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Net Income Attributable To IPG Photonics Corporation Per Share (Anti Dilutive Shares Excluded From EPS) (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Excluded from computation of diluted weighted average common shares (in shares) | 562,700 | 981,800 | 628,200 | 786,200
Stock Options | Non-qualified Plan |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Excluded from computation of diluted weighted average common shares (in shares) | 528,300 | 763,000 | 555,800 | 578,000
Restricted Stock Units, RSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Excluded from computation of diluted weighted average common shares (in shares) | 28,900 | 167,200 | 36,200 | 149,200
Performance Stock Units, PSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Excluded from computation of diluted weighted average common shares (in shares) | 0 | 45,500 | 19,800 | 40,800
Employee Stock Purchase Plan, ESPP |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Excluded from computation of diluted weighted average common shares (in shares) | 5,500 | 6,100 | 16,400 | 18,200

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: 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=6371337&loc=d3e3550-109257 + Details
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