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Capital Stock (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Common Stock |  |  |  |
Shares outstanding at the beginning of the period | 112,063,938 | 111,931,267 | 111,611,102 | 111,387,185
Treasury Stock, Number of Shares Held | 31,479,310 | 31,454,097 | 31,097,043 | 31,034,126
Common Stock, Shares, Outstanding | 80,584,628 | 80,477,170 | 80,514,059 | 80,353,059
Stock Options Exercised (in shares) | 38,900 | 199,032 | 115,493 |
Vested Restricted Stock Units (in shares) | 45,898 | 121,133 | 108,424 |
Treasury shares purchased (in shares) | 0 | 286,577 | 0 |
Other Stock Grants (in shares) | 47,873 |  |  |
Shares outstanding at the end of the period | 112,063,938 | 111,931,267 | 111,611,102 | 111,387,185
Treasury Stock, Number of Shares Held | 31,479,310 | 31,454,097 | 31,097,043 | 31,034,126
Common Stock, Shares, Outstanding | 80,584,628 | 80,477,170 | 80,514,059 | 80,353,059
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) | $ (253,693) | $ (9,447) | $ 10,885 |
Weighted average number of shares outstanding - basic | 80,632,000 | 80,736,000 | 80,569,000 |
Dilutive effect of stock-based compensation (in shares) | 0 | 0 | 192,000 |
Weighted average number of shares outstanding - diluted | 80,632,000 | 80,736,000 | 80,761,000 |
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: |  |  |  |
Basic (in dollars per share) | $ (3.15) | $ (0.12) | $ 0.14 |
Diluted (in dollars per share) | $ (3.15) | $ (0.12) | $ 0.13 |
Common Stock Treasury |  |  |  |
Common Stock |  |  |  |
Stock Options Exercised (in shares) | 0 | 41,974 | 24,008 |
Vested Restricted Stock Units (in shares) | 14,677 | 28,503 | 38,909 |
Treasury shares purchased (in shares) | 286,577 |  |  |
Other Stock Grants (in shares) | 10,536 |  |  |
Outstanding Shares |  |  |  |
Common Stock |  |  |  |
Stock Options Exercised (in shares) | 38,900 | 157,058 | 91,485 |
Vested Restricted Stock Units (in shares) | 31,221 | 92,630 | 69,515 |
Treasury shares purchased (in shares) | (286,577) |  |  |
Other Stock Grants (in shares) | 37,337 |  |  |

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