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STOCK-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2021
STOCK-BASED COMPENSATION |
STOCK-BASED COMPENSATION | ​ NOTE 16. STOCK-BASED COMPENSATION On May 4, 2017, the stockholders approved the Company’s 2017 Omnibus Incentive Plan ("the 2017 Plan"), and all shares that were then available for issuance under the 2008 Omnibus Incentive Plan are now available for issuance under the 2017 Plan. The 2017 Plan and 2008 Plan provide for the grant of stock options, stock appreciation rights, restricted stock, stock units (including deferred stock units), unrestricted stock, and dividend equivalent rights. Any of the awards issued may be issued as performance-based awards to align stock compensation awards to the attainment of annual or long-term performance goals. As of June 30, 2021, there were 1.9 million shares available for grant under the 2017 Plan. ​ Restricted stock units ("RSU’s") are generally granted with a grant date fair value equal to the market price of our stock on the date of grant and with generally a three or four-year vesting schedule or performance-based vesting as determined at the time of grant. ​ Stock option awards are generally granted with an exercise price equal to the market price of our stock on the date of grant and with either a three or four-year vesting schedule or performance-based vesting as determined at the time of grant. Stock option awards generally have a term of 10 years. ​ We recognize stock-based compensation expense based on the fair value of the awards issued and the functional area of the employee receiving the award. Stock-based compensation was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Stock-based compensation expense | ​ | $ | 3,444 | ​ | $ | 2,837 | ​ | $ | 9,145 | ​ | $ | 5,885
​ Changes in our RSUs were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2021
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant Date
​ | ​ | RSUs | ​ | Fair Value
RSUs outstanding at beginning of period |  | 608 | ​ | $ | 58.15
RSUs granted |  | 358 | ​ | $ | 95.79
RSUs vested |  | (173) | ​ | $ | 62.80
RSUs forfeited |  | (145) | ​ | $ | 66.23
RSUs outstanding at end of period |  | 648 | ​ | $ | 75.93
​ Changes in our stock options were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30, 2021
​ |  | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Exercise Price
​ | ​ | Options | ​ | per Share
Options outstanding at beginning of period |  | 147 | ​ | $ | 23.63
Options exercised |  | (23) | ​ | $ | 21.42
Options expired |  | — | ​ | $ | —
Options outstanding at end of period |  | 124 | ​ | $ | 24.03
​

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