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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, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net income attributable to IPG Photonics Corporation $ 74,945 $ 49,326
Weighted average shares (in shares) 53,368 52,898
Dilutive effect of common stock equivalents (in shares) 1,002 723
Diluted weighted average common shares (in shares) 54,370 53,621
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share) $ 1.40 $ 0.93
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share) $ 1.38 $ 0.92