Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 1,314,581	$ 1,459,874	$ 1,408,889
Cost of sales	708,372	659,606	611,978
Gross profit	606,209	800,268	796,911
Operating expenses:
Sales and marketing	77,745	57,815	49,801
Research and development	129,997	122,769	100,870
General and administrative	107,597	102,429	80,668
Goodwill impairment	37,120	0	0
Impairment of long-lived assets and other restructuring charges	7,130	0	0
Loss (gain) on foreign exchange	12,827	(6,150)	14,460
Total operating expenses	372,416	276,863	245,799
Operating income	233,793	523,405	551,112
Other income, net:
Interest income, net	14,238	9,057	737
Other income, net	345	1,933	22
Total other income	14,583	10,990	759
Income before provision for income taxes	248,376	534,395	551,871
Provision for income taxes	68,115	130,226	204,283
Net income	180,261	404,169	347,588
Less: net income (loss) attributable to non-controlling interests	27	142	(26)
Net income attributable to IPG Photonics Corporation	$ 180,234	$ 404,027	$ 347,614
Net income attributable to IPG Photonics Corporation per share:
Basic (in dollars per share)	$ 3.40	$ 7.55	$ 6.50
Diluted (in dollars per share)	$ 3.35	$ 7.38	$ 6.36
Weighted average shares outstanding:
Basic (in shares)	53,061	53,522	53,495
Diluted (in shares)	53,839	54,726	54,699