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Earnings (loss) per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Schedule of Computations of Basic and Diluted Earnings (Loss) per Share | The following table sets forth the computations of basic and diluted earnings per share:
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Basic income (loss) per share |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income (loss) attributable to Mistras Group, Inc. | $ | 3,380 |  |  | $ | 1,523 |  |  | $ | 3,955 |  |  | $ | (99,642) |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 29,619 |  |  | 29,177 |  |  | 29,550 |  |  | 29,086 |
Basic income (loss) per share | $ | 0.11 |  |  | $ | 0.05 |  |  | $ | 0.13 |  |  | $ | (3.43) |
Diluted income (loss) per share: |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income (loss) attributable to Mistras Group, Inc. | $ | 3,380 |  |  | $ | 1,523 |  |  | $ | 3,955 |  |  | $ | (99,642) |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 29,619 |  |  | 29,177 |  |  | 29,550 |  |  | 29,086 |
Dilutive effect of stock options outstanding | — |  |  | — |  |  | — |  |  | — |
Dilutive effect of restricted stock units outstanding (1) | 508 |  |  | 134 |  |  | 543 |  |  | — |
| 30,127 |  |  | 29,311 |  |  | 30,093 |  |  | 29,086 |
Diluted income (loss) per share | $ | 0.11 |  |  | $ | 0.05 |  |  | $ | 0.13 |  |  | $ | (3.43) |
_______________ (1) For the nine months ended September 30, 2020, 213,000 shares related to restricted stock were excluded from the calculation of diluted EPS due to the net loss for the period.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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