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Earnings per Share
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Earnings per Share Earnings per Share
 
Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the sum of (i) the weighted average number of shares of common stock outstanding during the period and (ii) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted average shares outstanding (denominator), diluted shares reflects: (i) the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common stock during the period and (ii) the pro forma vesting of restricted stock units.
 
The following table sets forth the computations of basic and diluted earnings (loss) per share (in thousands except share data):
 For the year ended December 31,
 202220212020
Basic earnings (loss) per share:
Numerator:
Net income (loss) attributable to Mistras Group, Inc.$6,499 $3,860 $(99,461)
Denominator
Weighted average common shares outstanding29,901 29,572 29,147 
Basic earnings (loss) per share$0.22 $0.13 $(3.41)
Diluted earnings (loss) per share:
Numerator:
Net income (loss) attributable to Mistras Group, Inc.$6,499 $3,860 $(99,461)
Denominator
Weighted average common shares outstanding29,901 29,572 29,147 
Dilutive effect of stock options outstanding— 558 — 
Dilutive effect of restricted stock units outstanding328 — — 
 30,229 30,130 29,147 
Diluted earnings (loss) per share$0.21 $0.13 $(3.41)
 
The following potential common stock were excluded from the computation of diluted earnings per share, as the effect would have been anti-dilutive:
 For the year ended December 31,
 202220212020
Potential common stock attributable to restricted stock units (RSUs) and performance stock units (PSUs) outstanding (1)
1,005 109 790 
Potential common stock attributable to stock options outstanding1 5 5 
Total1,006 114 795 

 (1) For the year ended December 31, 2020, 254 shares related to RSUs/PSUs, were excluded from the calculation of diluted EPS due to the net loss for the period.