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Capital Stock (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock |  |  |  |
Shares outstanding at the beginning of the period | 114,720,347 | 113,473,951 | 112,888,126 | 112,499,874
Treasury stock, shares | 36,205,589 | 33,928,928 | 32,434,274 | 32,324,911
Common Stock, Shares, Outstanding | 78,514,758 | 79,545,023 | 80,453,852 | 80,174,963
Vested Restricted Stock Units (in shares) | 321,965 | 545,908 | 375,355 |
Stock Issued During Period, Shares, Other | 908,566 |  |  |
Stock issued during period, stock appreciation rights (in shares) | 15,865 | 39,917 | 12,897 |
Treasury shares purchased | 0 | 0 |  |
Shares outstanding at the end of the period | 114,720,347 | 113,473,951 | 112,888,126 |
Treasury Stock, Shares | 36,205,589 | 33,928,928 | 32,434,274 |
Common Stock, Shares, Outstanding | 78,514,758 | 79,545,023 | 80,453,852 |
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 |  |  |  |
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders (in dollars) | $ 28,231 | $ 100,578 | $ (6,810) |
Weighted average shares of common stock outstanding | 79,632,000 | 80,716,000 | 80,553,000 |
Dilutive effect of stock-based compensation (in shares) | 1,743,000 | 2,879,000 | 0 |
Weighted-average shares outstanding—diluted (in shares) | 81,375,000 | 83,595,000 | 80,553,000 |
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: |  |  |  |
Basic (in dollars per share) | $ 0.35 | $ 1.25 | $ (0.08) |
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.35 | $ 1.20 | $ (0.08) |
Treasury Stock |  |  |  |
Common Stock |  |  |  |
Vested Restricted Stock Units (in shares) | 125,863 | 161,774 | 105,431 |
Stock Issued During Period, Shares, Other | 379,353 |  |  |
Stock issued during period, stock appreciation rights (in shares) | 4,619 | 11,808 | 3,932 |
Treasury shares purchased | 1,766,826 | 1,321,072 | 0 |
Outstanding Shares |  |  |  |
Common Stock |  |  |  |
Vested Restricted Stock Units (in shares) | 196,102 | 384,134 | 269,924 |
Stock Issued During Period, Shares, Other | 529,213 |  |  |
Stock issued during period, stock appreciation rights (in shares) | 11,246 | 28,109 | 8,965 |
Treasury shares purchased | 1,766,826 | 1,321,072 |  |

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