
(in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021 | ​
Time lapse restricted stock: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​
Pre-tax compensation expense | ​ | $ | 4,819 | ​ | $ | 3,920 | ​ | $ | 10,957 | ​ | $ | 7,841 | ​
Tax benefit | ​ |  | (1,272) | ​ |  | (1,039) | ​ |  | (2,596) | ​ |  | (1,925) | ​
Restricted stock expense, net of tax | ​ | $ | 3,547 | ​ | $ | 2,881 | ​ | $ | 8,361 | ​ | $ | 5,916 | ​
Summary information on unvested restricted stock outstanding | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant-Date
(number of shares in thousands) |  | Shares |  | Fair Value
Unvested Restricted Stock at December 31, 2021 |  | 2,596 |  | $ | 26.26
Forfeited |  | (49) |  | ​ | 26.02
Vested |  | (666) |  | ​ | 19.97
Granted |  | 780 |  | ​ | 29.75
Unvested Restricted Stock at June 30, 2022 |  | 2,661 | ​ | $ | 28.78

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