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Selected Quarterly Financial Data (Components Of Selected Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
NET SALES	$ 330,051	$ 356,346	$ 413,613	$ 359,864	$ 361,055	$ 392,615	$ 369,373	$ 285,846	$ 1,459,874	$ 1,408,889	$ 1,006,173
Gross profit	166,747	195,184	234,975	203,362	208,793	224,555	206,296	157,267	800,268	796,911	552,240
Net income attributable to IPG Photonics Corporation	$ 75,559	$ 100,517	$ 121,617	$ 106,334	$ 52,956	$ 115,597	$ 104,116	$ 74,945	$ 404,027	$ 347,614	$ 260,752
Basic (in dollars per share)	$ 1.42	$ 1.88	$ 2.27	$ 1.98	$ 0.99	$ 2.16	$ 1.95	$ 1.40	$ 7.55	$ 6.50	$ 4.91
Diluted (in dollars per share)	$ 1.40	$ 1.84	$ 2.21	$ 1.93	$ 0.96	$ 2.11	$ 1.91	$ 1.38	$ 7.38	$ 6.36	$ 4.85

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