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EARNINGS PER SHARE | 6 Months Ended
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Jun. 30, 2021
EARNINGS PER SHARE |
EARNINGS PER SHARE | ​ NOTE 4. EARNINGS PER SHARE ​ Basic earnings per share is computed by dividing reported net earnings by the weighted-average number of common shares outstanding during the period. Diluted earnings per share reflect the additional dilution for all potentially dilutive securities such as stock options. The following is a reconciliation of the number of shares (denominator) used in the basic and diluted earnings per share computations (shares in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended June 30, | ​
​ | ​ | 2021 | ​ | 2020 | ​
​ | ​ | ​ | ​ | Per Share | ​ | ​ | ​ | Per Share | ​
​ |  | Shares |  | Amount |  | Shares |  | Amount | ​
Basic |  | 18,595 |  | $ | 0.98 |  | 18,181 |  | $ | (0.24) | ​
Effect of dilutive stock options |  | 870 | ​ |  | (0.05) |  | — | ​ |  | — | ​
Diluted |  | 19,465 |  | $ | 0.93 |  | 18,181 |  | $ | (0.24) | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30, | ​
​ | ​ | 2021 | ​ | 2020 | ​
​ | ​ | ​ | ​ | Per Share | ​ | ​ | ​ | Per Share | ​
​ |  | Shares |  | Amount |  | Shares |  | Amount | ​
Basic |  | 18,538 |  | $ | 1.42 |  | 18,169 |  | $ | (0.13) | ​
Effect of dilutive stock options |  | 843 | ​ |  | (0.06) |  | — | ​ |  | — | ​
Diluted |  | 19,381 |  | $ | 1.36 |  | 18,169 |  | $ | (0.13) | ​
​ ​ Excluded from the computation of diluted earnings per share are options where the exercise prices are greater than the market price as their effects would be anti-dilutive in the computation of diluted earnings per share. For the three months ended June 30, 2021 and 2020, options for approximately 235 thousand and 1,122 thousand shares, respectively, were excluded from the computation. For the six months ended June 30, 2021 and 2020, options for approximately 199 thousand and 1,085 thousand shares, respectively, were excluded from the computation.

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