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STOCK-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2019
STOCK-BASED COMPENSATION |
STOCK-BASED COMPENSATION | 5. STOCK-BASED COMPENSATION In April 2014, the Company reserved 8,000,000 shares of common stock under the 2014 Stock Incentive Plan with a term of 10 years expiring in April 2024. This plan provides for the issuance of various forms of stock incentives, including, among others, incentive and non-qualified stock options and restricted shares. As of June 30, 2019, there were 4,578,747 shares available for grant. Stock-based employee compensation expense was as follows for the periods indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Pre-tax expense | ​ | $ | 2,436 | ​ | $ | 2,031 | ​ | $ | 4,888 | ​ | $ | 4,586
After tax expense | ​ | $ | 1,839 | ​ | $ | 1,533 | ​ | $ | 3,690 | ​ | $ | 3,462
​ Restricted Stock The following is a summary of the changes in non-vested restricted shares for the six months ended June 30, 2019: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | 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 |  | (615,160) | ​ |  | 14.71
Forfeited |  | (37,613) | ​ |  | 15.69
Non-vested shares at June 30, 2019 |  | 2,557,527 | ​ | $ | 13.21
​ The total fair value of shares vested was $6,970,000 during the six months ended June 30, 2019 and $16,194,000 during the six months ended June 30, 2018. Excess tax benefits or deficits realized from tax compensation deductions in excess of, or lower than compensation expense are recorded as either a beneficial or detrimental discrete tax adjustment. This discrete tax adjustment was a detriment of $510,000 for the six months ended June 30, 2019 and a benefit of $1,620,000 for the six months ended June 30, 2018. As of June 30, 2019, total unrecognized compensation cost related to non-vested restricted shares was $48,384,000, which is expected to be recognized over a weighted-average period of 3.9 years.

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