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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
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income attributable to IPG Photonics Corporation common stockholders $ 68,127 $ 36,403
Basic weighted average common shares 53,541 53,075
Dilutive effect of common stock equivalents (in shares) 660 601
Diluted weighted average common shares 54,201 53,676
Basic net income attributable to IPG Photonics Corporation per common share (in dollars per share) $ 1.27 $ 0.69
Diluted net income attributable to IPG Photonics Corporation per common share (in dollars per share) $ 1.26 $ 0.68