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Net Income Attributable To IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares (in shares)	30,880	16,104	60,797
Authorized amount	$ 125,000,000
Shares repurchased (in shares)	1,051,825	275,495	102,774
Shares repurchased, average cost per share (in dollars per share)	$ 167.39	$ 145.15	$ 87.01
Weighted average number of treasury shares (in shares)	363,936	160,440	20,935
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares (in shares)	19,370	10,724	12,711
Performance Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares (in shares)	6,310	0	809

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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