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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of from Basic to Diluted Weighted Average Number of Shares Outstanding | The reconciliation from basic to diluted weighted average shares outstanding is as follows:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Weighted average shares outstanding – Basic |  | 133,336,352 |  |  | 104,096,837 |  |  | 133,237,653 |  |  | 104,020,180 |
Dilutive effect of unvested common shares and restricted stock units with service conditions and assumed stock option exercises and conversions |  | 1,239,810 |  |  | — |  |  | 985,975 |  |  | — |
Weighted average shares outstanding – Diluted |  | 134,576,162 |  |  | 104,096,837 |  |  | 134,223,628 |  |  | 104,020,180 |
Schedule of Earnings Per Share, Basic and Diluted | Basic and diluted earnings per share are calculated as follows:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |  |
Net income (loss) attributable to PQ Group Holdings Inc. |  | $ | 14,185 |  |  | $ | (3,345 | ) |  | $ | 30,181 |  |  | $ | (7,408 | )
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding – Basic |  | 133,336,352 |  |  | 104,096,837 |  |  | 133,237,653 |  |  | 104,020,180 |
Weighted average shares outstanding – Diluted |  | 134,576,162 |  |  | 104,096,837 |  |  | 134,223,628 |  |  | 104,020,180 |
Net income (loss) per share: |  |  |  |  |  |  |  |
Basic income (loss) per share |  | $ | 0.11 |  |  | $ | (0.03 | ) |  | $ | 0.23 |  |  | $ | (0.07 | )
Diluted income (loss) per share |  | $ | 0.11 |  |  | $ | (0.03 | ) |  | $ | 0.22 |  |  | $ | (0.07 | )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The table below presents the details of the Company’s equity-based awards outstanding at the end of each respective period that were excluded from the calculation of diluted earnings per share:
|  | September 30,
|  | 2018 |  | 2017
Restricted stock awards with performance only targets not yet achieved |  | 1,659,050 |  |  | 1,769,447 |
Stock options with performance only targets not yet achieved |  | 586,253 |  |  | 586,253 |
Anti-dilutive restricted stock awards and restricted stock units |  | — |  |  | 340,380 |
Anti-dilutive stock options |  | — |  |  | 1,539,266 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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