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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2018
Selected Quarterly Financial Information [Abstract]  
Selected Quarterly Financial Data (Unaudited) SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
2018
First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
Net sales$359,864 $413,613 $356,346 $330,051 
Gross profit203,362 234,975 195,184 166,747 
Net income attributable to IPG Photonics Corporation106,334 121,617 100,517 75,559 
Basic earnings per share1.98 2.27 1.88 1.42 
Diluted earnings per share1.93 2.21 1.84 1.40 

2017
First
Quarter
Second
Quarter
Third
Quarter
Fourth
Quarter
Net sales$285,846 $369,373 $392,615 $361,055 
Gross profit157,267 206,296 224,555 208,793 
Net income attributable to IPG Photonics Corporation74,945 104,116 115,597 52,956 
Basic earnings per share1.40 1.95 2.16 0.99 
Diluted earnings per share1.38 1.91 2.11 0.96 
Net income attributable to IPG Photonics Corporation as well as basic and diluted earnings per share in the fourth quarter of the year ended December 31, 2017 were impacted by the legislation that enacted the Tax Act. Refer to Note 14 for further explanation.