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Earnings Per Common Share | 6 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share Earnings per common share (“EPS”) attributable to IDEX is computed by dividing net income attributable to IDEX by the weighted average number of shares of common stock (basic) plus common stock equivalents outstanding (diluted) during the period. Common stock equivalents consist of stock options, which have been included in the calculation of weighted average shares outstanding using the treasury stock method, restricted stock and performance share units. ASC 260, Earnings Per Share, concludes that all outstanding unvested share-based payment awards that contain rights to nonforfeitable dividends participate in undistributed earnings with common shareholders. If awards are considered participating securities, the Company is required to apply the two-class method of computing basic and diluted earnings per share. The Company has determined that its outstanding shares of restricted stock are participating securities. Accordingly, EPS attributable to IDEX was computed using the two-class method prescribed by ASC 260. Basic weighted average shares outstanding reconciles to diluted weighted average shares outstanding as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Basic weighted average common shares outstanding | 75,968 |  |  | 75,171 |  |  | 75,930 |  |  | 75,459 |
Dilutive effect of stock options, restricted stock and performance share units | 461 |  |  | 766 |  |  | 455 |  |  | 739 |
Diluted weighted average common shares outstanding | 76,429 |  |  | 75,937 |  |  | 76,385 |  |  | 76,198 |
Options to purchase approximately 0.3 million and 0.6 million shares of common stock for the three months ended June 30, 2021 and 2020, respectively, and 0.3 million and 0.6 million shares of common stock for the six months ended June 30, 2021 and 2020, respectively, were not included in the computation of diluted EPS because the effect of their inclusion would have been antidilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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