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Reconciliation of Basic and Diluted Shares | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Reconciliation of Basic and Diluted Shares | Reconciliation of Basic and Diluted Shares
|  | Three Months Ended |  | Six Months Ended
|  | June 30 |  | June 30
(In thousands, except per share amounts) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders |  | $ | 18,635 |  |  | $ | (27,994 | ) |  | $ | 27,902 |  |  | $ | (38,544 | )
Weighted-average shares outstanding - basic |  | 80,535 |  |  | 80,337 |  |  | 80,460 |  |  | 80,288 |
Dilutive effect of stock-based compensation |  | 2,315 |  |  | — |  |  | 2,098 |  |  | — |
Weighted-average shares outstanding - diluted |  | 82,850 |  |  | 80,337 |  |  | 82,558 |  |  | 80,288 |
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic |  | $ | 0.23 |  |  | $ | (0.35 | ) |  | $ | 0.35 |  |  | $ | (0.48 | )
Diluted |  | $ | 0.22 |  |  | $ | (0.35 | ) |  | $ | 0.34 |  |  | $ | (0.48 | )
The following average outstanding stock-based compensation units were not included in the computation of diluted earnings (loss) per share because the effect was antidilutive:
|  | Three Months Ended |  | Six Months Ended
|  | June 30 |  | June 30
(In thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Restricted stock units |  | — |  |  | 957 |  |  | — |  |  | 694 |
Stock options |  | 55 |  |  | 90 |  |  | 55 |  |  | 90 |
Stock appreciation rights |  | 972 |  |  | 1,641 |  |  | 1,117 |  |  | 1,364 |
Performance share units |  | 176 |  |  | 835 |  |  | 320 |  |  | 572 |

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