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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Net income attributable to IPG Photonics Corporation $ 35,604 $ 57,253 $ 110,233 $ 184,684
Net income attributable to common stockholders $ 35,604 $ 57,253 $ 110,233 $ 184,684
Weighted average shares (in shares) 53,098 52,928 53,136 53,073
Dilutive effect of common stock equivalents (in shares) 566 694 555 791
Diluted weighted average common shares (in shares) 53,664 53,622 53,691 53,864
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share) $ 0.67 $ 1.08 $ 2.07 $ 3.48
Basic net income attributable to common stockholders (in dollars per share) 0.67 1.08 2.07 3.48
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share) 0.66 1.07 2.05 3.43
Diluted net income attributable to common stockholders (in dollars per share) $ 0.66 $ 1.07 $ 2.05 $ 3.43