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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