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Net Income Attributable to IPG Photonics Corporation Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Computation of Diluted Net Income Per Share
The following table sets forth the computation of diluted net income attributable to IPG Photonics Corporation per common share following the treasury stock method:
Three Months Ended March 31,
20212020
Net income attributable to IPG Photonics Corporation common stockholders$68,127 $36,403 
Basic weighted average common shares53,541 53,075 
Dilutive effect of common stock equivalents660 601 
Diluted weighted average common shares54,201 53,676 
Basic net income attributable to IPG Photonics Corporation per common share$1.27 $0.69 
Diluted net income attributable to IPG Photonics Corporation per common share$1.26 $0.68 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share The weighted average anti-dilutive shares outstanding for the three months ended March 31, 2021 and 2020 were as follows:
Three Months Ended March 31,
20212020
Non-qualified stock options202,500 622,700 
Restricted stock units61,100 198,000 
Performance stock units13,800 50,300 
Total weighed average anti-dilutive shares outstanding277,400 871,000