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Net Income Attributable To IPG Photonics Corporation Per Share (Tables)
 9 Months Ended
Sep. 30, 2020
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 share:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Net income attributable to IPG Photonics Corporation$35,604 $57,253 $110,233 $184,684 
Net income attributable to common stockholders35,604 57,253 110,233 184,684 
Weighted average shares53,098 52,928 53,136 53,073 
Dilutive effect of common stock equivalents566 694 555 791 
Diluted weighted average common shares53,664 53,622 53,691 53,864 
Basic net income attributable to IPG Photonics Corporation per share$0.67 $1.08 $2.07 $3.48 
Basic net income attributable to common stockholders$0.67 $1.08 $2.07 $3.48 
Diluted net income attributable to IPG Photonics Corporation per share$0.66 $1.07 $2.05 $3.43 
Diluted net income attributable to common stockholders$0.66 $1.07 $2.05 $3.43 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share The weighted average anti-dilutive shares outstanding for the three and nine months ended September 30, 2020 and 2019 were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Non-qualified stock options528,300 763,000 555,800 578,000 
Restricted stock units28,900 167,200 36,200 149,200 
Performance stock units— 45,500 19,800 40,800 
Employee stock purchase plan5,500 6,100 16,400 18,200 
Total weighed average anti-dilutive shares outstanding562,700 981,800 628,200 786,200