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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Common Stock Outstanding Roll Forward | The following table summarizes the Company's common stock:
|  | Shares Issued |  | Treasury Shares (a) |  | Outstanding Shares
Outstanding, January 1, 2017 |  | 112,499,874 |  |  | 32,324,911 |  |  | 80,174,963 |
Shares issued for vested restricted stock units |  | 375,355 |  |  | 105,431 |  |  | 269,924 |
Stock appreciation rights exercised |  | 12,897 |  |  | 3,932 |  |  | 8,965 |
Outstanding, December 31, 2017 |  | 112,888,126 |  |  | 32,434,274 |  |  | 80,453,852 |
Shares issued for vested restricted stock units |  | 545,908 |  |  | 161,774 |  |  | 384,134 |
Stock appreciation rights exercised |  | 39,917 |  |  | 11,808 |  |  | 28,109 |
Treasury shares purchased |  | — |  |  | 1,321,072 |  |  | (1,321,072 | )
Outstanding, December 31, 2018 |  | 113,473,951 |  |  | 33,928,928 |  |  | 79,545,023 |
Shares issued for vested restricted stock units |  | 321,965 |  |  | 125,863 |  |  | 196,102 |
Shares issued for vested performance stock units |  | 908,566 |  |  | 379,353 |  |  | 529,213 |
Stock appreciation rights exercised |  | 15,865 |  |  | 4,619 |  |  | 11,246 |
Treasury shares purchased |  | — |  |  | 1,766,826 |  |  | (1,766,826 | )
Outstanding, December 31, 2019 |  | 114,720,347 |  |  | 36,205,589 |  |  | 78,514,758 |
(a) The Company repurchases shares in connection with the issuance of shares under stock-based compensation programs and in accordance with Board authorized share repurchase programs.
Schedule of Earnings Per Share, Basic and Diluted | The following is a reconciliation of the average shares of common stock used to compute basic earnings per common share to the shares used to compute diluted earnings per common share as shown on the Consolidated Statements of Operations:
(In thousands, except per share data) |  | 2019 |  | 2018 |  | 2017
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders |  | $ | 28,231 |  |  | $ | 100,578 |  |  | $ | (6,810 | )
Weighted-average shares outstanding—basic |  | 79,632 |  |  | 80,716 |  |  | 80,553 |
Dilutive effect of stock-based compensation |  | 1,743 |  |  | 2,879 |  |  | — |
Weighted-average shares outstanding—diluted |  | 81,375 |  |  | 83,595 |  |  | 80,553 |
Income (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders:
Basic |  | $ | 0.35 |  |  | $ | 1.25 |  |  | $ | (0.08 | )
Diluted |  | $ | 0.35 |  |  | $ | 1.20 |  |  | $ | (0.08 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was antidilutive:
(In thousands) |  | 2019 |  | 2018 |  | 2017
Restricted stock units |  | — |  |  | — |  |  | 934 |
Stock options |  | — |  |  | — |  |  | 52 |
Stock appreciation rights |  | 491 |  |  | 306 |  |  | 1,737 |
Performance share units |  | 124 |  |  | — |  |  | 948 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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