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Reconciliation of Basic and Diluted Shares | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Shares | Reconciliation of Basic and Diluted Shares
|  | Three Months Ended |  | Nine Months Ended
|  | September 30 |  | September 30
(In thousands, except per share amounts) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders |  | $ | 8,696 |  |  | $ | (7,843) |  |  | $ | 24,621 |  |  | $ | (27,375) |
Weighted-average shares outstanding: |  |  |  |  |  |  |  |
Weighted-average shares outstanding - basic |  | 79,287 |  |  | 79,000 |  |  | 79,214 |  |  | 78,916 |
Dilutive effect of stock-based compensation |  | 988 |  |  | — |  |  | 1,142 |  |  | — |
Weighted-average shares outstanding - diluted |  | 80,275 |  |  | 79,000 |  |  | 80,356 |  |  | 78,916 |
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic |  | $ | 0.11 |  |  | $ | (0.10) |  |  | $ | 0.31 |  |  | $ | (0.35) |
Diluted |  | $ | 0.11 |  |  | $ | (0.10) |  |  | $ | 0.31 |  |  | $ | (0.35) |
The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was either antidilutive or the market conditions for the performance share units were not met:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30 |  | September 30
(In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Restricted stock units |  | — |  |  | 691 |  |  | — |  |  | 723 |
Stock appreciation rights |  | 842 |  |  | 2,383 |  |  | 719 |  |  | 2,499 |
Performance share units |  | 1,004 |  |  | 857 |  |  | 902 |  |  | 894 |

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