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EARNINGS PER SHARE | 9 Months Ended
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Sep. 30, 2021
EARNINGS PER SHARE |
EARNINGS PER SHARE | 16. EARNINGS PER SHARE Basic and diluted weighted-average shares outstanding are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Basic weighted average shares outstanding |  | 14,411 |  | 14,271 |  | 14,375 |  | 14,231
Dilutive effect of equity awards |  | 91 |  | 98 |  | 103 |  | 78
Diluted weighted average shares outstanding |  | 14,502 |  | 14,369 |  | 14,478 |  | 14,309
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ For the three and nine months ended September 30, 2021 and 2020, the anti-dilutive common shares excluded from the calculation of diluted earnings per share were immaterial.

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