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Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 404,169	$ 347,588	$ 260,716
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(85,590)	101,056	3,163
Foreign currency translation adjustments		100,999
Unrealized gain (loss) on derivatives	15	(58)	49
Effect of adopted accounting standards	10	0	0
Unrealized loss on available-for-sale investments	0	(240)	(298)
Loss on available-for-sale investments, net of tax reclassified to net income	0	538	0
Total other comprehensive (loss) income	(85,565)	101,239	2,914
Comprehensive income	318,604	448,827	263,630
Comprehensive gain (loss) attributable to noncontrolling interest	129	31	(21)
Comprehensive income attributable to IPG Photonics Corporation	$ 318,475	$ 448,796	$ 263,651

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