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Earnings (Loss) per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2015
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings (Loss) Per Share | The following table sets forth the computation of basic and diluted earnings (loss) per share (in thousands, except per share amounts):
| Year Ended December 31, |
| 2015 |  |  | 2014 |  |  | 2013 |
Numerators: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 35,628 |  |  | $ | (16,909 | ) |  | $ | 9,977 |
Consolidated loss from discontinued operations |  | (13 | ) |  |  | (7,333 | ) |  |  | (2,646 | )
Less: income attributable to noncontrolling interest |  | — |  |  |  | (10 | ) |  |  | (22 | )
Loss from discontinued operations attributable to GSI Group Inc. |  | (13 | ) |  |  | (7,343 | ) |  |  | (2,668 | )
Net income (loss) attributable to GSI Group Inc. | $ | 35,615 |  |  | $ | (24,252 | ) |  | $ | 7,309 |
Denominators: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding— basic |  | 34,579 |  |  |  | 34,352 |  |  |  | 34,073 |
Dilutive potential common shares (1) |  | 248 |  |  |  | — |  |  |  | 323 |
Weighted average common shares outstanding— diluted |  | 34,827 |  |  |  | 34,352 |  |  |  | 34,396 |
Antidilutive common shares excluded from above |  | — |  |  |  | 439 |  |  |  | 246 |
Basic Earnings (Loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations | $ | 1.03 |  |  | $ | (0.49 | ) |  | $ | 0.29 |
From discontinued operations | $ | (0.00 | ) |  | $ | (0.21 | ) |  | $ | (0.08 | )
Basic earnings (loss) per share attributable to GSI Group Inc. | $ | 1.03 |  |  | $ | (0.70 | ) |  | $ | 0.21 |
Diluted Earnings (Loss) per Common Share: |  |  |  |  |  |  |  |  |  |  |
From continuing operations | $ | 1.02 |  |  | $ | (0.49 | ) |  | $ | 0.29 |
From discontinued operations | $ | (0.00 | ) |  | $ | (0.21 | ) |  | $ | (0.08 | )
Diluted earnings (loss) per share attributable to GSI Group Inc. | $ | 1.02 |  |  | $ | (0.70 | ) |  | $ | 0.21 |
| (1) | Due to the Company’s net loss position for the year ended December 31, 2014, all potentially dilutive shares were excluded as their effect would have been anti-dilutive.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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