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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 100,752	$ 115,597	$ 328,703	$ 294,632
Other comprehensive income, net of tax:
Translation adjustments	(15,047)	29,855	(67,072)	89,076
Unrealized loss on derivatives, net of tax	(5)	11	(3)	(35)
Effect of adopted accounting standards	0	0	10	0
Available-for-sale investments, net of tax, reclassified to net income	0	0	0	298
Total other comprehensive (loss) income	(15,052)	29,866	(67,065)	89,339
Comprehensive income	85,700	145,463	261,638	383,971
Comprehensive income (loss) attributable to noncontrolling interests	196	0	196	(26)
Comprehensive income attributable to IPG Photonics Corporation	$ 85,504	$ 145,463	$ 261,442	$ 383,997

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