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Net Income Attributable To IPG Photonics Corporation Per Share (Computation of Diluted Net Income) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to IPG Photonics Corporation | $ 100,517 | $ 115,597 | $ 328,468 | $ 294,658
Weighted average shares (in shares) | 53,571 | 53,440 | 53,677 | 53,453
Dilutive effect of common stock equivalents (in shares) | 1,125 | 1,258 | 1,318 | 1,117
Diluted weighted average common shares (in shares) | 54,696 | 54,698 | 54,995 | 54,570
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share) | $ 1.88 | $ 2.16 | $ 6.12 | $ 5.51
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share) | $ 1.84 | $ 2.11 | $ 5.97 | $ 5.40

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