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EARNINGS PER SHARE | 6 Months Ended
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Jun. 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 | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Basic weighted average shares outstanding |  | 14,406 |  | 14,264 |  | 14,356 |  | 14,211
Dilutive effect of equity awards |  | 88 |  | 40 |  | 111 |  | 67
Diluted weighted average shares outstanding |  | 14,494 |  | 14,304 |  | 14,467 |  | 14,278
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ For the three and six months ended June 30, 2021 and 2020, the anti-dilutive common shares excluded from the calculation of diluted earnings per share were immaterial.

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