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Capital Stock (Tables) | 12 Months Ended
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Dec. 31, 2012
Equity [Abstract] |
Schedule of Share Repurchases | The Board of Directors has authorized the repurchase of shares of common stock as follows:
|  | Shares Authorized to be Purchased January 1 |  | Additional Shares Authorized for Purchase |  | Shares Purchased |  | Remaining Shares Authorized for Purchase December 31
2010 |  | 2,000,000 |  |  | — |  |  | — |  |  | 2,000,000 |
2011 |  | 2,000,000 |  |  | — |  |  | 286,577 |  |  | 1,713,423 |
2012 |  | 1,713,423 |  |  | — |  |  | — |  |  | 1,713,423 |
Schedule of Common Stock Outstanding Roll Forward | The following table summarizes the Company's common stock:
|  | Common Stock
|  | Shares Issued |  | Treasury Shares |  | Outstanding Shares
Outstanding, January 1, 2010 |  | 111,387,185 |  |  | 31,034,126 |  |  | 80,353,059 |
Stock Options Exercised |  | 115,493 |  |  | 24,008 |  |  | 91,485 |
Vested Restricted Stock Units |  | 108,424 |  |  | 38,909 |  |  | 69,515 |
Outstanding, December 31, 2010 |  | 111,611,102 |  |  | 31,097,043 |  |  | 80,514,059 |
Stock Options Exercised |  | 199,032 |  |  | 41,974 |  |  | 157,058 |
Vested Restricted Stock Units |  | 121,133 |  |  | 28,503 |  |  | 92,630 |
Treasury Shares Purchased |  | — |  |  | 286,577 |  |  | (286,577 | )
Outstanding, December 31, 2011 |  | 111,931,267 |  |  | 31,454,097 |  |  | 80,477,170 |
Stock Options Exercised |  | 38,900 |  |  | — |  |  | 38,900 |
Vested Restricted Stock Units |  | 45,898 |  |  | 14,677 |  |  | 31,221 |
Other Stock Grants |  | 47,873 |  |  | 10,536 |  |  | 37,337 |
Outstanding, December 31, 2012 |  | 112,063,938 |  |  | 31,479,310 |  |  | 80,584,628 |
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 in the Consolidated Statements of Operations:
(Amounts in thousands, except per share data) |  | 2012 |  | 2011 |  | 2010
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders |  | $ | (253,693 | ) |  | $ | (9,447 | ) |  | $ | 10,885 |
Weighted-average shares outstanding—basic |  | 80,632 |  |  | 80,736 |  |  | 80,569 |
Dilutive effect of stock-based compensation |  | — |  |  | — |  |  | 192 |
Weighted-average shares outstanding—diluted |  | 80,632 |  |  | 80,736 |  |  | 80,761 |
Earnings (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: |  |  |  |  |  |
Basic |  | $ | (3.15 | ) |  | $ | (0.12 | ) |  | $ | 0.14 |
Diluted |  | $ | (3.15 | ) |  | $ | (0.12 | ) |  | $ | 0.13 |
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) |  | 2012 |  | 2011 |  | 2010
Restricted stock units |  | 148 |  |  | 64 |  |  | 9 |
Stock options |  | 389 |  |  | 755 |  |  | — |
Stock appreciation rights |  | 530 |  |  | — |  |  | — |
Other stock-based compensation units |  | 317 |  |  | 554 |  |  | — |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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