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Condensed Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Net sales $ 345,585 $ 249,242
Cost of sales 181,594 146,366
Gross profit 163,991 102,876
Operating expenses:    
Sales and marketing 18,883 18,683
Research and development 33,339 31,838
General and administrative 30,092 27,124
(Gain) on foreign exchange (7,165) (19,565)
Total operating expenses 75,149 58,080
Operating income 88,842 44,796
Other (expense) income, net:    
Interest (expense) income, net (495) 3,073
Other income, net 253 191
Total other (expense) income (242) 3,264
Income before provision for income taxes 88,600 48,060
Provision for income taxes 20,378 11,294
Net income 68,222 36,766
Less: net income attributable to non-controlling interests 95 363
Net income attributable to IPG Photonics Corporation common stockholders $ 68,127 $ 36,403
Earnings Per Share [Abstract]    
Basic (in dollars per share) $ 1.27 $ 0.69
Diluted (in dollars per share) $ 1.26 $ 0.68
Weighted average common shares outstanding:    
Basic (in shares) 53,541 53,075
Diluted (in shares) 54,201 53,676