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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
NET SALES $ 1,459,874 $ 1,408,889 $ 1,006,173
COST OF SALES 659,606 611,978 453,933
GROSS PROFIT 800,268 796,911 552,240
OPERATING EXPENSES:      
Sales and marketing 57,815 49,801 38,393
Research and development 122,769 100,870 78,552
General and administrative 102,429 80,668 66,486
(Gain) loss on foreign exchange (6,150) 14,460 4,496
Total operating expenses 276,863 245,799 187,927
OPERATING INCOME 523,405 551,112 364,313
OTHER INCOME, Net:      
Interest income, net 9,057 737 1,304
Other income, net 1,933 22 948
Total other income 10,990 759 2,252
INCOME BEFORE PROVISION FOR INCOME TAXES 534,395 551,871 366,565
PROVISION FOR INCOME TAXES (130,226) (204,283) (105,849)
NET INCOME 404,169 347,588 260,716
LESS: NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS 142 (26) (36)
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION $ 404,027 $ 347,614 $ 260,752
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:      
Basic (in dollars per share) $ 7.55 $ 6.50 $ 4.91
Diluted (in dollars per share) $ 7.38 $ 6.36 $ 4.85
WEIGHTED AVERAGE SHARES OUTSTANDING:      
Basic (in shares) 53,522 53,495 53,068
Diluted (in shares) 54,726 54,699 53,797