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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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